TM 9-4520-251-14
5-12 CRANKSHAFT AND CAM GEAR (CONT)
Location/Item
Action
Remarks
3. Crankshaft
Inspect for bend in crankshaft (2). Check for worn
gear teeth and damaged threads. Inspect keyway
for damage, Inspect for out–of–round journals (26
and 28). Discard crankshaft having any of above
5. Cam gear
6. Journals
and lobes
defects.
4.
Journals
Journal (26) at power takeoff
end must exceed 0.998 inch
(25.35 mm) in diameter. Crank
pin (27) must exceed 0.996 inch
(25.30 mm) and journal (28) at
armature end must exceed 0.873
inch (22.17 mm). Discard crank–
shaft not meeting these
specifications.
Inspect teeth of cam gear (16)
for wear and nicks. Replace if
defective.
Journals (29 and 30) of cam
gear (16) must exceed 0.498
inch (12.65 mm) in diameter.
Cam lobes (31 and 32) must
exceed 0.950 inch (24.13 mm).
Discard cam gear not meeting
these specifications.
INSTALLATION
NOTE
It is assumed that if ball bearing was removed, new
one was installed as described in paragraph 5–11.
7.
Crankshaft and
When reassembling engine, if
cam gear
tappets have been removed, be
sure they are inserted first.
Align timing marks (22 and 23)
on crankshaft (2) and cam gear
(16) and insert crankshaft and
cam gear together. Refer to ex–
ploded view illustration and complete
assembly of crankshaft and cam gear.
NOTE
Install new crankcase gasket when replacing crankcase cover (1).
5-27
