1
2
3
4
5
6
TM 9-4940-568-20
8-9
NOTE
Intake valve clearance .010 in.
(0.254 mm).
Exhaust valve clearance .020 in.
(0.508 mm).
Valve adjustment may only be
done on cool engine (140F)
(60C).
The clearance is correct when
some resistance is “felt” when
the feeler gauge is placed
between the valve stem and the
rocker arm.
(11) Tighten tappet adjustment screw (6) until
proper clearance is obtained.
(12) While keeping tappet adjustment screw (6)
at the correct clearance tighten jamnut (5) to
18 lb-ft (24 N.m).
NOTE
If more than one rocker arm is
replaced, repeat Steps (4) through
(12).
The engine crankshaft must be
rotated 360 for each rocker arm
installed.
(13) Install gasket (3), rocker arm cover (2) and
screw (1) on cylinder head (4). Tighten
screw to 18 lb-ft (24 N.m).
f.
Follow-On Maintenance:
Install rear panel, (TM 9-4940-568-10).
Start generator and listen for unusual noise and leaks, (TM 9-4940-568-10).
Connect batteries, (TM 9-4940-568-10).
END OF TASK
