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 TM 9-2815-220-24
THEORY OF OPERATION
0004 00
ENGINE COMPONENTS (Continued)
Camshaft Timing Gears:
The camshaft timing gears are a series of gears and shafts that transfer power from the
crankshaft to drive the camshaft in such a way as to ensure the valves operate at the proper
time.
The accessory drive gear (A) and accessory drive gear shaft assembly (B) drive both
camshafts. Individual drive bevel gear shafts (C), camshaft drive gear shafts (D), and
camshaft driven gear shafts (E) drive each camshaft through inclined quill-type drive
shafts (F).
The quill shafts can be removed to permit separate rotation of the camshafts for engine timing.
The quill shafts have different number of splines on each end that allows them to be inserted in
the camshaft bevel gear shafts when camshafts are correctly positioned in relation to the
crankshaft without disturbing the relationship between the camshafts and crankshaft.
E
D
F
B
D
C
F
Left Bank Camshaft
E
C
Right Bank Camshaft
Flywheel
A
Damper
WP 0004 00-9
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