TM 9-2320-260-34-1
3-81. ENGINE INJECTOR TIMING INSTRUCTIONS (Contd)
b. Injector Timing
1. Loosen both dial indicator supports on timing fixture.
NOTE
At Top Dead Center (TDC), piston travel plunger will be near the
top of its travel.
2. Rotate crankshaft (1) in direction of engine rotation to TDC.
3. Adjust both dial indicators on timing fixture to their fully compressed position.
4. Raise both dial indicators approximately 0.020 in. (0.51 mm) and lock in place with setscrew.
NOTE
Both dial indicators move in the same direction when piston is
on compression stroke.
TDC is indicated by maximum clockwise position of the pointer
on the dial indicator.
5. Rotate crankshaft (1) back and forth to ensure piston is precisely at TDC on compression stroke.
6. Turn piston travel dial indicator face to aline zero with pointer. Lock dial indicator face with
thumbscrew.
NOTE
At After Top Dead Center (ATDC), piston travel plunger will be
near bottom of its travel.
7. Rotate crankshaft (1) in direction of engine rotation to 90 ATDC.
8. Turn push tube travel dial indicator face to aline zero with pointer. Lock face with thumbscrew.
NOTE
Step 9 is necessary to remove gear train lash.
9. Rotate crankshaft (1) in opposite direction of engine rotation through TDC to 45 Before Top Dead
Center (BTDC).
10. Turn crankshaft (1) in direction of engine rotation until piston follower rod on timing fixture is in
contact with dial indicator stem.
11. Move crankshaft (1) very slowly until piston travel dial indicator reads 0.0032 in. (0.0813 mm)
before zero.
NOTE
The position of piston travel is now 19 BTDC.
12. Read push tube travel dial indicator. Push tube travel should read 0.0290 in. (0.7366 mm).
a. If push tube travel is not 0.0290 in. (0.7366 mm), proceed to step 13.
b. If push tube travel is 0.0290 in. (0.7366 mm), proceed" to follow-on task.
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