F U E L
S Y S T E M
FINDING TOP CENTER COMPRESSION
POSITION FOR NO. 1 PISTON
Tools Needed:
5P7307 Engine Turning Tool Group.
3/8-16 NC Bolt.
No. 1 piston at top center (TC) on the compres-
sion stroke is the starting point for all timing pro-
cedures.
1. Remove the valve cover.
2. Remove plug (1).
NOTE: The engine is seen from the flywheel end
when direction of crankshaft rotation is given.
3. Remove the starter motor and install 5P7307
Engine Turning Tool Group.
4. Turn the flywheel clockwise approximately 60°.
L O C A T I O N O F P L UG
1. Plug.
5.
6.
7.
TM 5-3805-258-24-1
TESTING AND ADJUSTING
Now turn the flywheel counterclockwise until
a 3/8" 16 NC bolt (2) can be put through hole
(3) and installed in the timing bolt hole in the
flywheel.
Look at the valves for No. 1 cylinder (the two
valves at the front of the engine). The intake
valve and exhaust valve for No. 1 cylinder must
be closed. If they are closed, you will be able to
move both rocker arms up and down by hand.
If the intake valve and exhaust valve for No. 1
cylinder are not closed, remove bolt (2). Turn
the crankshaft counterclockwise 360° and in-
stall bolt (2). Both valves are now closed. This
is top center (TC) compression position for
No. 1 piston.
I N S T A L L I N G B O LT
2. Bolt. 3. Hole.
NOTE: If the flywheel bolt hole is turned beyond
hole (3) and bolt (2) can not be installed, turn the
flywheel clockwise approximately 60°. Then, turn
it counterclockwise until bolt (2) can be installed.
The reason for this step is to be sure the play is re-
moved from the timing gears when the engine is put
on top center.
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