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Release the sspring valve retainer compressor and remove re move the valve spring va lve sspring pring l , Remove the valve I , retainer 3 valve stem oil seals seals 4 4 and valve spring seats 5. Re move any carbon car bon from the 5. Remove r emoved from valve stems before they are a r e removed the cylinder head. Drive the intake valve gu guide exhaustt 9 down through valve guide 9 throu h the head using an arbor. Remove the intake valves 6 e x 6 and the ex2. Remove haust valves 7 from the cylinder head 13 7 13 and set them in a rack rac k or holder.
T Too remove the cup plugs 11 11 a nd pryed out. The exha ust valve sca ts 10 re4. The exhaust seats 10 can be rewith a special ial seat removing tool, moved w Inset B. NOTE : Never ttempt to remove ever aattempt a valve seat with a center punch, cold chisel or pry bar. Press the guides into the head from the top of the head. The guides must protrude above cylinder head. To install new exhaust valve seats 10 lea n the recess in the cylinder h head.
Invalve seats in dry Ice ice to shrin shrink sert the valve seats in the head and press them in place, using a suitable press.
Lubricate the intake valves 6 a nd exh a ust 6 and exhaust 3. Lubricate valves 7 7 with wi th clean eengine ngine oil and install. Install the valve Z ,, valve springs 1 , the valve valve retainers reta iners 3. Compress the valve springs so so tthe h e valve stem stern seals 4 4 can be installed in the lowe lowerr grooves Insta ll the valve retainer re tainer of the valve stems.
Install locks 2 2. Remove the spring compressor ccarefully. The flush with the top of the cylinder head. ReRe Clean the cylinder head complete completely. Check the head [or for evidence of of warpage.
If warpago warpage exists and is more tha warpage. Use a Val ve Spring Tester spring pressure. I llO 1. Valve cann usi ng a bore gauge be checked or for wea wearr by using and micrometer, re fer to Figure Fi gure 10, 10, Inset A. If the dia diametw greater wear, Figure Use aan ide diam eter of va lve gguide uide to to the ins inside diameter of the valve uide from colla psing when pressed keep the gguide collapsing into re ss in from the trip top of the head info place.
Replacement guides Figure 9, must m ust be reamed rE'amed after installation ins ta llati on. Ream the. Clea powe r driven fine fine Cleann the valves with a power wire bru sh, being very careful not to scratch brush, the valve stE'ms. F igure "H II for valve va lve stems.
RE'fer Refer to Figure nomencla ture. This ca cann be caused necked steins, by lack of ion, plugged water paspasof lubricat lubrication, sages ting the eengine ngine under contin sages or opera operating contin-o uous overload aatt excess ive engi ne RPM.
Reexcessive engine Res ts. Inspect the valves for deep grooves in the fac e, Figure 1. This can caused face. If rust rus t or pitti ng on the valve stem stem exis ts , replace repla ce the vvalve. These conditions exists, ca n be caused by using usi ng poor qua lity eng ine quality engine can fuel specificoil or fu el that tha t does not meet the specifIc' aation tion given in Section 11 11 and by improper engine.
This condition is usually caused by worn piston rings and sleeves which allow a llow too much oil to reach the comcombustion chamber. Low oper a ting temperature templ? Inspec t the vaivcj va lve head Kir tor dishing and Inspect and the va lve face face for deep burned spots, Figure The vdlves "a lves must be regri nding tthe grinding h e val valves.
These conditlon conditionbs are a rp usually usua lly caused excessive loads by running runnin g the t he engine under undcr excessive at ng ine temperatures, tempera tures, a t high eengine.
Figure 17 The checki ng of lve stem diameter checking of the va valve ca n be be best be done with a good, good, accurate acc urate can micrometer, micrometer , Figure The valve stem s tem being straight, should be measured meas ured at three igure If the wear is greater greater,, repla replace surem ent. If ce the valve. The check ing of the valve fa ce runou! A Vee block type holder wi th a dia l Indicator , Figure 19 can be used to c heck the va lve face and stem runout.
The valve face runau t should not exceed more tha n. If the valve face and i or val ve stem runout is greater, the valve m ust be reo placed. I OTE : Sma ll amounts Of ' -ery line pitting, Figure 20, may b found on the s urfaces of the va lves faces a nd seats afler Ille va lves a re cleaned. These are normal a nd wil l not affect engine perrOtma nce. This fine pitting Is c aused by a norma l oxid ation process and can happen on any engine eluring the r un- in peri od. It Is not necessa ry to grind val 'es or seats if Lhis fin e pitting is found a s thE' pitting will generally reoccur after the en gine is run for a few hours.
A wire br ush ed, cleaned and inspected. A 44" angle is the correct valve face grinding angle. Set the refacing machine protractor a t this Set t he refacing machine pro trac tor at this angle. Be s u r e the chuck of the machine is a ngl e. Be sure the chuck of the m achine is clean before installing the valve. Dress the c lean before installing the va lve.
