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 TM 55-1905-219-14-6
3-166.1. GEAR TRAIN - MAINTENANCE INSTRUCTIONS (Continued).
(12) Since the camshaft and balance shaft gears each have the same number of teeth as the crankshaft
gear, they will turn at crank-shaft speed. However, as the blower drive gear has only about half as many teeth
as the camshaft or balance shaft gear, it turns at approximately twice the speed of the crankshaft.
b. Lubrication
The gear train is lubricated by overflow oil from the camshaft and balance shaft pockets spilling into the
gear train compartment. A certain amount of oil also spills into the gear train compartment from the camshaft
and balance shaft end bearings, and idler gear bearings. The blower drive gear bearing is lubricated through
an external pipe leading from the main cylinder block oil gallery to the gear hub bearing support. The idler gear
bearing is pressure lubricated by oil passages in the idler gear hub which connect to the oil gallery in the
cylinder block.
3-2828
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