CRANKSHAFT TIMING GEAR
Remove the six bolts and lock washers securing
the gear to the crankshaft.
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
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.
Fig. 1. Removing Crankshaft Timing Gear
The crankshaft timing gear is bolted to the flange at the
Install Crankshaft Timing Gear
rear end of the crankshaft and drives the balance shaft
gear through an idler gear.
Position the gear on the rear end of the crankshaft
with the flat finished hub of the gear facing toward the
Since the camshaft must be in time with the crankshaft,
cylinder block and with all six bolt holes in the gear
timing marks are located on two teeth of the idler gear
aligned with the tapped holes in the crankshaft. One
with corresponding timing marks stamped on the
bolt hole is offset so the gear can be attached in only
crankshaft gear and camshaft and balance shaft gears
Align the proper timing mark ("R") on the
Remove Crankshaft Timing Gear (Flywheel Housing
crankshaft gear tooth with the corresponding mark on
The crankshaft gear is a press fit on the crankshaft.
Start the six 3/8" -24 bolts with lock washers
Remove the gear as follows:
through the gear and into the crankshaft. Then draw the
gear tight against the shoulder on the crankshaft.
Remove the crankshaft rear oil seal sleeve, if
Tighten the bolts to 35-39 lb-ft (47-53 Nm) torque.
used. To remove the sleeve, peen the outside diameter
of the sleeve until it stretches sufficiently so it can be
Check the backlash with the mating gear. The
slipped off of the crankshaft.
backlash should be .003 " to .008" with new gears or
.010 " maximum with used gears.
Before removing the crankshaft gear, align the
timing marks of the gear train and note their location so
Install a new crankshaft rear oil seal sleeve, as
the gear can be reinstalled in its original position.