Dress the grinding wheel before starting to reface the grinding wheel before starting to reface the valves. Take only light cuts as a s tthe valve is val ves. Take only lig ht cuts he val ve' is refaced. The last cut must be very fine so r efa ced.
The l ast cu t must be very fine so the valve face will have a polished finish, the va lve face w ill have a polished fini sh. If the margin on the ground valve is less than half margin on th e ground va lve is l ess than half the margin on a new valve, replace the valve. Correct refacing of intake and exhaust Correct refacing of i ntake and ex haus t valves and valve s e a t s will provide a l h inval ves and va lve sea ts will provide a 10 Interference angle.
This angle is important terference angle. Thi s angle is importan t since it aids in cutting carbon and helps seat since it aids in cutting carbon and helps seat the valves. Figure 21 The tip end of the valve should be checked The tip end of the valve shou ld be checked for roughness o r wear.
Usually this c a n be fo r roughness or wear. Never grind off the valve s t e m up the end. Never grind off the valve stem end beyond the chamfer. Figure 22 When the top edge of the contact a r e a is When the top edge of the con tact area is too high o r low on the valve face, the s e a t too hig h or Iowan the valve face, the seat contact area must be moved. This is done contact area must be moved.
This is done by using the narrowing stones. Refer to by using the narrow ing stones. Refer to P a g e 15, The contact area width should Page The contact area width sho uld never exceed the specified dimension of never exceed the speci fied dimension of. Take Always ve ry light ccuts uts with the ggrinding r inding stones so very just eenough noug h metal is removed rem oved to end up with just mooth sca finish. The proper angle of grind is 45" ex for exva lve seats, Fig ure The valve va lve sea ontac t area width wi dth and 10 seatt ccontact Iocation ccan a n be cha nged by using usi ng the " changed.
NT:: The va lve seat runou t wive runout sshould hould be checked after finish grinding with aa ddial ial indicator aand nd SE? The run out of the valve va lvE' seat must m ust The runout xceed. No'rE: valvE' hea recE'ded more morc E: If If the valveheadd hhas a s receded e xhaus t valve and intak intake valve valve bebe than.
Figure Ch eck and adjust the followin va lve clearChock followsngg valve ances ; int akC' valve at. STEP 2 -- Cra nk tthe plete reCrank h e engine one com complete revvolution olutio n and align the timing pointer and tthe he TDe fl y wheel. Figure Fig ure CylTDC mar m a r k on the fivwheel. Checkk aand ollowing valve clearclearChec nd adjust the ffollowing ances; intake inta k e valves a t.
The tappet cclearances o r hot settings are take valves and. Insufficien nce would all ow the valve emain open and be burned by the hot exhaust exhau st Insufficientt cleara clearbance allow valvess to rremain ga ses.
Jd ," Head and Springs Installed a nd Reamed Length and In sta lle d and Reamed Maxim um Limit Incl uding Wear 3. Com pressed to 1. Shaft Spring and 1. Engine oil, camshaft metering. Shaft Oil Holes Toward valve side of engin. Shaft c annot be r otated. Cylinder Head S tud Nuts and Valve Cover Stud Nuts " Spark P lugs Clean the engine thoroughly , preferably by steam cleaning. Before cranking the e ng ine for compress ion checking , make sure all operating controls are in neutra l, brakes are set and the wheels are securely blocked.
Wh e n using the remote control type of compression tester, F igure I, make sure the wires are correc tly a ttached to the s tarter termina ls. Incorrec t attac hing of wires will ca use damage to the testing equipme nt , Figure 1. When using the ignition switch operation. Only the cranking method is advised to be used when c hecking compress io n pressure. NOTE : The e ngine must be at ope rating tempera t ure at the time of compression checking.
With the engine at opera ti ng tempera ture, shut the eng ine off. Close the fuel needle va lve at the fu el rank. This will prevent e xcessive fu el from e nte r ing the cylinder a nd wa s hing of the cylinder walls. Dis connect a ll high tension spark plug wires. Remove all spark plugs to provide minimum loa d on the starting m otor and battery. Drain the ca rburetor to prevent fue l fr om e ntering the cylinders. Check the compression pressure, using a reliable gauge and suitable a dapter to fit in a 18 mm t hread plug hole.
Two common ty pes of compression gauge equipment used are the remote control and the ignition switch ope ration type. Figure 2 7. It is very important that all cylinder pressures be approximately alike.
For the allowable compression pressure variation, refer to the chart on Page 5. If the compression reading is below these fi g ures, leaking val ves or excessive ring clea rance is indicated. NOTE: To make a simple c heck when a compr eSSion leak Is indicated, squirt a small amount a te aspoon of oil into the cylinder and recheck the compression.
If the p ress ure ri ses to near no rmal, compression loss is p ast the rings. Very little c hange in compression indicates le akage past the valves. A low pressure r eading will ca use difficulty in starting particula rly at low temperatures.
