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TM 10-3930-638-24&P
3-5. ENGINE MAINTENANCE
a. Engine Tune-up.
(1) Locating Top Dead Center.
This task covers locating top dead center position for No. 1 cylinder.
INITIAL SETUP
TOOLS
EQUIPMENT CONDITION
Automotive Mechanic’s
NSN 5180-00-754-0641
Paragraph
Condition Description
Tool Kit
Vehicle parked on level surface, engine
off, and parking brake applied.
MATERIALS/ PARTS
2-53c
Left side panel removed.
None
3-5h
Flywheel housing timing hole cover open.
3-5i
Rocker arm cover removed.
STEP
LOCATION
ITEM
ACTION
REMARKS
1
Flywheel housing, a. Engine flywheel
Rotate clockwise
Engage flywheel ring gear teeth with blade
left side engine
of screwdriver as shown. Rotate engine
compartment
until pointer in timing hole is in line with
TDC mark on flywheel
b. Push rods for No. 1
Check for
If push rods are loose, engine is at TDC
cylinder
looseness
position for No. 1 cylinder. If push rods
are not loose, rotate engine one complete
revolution from position in step a above,
and recheck push rods of No. 1 cylinder
for looseness
2
Cylinder head,
engine compart-
ment top
NOTE
Perform the following-steps only if accuracy of flywheel timing
pointer is in doubt.
3-24
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