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 TM 55-1905-219-14-5
3-91. CAMSHAFT AND GEAR TRAIN.
The camshaft, gear train and associated parts maintenance instructions are contained in the following
paragraphs:
DESCRIPTION
PARAGRAPH
Gear Train
Engine Timing
Idler Gear and Bearing Assembly
Crankshaft Timing Gear
Camshaft and Balance Shaft
3-91.1. GEAR TRAIN.
a. A completely enclosed train of five helical gears is located at the rear end of the engine. A gear bolted
to the crankshaft flange drives the camshaft and balance shaft gears, as well as the blower drive gear, through
an idler gear mounted between the crankshaft and balance shaft gears.
b. The camshaft gear and balance shaft gear mesh with each other and run at the same speed as the
crankshaft. Since these two gears must be in time with each other, and the two as a unit in time with the
crankshaft gear, the letter "O" is placed on one tooth of one of the gears with a corresponding mark at the root
of the mating teeth of the other gear.
3-1564
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