NOTE: Always ta ke a second set of readings for an accurate c hec k. This will also ind icate how much the loss of cra nking speed, due to ba ttery disc harge , is affecting the compress ion pressure reading. Replace them if necessa ry. Regap all p lugs to. Replace a ll spark plug g askets, Figure 3, before installing for proper sea ting and sealing. Install the spa rk plugs finge r tight. Using the exact size s pa rk plug w 'ench 01' a thin wall deep socket , torque the s park plugs 32 to 35 [t o Ibs.
St eam clea n the entire engine area whe re se rvice works is to be performed. Disconnec t a nd remove the a ir cleaner system. Loosen th e cap to the first stop carefully to relieve any exc ess pressu. Remove the hose from the the the rm ostat housin g I. Remove the therm osta t housing 1 a nd gaske l 2. Remove the bolts that c on nect the inta ke manifold 7 10 the exhaust manifo ld 8.
Remove th e valve cover 10 , gaske t 11 and breather tube Disc a rd the gasket. Remove the roc ke r arm brac ke t bolts 13 and th e stud nu t, RemQve th e roc ker arm assembly See Page 14 and 15 for. Disconnect the lin kage and fue l lines from.
Remove t h e carbure tor assembly 3 and gasket 4. DI scard the g asket. Di sconnect the hi gh tension wires from th e spark plugs and r emove the spark plugs 5 and g askets 0. Remove the c ylin der head stud nuts 1 6 a nd the c yl inde r head Remove the c ylinde r head gaske t 18 a nd discard the gasket. Clea n the top surface of the cylinder block a nd sleeve flange ca refully. Tlw top of the pistons may be c leaned with a powe r driven wire brush.
During cleaning , th e use of a clean lint fr ee c loth dampe ned In solvent is r e commende d. Clea n all bolt a nd slud threads. Cle an and ins pect the cyli nde r hea ds thoroughly. In spe ct the push r ods [or straightness , c ra cked or worn end s. Repla ce if necessa ry. Clean the valve cover a nd fl usll au! Clea n and check the s park pl ugs. If replacem ent is required, r cga p the spark plugs to. Install new cylind er hea d gasket 18 with the TOP mark up. Install the cylinder head 17 and stud nuts 16 , tighten the stud nut s 16 finger tight.
Install new intak e and ex haust manifold gasket 9. Torque the e xhaust manifold and intake manifold stud nuts 25 - 30 ft. Torque the thermostat housing stud nuts 20 - 25 ft.
Coat the push rods 15 with c lean engine oil. Insta ll the rocker arm assembly Make sure all of the push rods 15 are engaged with the a djus ting screws on the rocker arms.
Torque the mounting bolts 13 and stud nuts 14 25 - 30 ft. Adjust the valve tappet clearance, refer to. Page Install the e xhaust stack 21 and new gasket 20 , if it was removed. Torque the mounting bolts 3'1 to 42 ft. Recon nect the linkage and fuel line to the carburetor. Reinstall the air cleaner system making sure all connections are tight.
Install the spark plugs 5 with new gaskets 6 and torque 32 - 35 ft. Reco nnect all of the hig h tension wires to the spark plugs. Apply clean e ngine oil to the rocker arm assembly and start the engine. Check that the rocker arms are receiving lub r icating oil. Opera te the engine for approximately one hour, under load if possible to thoroughly warm up the e ngine and seat the heacl gaskets.
Shut the e ngine off. Recheck the torque to make sure all stud nuts have retained their proper torque. Recheck the rocker arm stud nuts and mounting bolts to make sure they have retained the 25 ft.
Install a new valve cover gasket 11 and valve cover Torque the cover nuts 5 to 8 ft. Install the breather tube Steam clea n the enti re engine area where ser vice wOl'k is to be pe rform ed. Disconnect and remove the a ir cleaner system. L Drain the cooli ng system.
Loo se n the cap to the first stop carefully to r e li 'v ' a ny excess pre ssure before removing it completely. Re move the hose from the the the rmos tat hous ing I. Remove the thermostat housing 1 and gaske t 2. Disca rd the g asket. Disconnect the linkage a nd fuel lines from the carburetor 3.
Remove the carburetor assembly 3 and gasket 4. Di sca rd the gasket. Disconnect the hig h tension wires from the spa r k plugs a nd remove the s pa rk plugs 5 and gasket" 6. Remove the bolts tha t connect the in take manifold 7 to the exhaust manifold 8. Re move the in ta ke manifold 7 and exhaust manifold 8. Remove m anjfold gasket 9 and discard. Remove the valve cover 10 , gasket 11 and b reather tu be Disca rd the g as ket.
Remove the rocker arm bracket bolts Remove th e roc ker arm assembly See P a ge 16 a nd 17 for servicing of the rocker a rm assembly. Remove the push rods l, and tag them so they can be installed in th eir prope l' locat ion when reassembling.
Remo ve the cylinder head s tud nuts 16 and the cylinde r head Remo ve the cylinder head gasket 18 a nd discard the gasket. Clea n the lop surface of the cy linder block a nd sleeve flange care full y.
