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TM 10-3930-643-34
GENERAL SUPPORT ENGINE, FUEL, EXHAUST AND COOLING MAINTENANCE. (cont)
13-9.
Camshaft and Timing Gears. (Sheet 2 of 8)
REMOVAL
NOTE
Before removal of camshaft,
check lobe lift with dial
indicator.
Intake total lobe
lift is 0.2905 inch.
Exhaust
total lobe lift is 0.2907 inch.
Replace camshaft and tappets if
total wear of 0.020 inch is
indicated.
Before removal of camshaft,
check camshaft end play.
End
play must be 0.005 to 0.013
inches. Replace thrust plate if
greater end play is indicated.
Before removal of camshaft,
check backlash of timing gears
using dial indicator.
Backlash
of cam and idler gear must
not
exceed 0.016 inch.
Backlash of
idler and crankshaft gear
must
not exceed 0.016 inch. Backlash
of idler and injection pump gear
must not exceed 0.016 inch.
Replace any pair of gears with
excessive backlash.
1.
Mark location of 12 tappets (1) in
crankcase and remove.
Go to sheet 3
13-62
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