CRANKSHAFTS & CAM GEARSEnd PlayAluminum Engines -- Ball BearingProceed as in aluminum plain bearings, except the thrustwasher is added to the magneto end of the crankshaftinstead of the power take-off end. Thrust washer cannotbe used on engines with two (2) ball bearings.Sump InstallationModel 100900 and 130900 SeriesOn these models use spring washer on cam gear asshown in Fig. 17.Fig. 17 Sump Installation –Model Series 100900 and 130900To protect the oil seal while assembling the crankcasecover, put oil or grease on the sealing edge of the oilseal. Wrap a piece of thin cardboard around thecrankshaft so the seal will slide easily over the shoulderof crankshaft. If the sharp edge of the oil seal is cut orbent under, the seal may leak.Checking End PlayThe end play may be checked by assembling a dialindicator on the crankshaft with the pointer against thecrankcase. Move the crankshaft in and out. Theindicator will show the end play. Fig. 18. The othermethod is to assemble a pulley to the crankshaft andmeasure the end play with a feeler gauge. Fig. 18. Endplay should be .002.-008" (.05-.20 mm).Fig. 18. Checking Crankshaft End PlayINSTALL CRANKSHAFT AND CAM GEARCast Iron Engines -- Plain BearingAssemble the tappets to the cylinder, then insert the camgear. Push the camshaft into the camshaft hole in thecylinder from the flywheel side through the cam gear.With a blunt punch, press or hammer the camshaft untilthe end is flush with the outside of the cylinder on thepower take-off side. Place a small amount of sealer onthe camshaft plug, then press or hammer it into thecamshaft hole in the cylinder at the flywheel side. Installcrankshaft so timing marks on teeth and cam gear align.All Cast Iron Engines -- Ball BearingExcept Models 300000 and 320000Assemble the tappets, then insert cam gear into thecylinder, pushing the cam gear forward into the recess infront of the cylinder. Insert crankshaft into cylinder. Turncamshaft and crankshaft until timing marks align, thenpush cam gear back until it engages the gear on thecrankshaft with timing marks together. Insert camshaft.Fig. 19. Place a small amount of sealer on the camshaftplug, then press or hammer it into the camshaft hole inthe cylinder at the flywheel side.Fig. 19. Install CrankshaftCast Iron Engines -- End PlayPlain Bearing and Ball BearingThe crankshaft end play should be .002" (.05 mm) to.008" (.20 mm) with one .015" (.38 mm) gasket in place.If the end play is less than .002" (.05 mm), additionalgaskets of .005" (.13 mm) or .009" (.23 mm) may beadded to the .015" (.38 mm) gasket in variouscombinations to attain proper end play. If the end play ismore than .008" (.20 mm) with one .015" (.38 mm)gasket in place, a .009" (.23 mm) or .005" (.13 mm)gasket may be used. Fig. 20.7
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