CHECKING AND CORRECTING CRANKSHAFT END PLAY

TM-5-4240-501-14P Special Diver Air Support System (SDASS) NSN 4220-01-292-3708 Manual
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CRANKSHAFTS & CAM GEARS Auxiliary Drive Cam gear end play is checked in the same manner as crankshaft end play. Cam shaft end play must be .002" (.05 mm) to .008" (.20 mm). If end play is less than .002" (.05 mm), add service shims (#270516-.009" (.23 mm); #270517-.007" (.18 mm); or #270518-.005" (.13 mm) to obtain proper end play. If end play is more than .008" (.20 mm), use service bearing assembly kit #299706, which includes above shims to obtain proper end play. Use chalk or crayon to mark the top of crankshaft gear tooth, whose inner end is directly in line with the notch of the timing mark. See Fig. 25. Fig. 25. Aligning Timing Marks Align timing marks on crankshaft and cam gear, and install crankshaft. Install crankshaft carefully so crankpin is not damaged. Install power take-off and magneto side bearing supports. Torque power take-off support screws to 185 inch-pounds (2.2 mkp, 20.9 N•m). Torque magneto side support screw to 85 inch-pounds (1.0 mkp, 9.6 N•m). See Fig. 26. Fig. 26. Installing Bearing Supports See Section 12 for timing of synchro-balance timing gears. CHECKING AND CORRECTING CRANKSHAFT END PLAY Crankshaft end play tolerance is machined at the factory and normally requires no adjustment, unless the bearing supports or crankshaft is replaced. Crankshaft end play must be .002" (.05 mm) to .008" (.20 mm). If end play is less than .002" (.05 mm), add service shims (#270513-.015" (.38 mm); #270514-.010" (.25 mm); or #270515-.005" (.13 mm) to obtain proper end play. If end play is more than .008" (.20 mm), use service bearing support assembly kit #299705, which includes the above shims, to obtain proper end play. Auxiliary P.T.O. -- Model Series 92580, 92980, 94580, 94980, 110980, 111980 This auxiliary power take-off shaft is perpendicular to the crankshaft. It rotates at the rate of one revolution for every 81/2 revolutions of the crankshaft. On these models, the cam gear, worm gear and oil slinger are a Factory assembly and are not available as separate pieces. See Fig. 27. Fig. 27. Remove and Install Sump Screw NOTE: If rotation is counterclockwise, the thrust washer is placed next to the worm gear on camshaft. To remove the sump: One of the six sump mounting screws is located under the auxiliary drive cover. Remove the cover. Lift out shaft stop. See Fig. 28. Slide gear and shaft sideways to expose head of sump mounting screw. Use 7/16" socket to remove screw. 9

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