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TM 5-2420-222-34
3-16.
ENGINE TIMING.
This Task Covers: Adjustment
Initial Setup:
Equipment Conditions:
Tools/Test Equipment:
•
Rocker arm cover removed (see TM 5-2400-222-20).
•
General mechanic’s tool kit
•
Field automotive shop set
NOTE
Timing gears are marked for ease of Installation. Marks on timing gears consist of
slash-marks stamped on all faces except the Idler spur gears. When slash-marks
on gear faces aline with center of crankshaft, with no. 1 cylinder at top dead center
(TDC), as illustrated, gears are timed correctly.
ADJUSTMENT
NOTE
Cylinders are numbered from one to four starting at fan end of engine assembly.
1.
Remove pin (1) and cover (2) from flywheel housing (4).
2.
Manually crank engine assembly until no. 1 cylinder is at TDC and hole in flywheel (3) is alined with timing hole in
flywheel housing (4).
3.
Insert pin (1) timing hole in flywheel housing (4) until seated in hole in flywheel (3).
4.
Remove timing gear cover (see paragraph 3-18).
NOTE
Steps 5 through 11 are performed with all gears Installed in their proper locations.
5.
Using dial indicator, measure upper idler spur gear (6) backlash. Backlash must be 0.0027- 0.0166 in. (0.0686-
0.4216 mm). Adjust end play as required (see paragraph 3-15).
6.
Using dial indicator, measure camshaft helical gear (11) backlash. Backlash must be 0.0028- 0.0185 in. (0.0711-
0.4699 mm). Adjust end play as required (see paragraph 3-17).
7.
Using dial indicator, measure fuel metering pump helical gear (5) backlash. Backlash must be 0.0028-0;0185 in.
(0.0711-0.4699 mm). Adjust end play as required (see paragraph 5-3).
8.
Using dial indicator, measure lower idler spur gear (10) backlash. Backlash must be 0.0027- 0.0187 in. (0.0686-
0.4750 mm). Adjust end play as required (see paragraph 3-15).
3-96
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