The top of the pistons may be clean ed with a power driven wire brush. All traces of 'a r bon and other de posits mu s t be r e moved. Duri ng cleaning. Clean a ll bolt and stud threa ds. Clean and ins pect the cyl inder heads thor oughly.
If evidence o f fre tti ng or erosion e xists or if the hea d is warped more tha n. Inspect the pu sh rods for stra ig htnes s, c racked or worn e nd s. Clean the valve cover and flush out the breather tube. Clean and check the spark plugs. If repla ce m ent is required, r egap the spa rk plugs to. Install the cylinder hear! Ins ta ll the c ar buretor 3 with a new gasket 4 to the in ta ke manifold 7. Torque the. Reconnect the linka ge and fuel line to the c a rburetor.
Reconnect the hose to the thermostat housing. Ins tall new intake and exhaust manifold gasket 9. In s tall t. Insta ll the the rmostat housing Il and new. Mcke sure the drain valves are close d and refill the c ooling system. Reinstall the air cleaner s y ste m m a king su re all connections are tigh t. In s tall the spark plugs 5 wi th new gasket s 6 and torq ue 32 - 35 ft. Reconnect all of t he high tens ion wires to the spark plugs.
Apply clean engine oil to the rocker arm assembly and start the engine. Check tha t the roc ke r a rms are recei ving lubricating oil. Opera te the engine for approxlma te ly one hour, under load if possible to thorough ly warm up the e ngine and seat the head gaskets. Torque the thermo sta t housi ng stud nuts Torque t he m ounting boits U ft. Recheck the torque to make sure a ll flanged nu ts have ret;Jined their proper torque.
Rechec k the rocker arm bolts to make su re they have reta ined the ft. Ins tall the r oc ke r arm assem b ly Make sure all u t the push r ods 15 are engaged. In s tall the brea the r tube Hem ove. R em ove the shaft sprin gs 8 and s pacers 11 from the sha fts 5. T ag the fro nt and rear shafts. Inspection Check the s haH s prings for da mage and pro pel' tensio n. Compressed to 11 ". The roc ker arm mus t be ft'ee on the shaH without a ny s ide wob ble.
Inset A , to insure free oil flow. Inspect t hE' valve stem contact area on the rocker arm for wea I'. Replace if. Flu sh the s haft s to r emove any residual m ater ial.
Inspect the s halts for e xcessive wear or worn spells on thE' bo ttom side of the s haft. Replace the sh aft if any of these condition s exists. In spec t the rocker a rms by in st alling each r ocker ann on the shafts in its proper loca tion. Clea n and check the o il passage in the tappet Ins pect the push ['ods for straightness, cracke d or worn ends, r e place if these conditions exis t. Clean and c heck the oil passage in the cen ter rocke r arm bracket, Inset B.
Assembly Wit h all component parts c lea ned thoroughly and worn parts replacE'd. Insta ll t hE' pl ugs 3 in to the ou te r ends of the s halts 5 , if they were r emoveel , to a. NOTE : If the pl ugs 3 are installed too far they will block the flow at oil to one or more roc ker a rms.
Inst a ll t he e nd bracket s 2 part wayan the shafts 5 so the retaining pins 4 ca n be installed in s haft. Tap the end brackets further on the shafts so the pi n engages the s lot in the bracket and the oil holes in the sha ft are toward the valve side of the bracket. Starting with the front s haft install a r ear r ocker arm 7 , spri ng 8 , fron t rocker arm. Starling wit h the rear sha tt insta ll a fro nt rocker a rm 6 , spring 8 , r ea r roc ker arm 7.
Install t he push rods in thei r proper location. Ins tall the r oc ker arm as sembly to the cyl ind er head with th e bracket bol ts 1 and stud s 9. Torque the bracket boIlS a nd stud nuts 25 30 t t. Adjust the tappets, re fer to Page Remove cac h tappet adj usting screw ea ch r ocker orm , r!? Inspection Cheek Ihe sl1a ft spr ings for damage and proper te nsion. Wire Diam e ler Flush Ihe s haft s to remove a ny residual mat e rial. InspC'c l Ihe shafts [or e xcess ive wea r or worn spots on Ihe boltom sid e of the s ha ft.
Replace the shaft if any of these conditions exist. Inspect th C' r oc ke r arms by installing each. The rocker arm must be frce on the shaft without any side wol;Jblc.
Inspect the valve ste m contact area on the rocker arm for wear. Replace if worn. Clean a nd check the oil passage in the tappet adjusting screws, Inse t A, and the center ,I rack.
Inspect the push rods for st raightness. Assembly With all compone nt pa rts cleaned thoroughly a nd worn parts r eplaced, coat them with clean engine oil. In s ta ll the inte rm edia te bracke ts 10 on the 5. Insta ll the center bra c ket 11 to Ihe long shafts 8. The end from the cut-out of the shafts 8. In front s ha ft is installed wi t h t he s hort end of s tall the front 12 a nd r ea l'.
