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TM 10-3930-638-24&P
3-5. ENGINE MAINTENANCE (cont)
j. Rocker Arm Assembly (cont).
STEP
LOCATION
ITEM
ACTION
REMARKS
CLEANING (cont)
WARNING
Wear safety glasses when drying parts with compressed air.
Failure to do so could cause serious injury to eyes and possible
blindness. If you hurt your eyes or if a foreign object is blown into
your eyes, seek medical attention immediately.
4
INSPECTION/REPAIR
5
6
7
8
9
All parts
Clean
Use cleaning solvent P-D-680. Dry
thoroughly with compressed air
NOTE
Flush rocker arm shafts (12) and drilled bolt (1) to remove
residual material. Use compressed air to check oil holes for
obstruction.
Drilled bolt (1), washers
Inspect
Replace if worn, or if threads damaged
(2) and cap screws (3)
Rocker arm shafts (12)
Springs (8)
Rocker arms (6 and 7)
and brackets (4, 5, 10
and 11)
Eight push rods (13)
Inspect
Measure outside diameter with microm-
eter at worn spots on bottom of shaft.
Replace shaft if outer diameter is less
than 0.622 inch, or if shaft is corroded,
pitted, cracked or scored
Inspect
Install in spring tester. Check that force
to compress spring to 1.75 inch is 7.5
to 8.5 pounds. Replace spring if required
force is not 7.5 to 8.5 pounds
Inspect
Use bore gage and check inside diameter.
Measure bore gage with micrometer.
Replace if inside diameter is greater than
0.626 inch, if pitted, scored or cracked, or
if rocker arm adjusting screw threads
damaged
Inspect
Replace if bent (place rod on flat surface
and roll over surface; rod should roll
smoothly indicating it is not bent),
cracked, pitted or excessively worn
3-64
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