Engine Mountings - GMC G Service Manual

Clean
q
• Mating surfaces of crankshaft and flywheel. Remove
any burrs.
Inspect
• Flywheel for burning, scoring, warping and wear.
Replace the flywheel if necessary. Do not machine
the flywheel.
• Flywheel ring gear for worn or broken teeth.
Flywheel Ring Gear Replacement
1. Use a torch to heat the gear around the entire circum­
ference, then drive the gear off the flywheel, using
care not to damage the flywheel.
NOTICE: Never heat starter gear to red heat as
this will change the metal's structure.
2. Uniformly heat the flywheel gear to temperature
which will expand the gear to permit installation. Tem­
perature must not exceed 204 degrees C (400
degrees F).
3. As soon as the gear has been heated, install on the
flywheel.
Install or Connect
1. Flywheel.
2. Flywheel bolts.
IC il Tighten
• Flywheel bolts to 100 N»m (75 ft. lbs.).
A. Torque Bolt to 100 N m (75 ft. lbs.).
Or, Torque Nut to 68 N m (50 ft. lbs.)
B. 48 N m (36 ft. lbs.)
C. 40 N m (30 ft. lbs.)
D. Forward
3. Clutch, flywheel housing and transmission. Refer to
NOTICE: Broken or deteriorated mountings can
cause misaligned and eventual destruction of
certain drive train components. When a single
mounting breakage occurs, the remaining
mountings are subjected to abnormally high
stresses.
INSPECTING ENGINE MOUNTINGS
Front Engine Mountings
NOTICE: When raising or supporting the engine
for any reason, do not use a jack under the oil
pan, any sheet metal or crankshaft pulley. Due
to the small clearance between the oil pan and
the oil pump screen, jacking against the oil pan
may cause It to be bent against the pump
screen, resulting in a damaged oil pickup unit.
1. Raise the engine to remove weight from the mount­
2. Replace the mounting if the following conditions exist:
Figure 36 — Front Engine Mounting
4,3 LITER V6 6A3-25
TRANSMISSION AND CLUTCH (SEC. 7).

ENGINE MOUNTINGS

ings and to place a slight tension on the rubber cush­
ion. Observe both mountings while raising the engine.
• Hard rubber surface covered with heat check
cracks.
• Rubber cushion separated from the metal plate
of the mounting.
• Rubber cushion split through the center.
B-07618