The rea r shaft is installed wilh the shar i end o f the sha ft from 6. Before installing the rocker ann asse mbly the cut out loward the r ea r of the e ng ine. Inse rt Ihe brac kel bolt 9 inlo the inter approximately 1 to 3 minutes until oil apmediate bracket 10 it musl line up with pears at the center oil passage in t he head, Ihe cut -oul in Ihe s haft. Install the rocker arm as sembly to the cy linder head with bracket bolts 3. T orque the possible. Remove the spring s J.
H emov!? Remove the exhau st va lve seats 8 fr om the cy linder head 9 using a special seat removing tool, Inset B. Remove the push rod tubes 12 from the cylinder head 9 by driv i ng them down throug h the h ead, Rem ove tile puSh rod tube "0" ri ngs 13 and discard them.
Press the guides into the head [rom t hl' top of the cylinder head. The guides must protrude above the cylinder head intake 1. After the gu ides have been pressed in to place, the' , must be ream ed to. To ins tall new exhaust valve se ats 8 , clean the r 'cI'Ss in tlle cylincl er heael 9 , Plac l the valve scat s in dry ice to shrink them.
I nsta ll the valve retai ner locks 2 and r em ove the spring compressor c ar eful ly. Ins ta ll the valve springs 1 and t. The plug must be pressed in place and firmly seated aga inst the retaining ridge In the cylinder ht'ad.
Lubrica te the intake valves 6 and exhau st val ves 7 with clean engi ne oil and in sta ll them in their ori g ina l location. Com press the val v e springs so that the intake. It is impossi ble to d etermine whether or no t the r ota tor i s turning without an identifying rnark. P la ce a dab of white paint on ea ch oJ the 1'0' tators and note it's position , Sta rt the eng ine and observ e whether or not the rotator is turning.
DO "OT a ttempt r ep ai rs on rota tors. There i s not a set speed a t whic h the rot ators should turn. Some ro tators will turn faster than others.
As long as the rotator is t urning the valve, it is functi oning proper ly. Usi ng a valve spri ng compressor, compress.
Release he s pring com pr 'sso r a nd ,r emov ' t he intak e va lve seal. Remove the s prings 1 a nd va lve' s pri ng sea ts 6. Remove any carbo n from t he va lve s tem s belorc they are r 'moved from the cylin der head. Remove the in take valves 8 and the e xhaust valves 7 fro m the cyli nder head 9 a nd se t them in a r ac k o r holder. NOTE: Mark t he va lves on r emova l so t hey ca n be ins ta ll ed in t heir origina l location. Remove the e xhaust va lve sea l, 12 Iro m.
NOTE: Never at tempt to remove a va lve s ea t with a cent er punch, cold c hisel or pry bar. To r e m ove Ihe expansio n plug 13 from the. P ress the g uides into the head from the to p of t he cy linder head. The guides must protrude a bove the cylinder head I intake a nd e xhaust 1. After the g uide s have been pressed into place, t hey mus t be reamed to.. Place the valve s ea lS in dry ice to shri nk the m. Insert the valve seats in the hea d and press them in pla ce.
Lubrica te th e intake va lves 8 'l nd e xha us t valves 7 with c lea n e ng ine oi l and instal l them in thE'll' original location. Install the valve spring sea ts 6 , valve springs 1 a nd the va lve reta ine rs 4 on the int ake valvE'S 8.
Rocker Arm Assembly Worn. It Is possible for the oil pump suction assembly to come off the engine oil pump from improper installation. With the pick up screen off. Remove oil pan and inspect oil pump suction assembly. Engine Oil Pump Worn The engine oil pump can be worn from long service, contaminates in the oil, improper installation or no backlash in pump drive gear. Remove engine oil pan and inspect oil pump.
Engine Main Bearings Worn. Oil Pump Suction Screen Plugged The pump suction screen can become plugged with sludge, metal filings and other contaminants in the oil. Many times the oil pressure will be normal when engine is first started. The longer the unit runl, the more contaminants are collected on the pick-up screen shutting off the supply of luction oil. Remove engine oil pan and inspect oil pump screen. A worn main bearing will have a thudding sound and increased engine vibration.
A erack. If luch leakage is suspected. A camshaft bearing knock is not a very sharp sounding knock. Remove oll pan snd oil pump. Remove the cylinder head from the engine block. Refer to section for he. NOTE: This cylinder head requires two. Compress valve spring and remove valve keepens. Wash, clean and inspect head.
Use a rotary brush to clean around and down into valve ports. Refer to Section for complete head reconditioning. Clean valves with a fino power drive wire brush, removing all carbon and varnish daposits. Be careful not to scratch valve stems. Reter to Section for valve inspection. Check valve guide top surface. Use M tool in a electric drill if required to provide necessary flat area on valve guide. Push seal down until seat jacket touches top of valve guide.
Place plastic installation cap. NOTE: Cap prevents sharp edges on valve litem grooves from cutting valve seal. Install teflon seals on the other intake and exhaust valves. The bolt or nut is backe d off 1 14 tum 10 break the set of the thread s caused. Grade 8, 12 pt. Torque rocker arm mounting bracket bolts to insure that the bolts have retained 25 to 30 ft. Crank engine by inserting a screwdriver into the timing hole in the flywheel housing or torQue tube, and by engaging the ring gear teeth with the screwdriver, align the timing pointer with the 1 O BTOC mark on the flywheel.
