SERVICE MANUALTIMING, GEAR TRAIN & FRONT COVERSection 7GENERALThe gear train lies under the crankcase front cover. Thegear train is simple in design. The idler gear (2, Fig. 3),driven by the crankshaft gear (1), drives the enginecamshaft gear (3) and the injection pump gear (4 or6,depending on pump). If equipped, a tachometer adapter(5, Fig. 4a) mounts to the injection pump drive gearaccess cover (6, Fig. 4a). The tachometer driven by aslot in the end of the injection pump camshaft forengines equipped with Robert Bosch Model MW FuelInjection Pump. For engines equipped with UTDS*Model 100 Fuel Injection Pump a plastic tachometer gear(5, Fig. 3) meshes with the injection pump gear (4, Fig.3) to drive the tachometer.Figure 3. - Timing Gear Rotation1.Crankshaft2.Idler3.Camshaft4.Injection pumpEngine equipped with5.TachometerUTDS* Model 100(if equipped)Injection Pump6.Injection pumpEngines equipped withRobert Bosch ModelMW Fuel InjectionPumpThe idler gear is supported on a set of tapered rollerbearings. The camshaft gear is keyed to the shaft andheld in place by a press fit. The injection pump gear (5or 7, Fig. 4 or 4a) is fastened to the pump shaft bymeans of a hub.For engines equipped with UTDS* Model 100 FuelInjection pump, the tachometer (6) is fastened by twonuts and a thrust plate, as shown in Fig. 4.Figure 4. - Crankcase Front Cover - Engines equippedwith UTDS* Model 100 Fuel Injection Pump1.Water pump5.Injection pump2.Front covergear3.Lube oil pump 6.Tachometer gear4.CrankshaftThe Crankcase Front Cover (2, Fig. 4 or 4a) servesmany purposes. In addition to housing the gear train, thefront cover carries the water pump (1), lube oil pump (3)and fuel injection pump (not shown).*United Technologies Diesel Systems (formerly AMBAC)CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 2]
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