SERVICE MANUALCRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASESection 64.Remove the pilot bearing from the flywheel (ifequipped). After cleaning inspect it for wear anddamage.a.If the bearing is still serviceable lubricate itwith clean engine oil and reinstall it.b.If the bearing has considerable service,replace it.Repair the Flywheel and Ring Gear as follows:1.Grind the flywheel as required. The maximumallowance for removal is 1.6 mm (1/16 in.).a.It is not necessary to remove all grooves orscoring.b.DO NOTremove more surface materialthan specified. Otherwise interference ofthe driven member hub with the clutch pilotbearing in the flywheel will result.2.Remove the broken ring gear from the flywheelby heating the gear with a torch to expand it.Then drive gear from the flywheel.3.Install a new ring gear as follows:a.Heat the gear to 260° 290°C (500° 550F)for expansion.b.Place the hot gear onto the flywheel.c.The chamfered edge of the ring gear l.D.must be next to the shoulder of theflywheel.4.Check Flywheel Housing Face Run-Out asfollows:a.Attach a dial indicator to the crankshaft flangeand place the indicator pointer against theflywheel housing flange.Figure 13. - Checking Run-Out of Flywheel HousingFace in Relation to the Axis of the Crankshaftb.Check at four points 900 apart, for total facevariation.c.Keep crankshaft "end play" at zero in thesame direction for all readings as shown inFig. 13.d.Allowable housing face run-out tolerance is0.20 mm (0.008 in.)5.Check Flywheel Housing Bore Concentricity asfollows:a.Attach a dial indicator to the crankshaft andplace the indicator pointer against theflywheel housing bore as shown in Fig. 14.b.Rotate the crankshaft slowly and note totalindicator reading variation.c.Allowable housing bore concentricitytolerance is 0.20 mm (0.008 in.).CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 13
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