Com pre.. Tum the rocker arm adjusting screw on number one cylinder intake valve inwards to take pressure off the push rod. Remove valve spring seat. NOTE: Keep valve s. Remove velve spring retaine r.
Install dial indicator on end of valve stem with valve resting on top of piston. Scribe II mark on Keeping the valve spring compressed. Remove screwdriver and tap end of valve stem to seat keepers. Tappet CI.. Tappet Clearanee. Routa fuel from the.. Repeat for each cylinder.
Connect Case No. CO compression gauge to adapter. NOTE: Take several compression readings on e. STEP 37 It is very important that all cylinder presaurea be apprxomately the same. See chart for allowable compression pressure variation. If compression is greater than normal. If reading il below normal.
NOTE: To make a aimple test when a com-. If pralaure rises to near normel. Very little change in compression Indicatea leakage past the valves. Squirt a few drop. Crank engine counter-clockwise as viewed from the flywheel endl past the specified pump timing: then crank engine clockwise until the timing pointer is in line with the specified pump timing mark on the flywheel.
This procedure will remove the slack from the valve train and will insure correct pump timing. If both push rods are tight. Loosen pump mounting nuts. Move pump toward or away f rom engine until timing marks ate aligned. NOTE: To advance timing, move top of pump aw ay f rom engina. To retard pump. In dnig.. Cylinder Head Installation Cold or loitial Torque If engine is equipped with one piece timing cover.
Pull the front of manifold from the front stud, swing the manifold upward and pull manifold off of rear stud and away from engine. Looaen valve cover nud and nut UMmblles Remove rema ining rocker ann Clean carefully all machined surface areas.
Refar to Staps 65 and Lay a straight edge across the bottom of the cylinder head from comer to comer. Try to g9t a. The maximum limit for head warpage is. If warpage is greater than. A minimum head thickness of 3. Refer to Sleps 65 and Check bore gauge with a micrometer. If the diameter is greater than. If the inside d iameter of the valve guides is less than.
Refer to Step NOTE: Always press guides from the top, through the head. Valve guides must protrude. Fabricate a bushing. The bushing will aid in obtaining correct guide protrusion. Install a new end expansion plug until it is seated and then strike a blow with a hammer to cause ellpansion. Thi s condition is usually caused by worn valve guides or bad seals o n Ihe valves, allowing oil to pass by the valves. Low opera ting temperature is still another cause or worn piston rings and sleeves will allow too much oil to r each the combustion chamber.
This condition can be caused by lack of lubric ation, plugged water passages Or operating the engine under continuous overload at excessive RPM.
Thi s condition can be caused by using poor quality engine oil or fuel and by improper engine storage. Small amounts o f very fine pitting may be found on the surface s of the valve face or seat after the valves are cteaned. This condition is normal and will not affect engine performance.
This fine pitting is caused by a normal oxidation process and can happen on any engine during the run-in period. It is not necessary to grind valves or seats if this f ine pitting is found , since p itting will generally recur after the engine is run for a few hours. These conditions a re usually caused by running the engine under excessive loads a l h igh engine temperature, grinding valve face too thin or improper valve g rinding.
Check exhaust vatve stem diameter at three point. Place the valves in the cylinder head and check valve head recellion. Check valve face and stem run-out. Run-out must not exceed..
Replace valves if run -out exceeds. NOTE: Navar attempt to ,emove valve seats with a c ente r punch, cold chisel or pry bar. Clean the recess in the cylinder head. Place new valve seats in dry ice to shrink them for ease of installation.
Remove the valve and inspect the contact area on the valve face and seat. The bluing will have been removed from the valve face where it made contact with the seat. Use a preCISion seat grinder. Correct refacing of valves and seats will provide a bluing pattern as shown.
If bluing pattern is other than the pattern shown, refer to diagnosis of various bluing patterns on Pages 21 thru Apply a small amount of valve bluing Prussian Blue on the valve face. Install the valve in the head and rotate the valve on its seat. The valve and valve seat must be replaced since additional grinding will not alter the lower contact point.
The va C heck. This angle. The corN! T tlis angle is imp ortant sinoo it illds in el,ltling carbon. Check for valve protrusioo. Piece II straight edge 00 the valve and measure the distaoce between the. If protrusion is more than. TefeT to pages 21, 22 and 23 fOT proper valve and seat g ri nding. Check for valve recession. Place 8 Itraight edge over the valve and measure the distance betweeo the straight edge and the valve head , using a feeler gauge.
If recession is more than. Install valve keepers on the top valve Ilem 9roove. NOTE: Always install new valve keepers when new valves are installed. NOTE: Refer to Sections or , sleeve protrusion, if you are experiencing head gasket leakage problems. Check pus h rods for wear and straightness bafore installing into cylinder head. Coat push rods with HOM 30 oil. Coat bolt threads. Repeat torquing sequence and bring nuts or bolts to full torque. Grade 8. Flanged nuts - torque ft.
