REPAIR INSTRUCTIONS
Page 169
CAMSHAFT GEAR REMOVAL
An extremely tight interference fit holds the cam
gear on the camshaft. Typically, 10 tons of force
is required to remove the gear. When cam gear
removal or installation is required, use the
following procedures.
A considerable amount of force may be
necessary to remove damaged or spun gears.
DO NOT apply more than 25 tons (22.7 metric
tons) of force to gears. Doing so may shatter
the gears and result in severe personal injury.
Refer to Figure 161.
1. Position two adequate steel plates on the
press to support the camshaft gear. The
plates should have a 4-inch (101.6-mm) hole
cut out in the center when placed side-by-
side, or similar size v-grooves, to allow
clearance for the shaft journals and greater
support for the gear.
2. Set camshaft, supported by the gear, into
the press.
3. Using a suitable arbor, press the camshaft
out of the camshaft gear.
Some engines use a straight key while others use
an offset key positioned to the right or left
depending on the engine model. If an offset key is
used, be sure to note the positioning of the key so
that it can be reinstalled in the same position.
Make sure there is enough clearance between
the end of the camshaft and the floor while
removing the gear. Do not let the camshaft fall or
strike the floor when pressed from the gear. The
camshaft can be bent easily, and may go
unnoticed. Installing a bent camshaft in the
engine could result in cam bushing failure.
4. Remove the thrust washer.
161
Figure 161 — Camshaft Gear Removal
INSPECTION
Refer to Figure 162.
1. Thoroughly clean the camshaft (3).
Use magnaflux (PT7190) inspection procedure to
detect cracks.
2. Inspect the camshaft lobes and journals for
evidence of cracks, pitting, scoring or severe
wear. If any of these conditions exist,
replace the camshaft.
3. Inspect the camshaft gear (1) and camshaft
captured thrust washer (2) for cracks, pitting,
scoring or adverse wear.
4. Visually inspect the key (4) for signs of
distortion or breakage.
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