TM 5-3810-300-24&P-3
1.7.5
CRANKSHAFT TIMING GEAR
4. Provide a base for the puller screw by placing a steel
plate across the cavity in the end of the crankshaft.
Then remove the gear with a suitable puller as
shown in Fig. 1.
Inspection
Clean the gear with fuel oil and dry it with compressed
air. Examine the gear teeth for evidence of scoring,
pitting or wear. If severely damaged or worn, install a
new gear. Also check the other gears in the gear train.
Install Crankshaft Timing Gear
Fig. 1 - Removing Crankshaft Timing Gear
1. Position the gear on the rear end of the crankshaft
with the flat finished hub of the gear facing toward
The crankshaft timing gear is bolted to the flange at the
the cylinder block and with all six bolt holes in the
rear end of the crankshaft and drives the camshaft gear
gear aligned with the tapped holes in the crankshaft.
(RA and RD engines) or balance shaft gear (RB and RC
One bolt hole is offset so the gear can be attached in
engines) through an idler gear.
only one position.
Since the camshaft must be in time with the crankshaft,
2. Align the proper timing mark ("R") on the crankshaft
timing marks are located on two teeth of the idler gear
gear tooth with the corresponding mark on the idler
with corresponding timing marks stamped on the
gear (refer to Section 1.7.1).
crankshaft gear and camshaft and balance shaft gears
(refer to Section 1.7.1).
NOTE: When advanced timing is required,
align the timing mark "A" with the timing mark
Remove Crankshaft Timing Gear (Flywheel Housing
on the idler gear.
Removed)
3. Start the six 3/8"-24 bolts with lock washers through
The crankshaft gear is a press fit on the crankshaft.
the gear and into the crankshaft. Then draw the
Remove the gear as follows:
gear tight against the shoulder on the crankshaft.
Tighten the bolts to 35-39 lb-ft (47-53 Nm) torque.
1. Remove the crankshaft rear oil seal sleeve, if used.
To remove the sleeve, peen the outside diameter of
4. Check the backlash with the mating gear. The
the sleeve until it stretches sufficiently so it can be
backlash should be .003 " to .008" with new gears or
slipped off of the crankshaft.
.010" maximum with used gears.
2. Before removing the crankshaft gear, align the timing
5. Install a new crankshaft rear oil seal sleeve, if
marks of the gear train and note their location so the
required, as outlined in Section 1.3.2.
gear can be reinstalled in its original position.
3. Remove the six bolts and lock washers securing the
gear to the crankshaft.
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