Inspect shafts for worn spots on the bottom side of shaft. Replace the shafts if a wom condition e;ltists. Coat all pans with HOM 30 oil. Prior to engine serial number , the drilled bolt must be located in the center rocker arm mountfng bracket. After engine serial number , the drilled bolt must be located in the rear rocker arm mounting bracket. Install the front rocker arm shaft Into the intermediate bracket. NOTE: The front shaft is installed with the short end of the shaft from the cut-out towards the front of the engine.
On shahs with oil holes drilled only on one side, point the oil holes downward and on shafts with oil holes drilled on both sides, align the holes in a horizontal plane. Install a right hand rocker arm on shaft with correct slant of arm in correct position as shown. NOTE: Failure to use the correct adjusting screw with designated rocker arm.
Rocker arms are completely interchangeable. See above inset. Install end of shaft assembly into the center bracket and install bolt and washer into the intermediate bracket. Torque the intake manifold nuts and washers accordingly: on aluminum manifold, torque nuts 30 to 35 ft. Install the exhaust manifold by holding front in raised position and installing rear of manifold on rear stud.
Lower front of manifold down and install on front stud. Install capscrew and torque 35 to 42 ft. Install the fuel injectors. Refer to section for injector installation. If push rods are loose, the number one cylinder is at TOe on the compression Slroke.
If push rods are tight. Check the rocker arms. Check and adjust the intake end exhaust. Do not loosen all nuts or bolts simultaneously, but loosen and tighten each individual nut and bolt in prescribed sequence. If this is not done II false reading is obtained. RetorQue rocker arm mounting bracket bolts to insure they have retained 25 to 30 ft.
STEP After the engine has run for one hour, remove the breather tube and cylinder head valve cover. The cylinder head bolts or nuU and rocker arm mounting bracket bolts must be retorqued. Crank the engine until the timing pointer is aligned with the TOe timing mark 0f1 the flywheel.
Check the push rods on number one cylin-. If the push rods tight. Tappet Clearance Hot - Intake Valves. Ch6ck and adjust the intake and exhaust valves as pointed out by the arrows below. Install the cylinder head gasket and cover, torque cover nuts 4 to 6 ft. Reinstall breather tube. To remove the tachometer drive, a special tool must be made. Refer to specifications for making special tools. Remove exhau. Push the dowels into the valve lifters hole.
If equipped,. Using a bore gauge, measure the camshaft busBngs. The bushing must be measured in two places. Insert bushing puller A41 1 03 into the angine block to remove camshaft bushings. NOTE: The crankshaft, cylinder sleeves and pistons have been ramoved for photographic purposes only. These pans need not ba removed when servicing camshaft. The one oil hole Is offset to one side and should face towards the front of the engine when installed.
To replace the rear camshaft bushing. The rear camshaft cup plug must be removad before the rear camshaft beating can be reo moved from the engine block.
Remove cup plug from engine block by inserting a rod into the block and then tap plug out. Install the rear bushing on the puller with oil holes aligned and pull bushing into the block.
The two oil holes are offset to one side and should face towards the front of the engine when installed. On engines prior to serial number The other rear bushing all hole will not line up as it i. On en. Remove the lifters from the engine block.
Using a micrometer, measure ttla bore gauge setting. Install the lifters into the block and secure in place using the wood dowels See Step Mike the valve lifters. If lifter stem 0. Check the thickn8Sll of the thrust washer. If thickness is tess than. Each bearing surface must be measured in four places. Measure front and rear bearing surfaces again, 90 0 from first measurement.
If the 0. Clean the camshaft thoroughly and blowout the oil holes with compressed air. Place the thrust WtlIhar on the camshaft and install the shaft key.
He8t the camshaft gear. Push camshaft all the way into the engine block and align holes In camshaft ge. Install external tooth Jockw. Backlash must be. Install oil slinger ring over end of crankshaft with cupped face toward crank gear and notch aligned with key way on crankshaft. Set timing gear cover with fuel pump on engine block aligning dowels to position cover. If equipped. Refer to section for front pulley seal replacement. Install new timing gear cover gasket over aligning dowels.
Apply 2 Permatex to open face of gasket from lower mounting hole, downwards. Install all external bolts and torque 25 to 30 ft. Install the two intemal bolts and torque 25 to 30 ft. Cut off protruding gasket flush with housing. With a bore gauge.
Measure the 0. Measure the bote gauge dimension with a micrometer. If the 1. Remove mounting bolt. Tha running clearance should be. Reinstall mounting bolts tn leKer gear, torque 35 to 42 ft. Bectdash must not exceed. Holding idler gear with a screw driver.
Backlash must not exceed. Apply 2 Permatex on both sides of gasket at the front and rear portions only. Torque retaining bolts 10 to 12 ft. On the cast iron oil pan. Install a new cover plate gasket, covet plate and water tube. Torque bolts 26 to 30 ft. Adjust the valve tappets. Refer to Steps thnl Install i-valve cover. Remove belt from pulley. Inmll pulley on crankshaft. Apply pennetex No. F1ywheeI r.. Install new Hal carrier gasket on engine block.
Apply Permatex No. Trim excess gaske t material. Remove sleeve tool. Install Aligning Tool. G with the tool pins in aligning holes of carrier.
The tool must be installed over the flange of the crankshaft. Press new rear oil seal into the carrier with seal lip inward. Apply HOM No. Tighten Ute mounting boltl snug, until gasket and carrier i. Remove the front of the manifold off of the front. Swing manifold upward and remove the manifold from the rear stud.
Disconnect the inlet fitting. Disconnect the high pressure lines from the fuel injectors. Remove crankshaft pulley. If equipped, remove the one piece timing ge. NOTE: If 8 hex. Remove connecting rod bearing caps from connecting rods. If vertical dimension i. Refer to Specftication..
Q Measure the connecting rod journals. If taper exceeds. Minimum th,ic. Replace liner if dimension is lesa than specified. The flattened plastl gauge wll be found on either the bearing shall or crankshaft. The number within the graduation Indicate. NOTE: Und. Install the main bearing caps in the e ngine.
The numbered side of the main bearing caps must be toward the camshaft. Make sure the mairt bearing caps are installed in the correct numtieted location. The crankshaft end thrust is- -taken up by the center bearing liner flange. To obtain an accurate reading. Take up all the end play and check indicator reading. Maximum end pla.
If excessive end play cannot be taken up by a new center main bearing liner. Use II. Wipe clean the connecting rod journals lind bearing liners. Place II piece of plasti uge on the connecting rod ca p liner. Ratain in place with mounting nuta. The number within thl! The oU. If the clearance exceeds these limits. Torque the oil pump mounting bolts 90 to ft.
Place a dial indicator on the camshaft gear and check backlash between camshaft gear and crankshaft gear. If backlash exceeds. NOTE: Excessive backlash could also be caused by worn camshaft bushings. If backlash exceeds or is leu than specified, add or delata shims between oil pump and front main bearing cap to obtain correct backlash, See Step Appty PermatelC No.
Apply PermltelC No. Tor- ,t que. Connect inlet fitting. Apply No. Install capscrew and torque 35 to 42 -ft. Install oil pan and gasket. Torque st8mped steel oil pan mounting bolts 10 to 12ft. Install ring gear with chamfer side of gear teeth outward and larger 1. Iied p. On dry clutch tractor flywheel , install snap ring in groove of flywheel.
Install new all seal from rear side until seated against the snap ring. Install flywheel and output hub. Torque retaining boh. Oil Pump Removal Remove oil pan mounting bolt.. Torque pump cover mounting bolts 6 to 8 ft. NOTE: While tightening bolts and screws. Compress relief valve spring and cup plug until plug ia below cotter pin hole.
Insert new cotter pin through hole in body. Rafar to Step. Place a dial indicator on the -oil pump drive gear and check backlash between drive gMr and cranksttaft gear. If backlash exceeds or i, unde, the above range, add or delate shima between oil pump and No. NOTE: Oil pump shima are. If equipped with cast ifOn oil pan. Torque remaining mounting bott. NOlE: Torque drain plug 29 to 31 ft.
Refill crankcase with proper amount and type of oil. Test Specifications Power shuttle Idle speed, ,. Maximum no load speed. HydraUlic stall speed.
Combined converter and hydraulic stall speed. Accelerate to full throttle and hold for 15 seconds then ShUt to Neutral and run at full throttle for 15 seconds. Repeat step 2 until needle on transmission oil temperature gauge Is In middle. Repeat cycle until oU Is at specified temperature. If a thermometer Is not avaHable. Apply puking brake and start engine. Shift transmission to fourth 4th gear and power Shuttle to Forward,. Increase engine speed to half throttle and roll the bucket back.
To Identify the problem area, conduct Tests 2 and 3, If both tests are unsatisfactory, the cause of trouble is very likely the engine. If engine speed is above. A tinny sound from the converter indicates damaged converter blading and replacement of the converter. Roll the bucket back and hold control lever in power position. Repeat test; If engine speed is s till low, the engine is likely at fault. To correct the prob-. If engine speed is above the specified rpm the hydraullc system Is at fault.
Refer to Section for trouble shooting and hydraulic system test information. The power or mechanical shuttle remains in the machine when the engine is removed. Remove engine side panels Hao equipped and hood and muffler. Disconnectbattery ground cable at battery. Feedback on our suggestions. Report this item Report this item - opens in new window or tab.
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Compatible Equipment Make:. Model Year:. Equipment Type:. Backhoe Loader Tractor. Equipment Make:. Compatible Equipment Type:. Backhoe Loader, Tractor. Shipping and handling. Item location:. Brookfield, Missouri, United States. Ships to:. Get Rates. Sales Tax for an item Seller collects sales tax for items shipped to the following states:.
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