Oil Filter Adapter And Oil Filter Bypass Valve Replacement (Models With Engine Oil Cooler); Crankshaft Replacement; Flywheel Replacement - GMC G Service Manual

6A3-24 4.3 LITER V6
• Tighten the rear main bearing cap bolts to
110 N»m (80 ft. lbs.).
• With the crankshaft forced forward, mea­
sure at the front end of the rear main bear­
ing with a feeler gage (figure 34). The
proper clearance is 0.002-0.006-inch.
• If correct end play cannot be obtained, be
certain that the correct size rear main
bearing has been installed. Production
engines may have rear main bearings that
are 0.008-inch wider across the thrust
faces than standard. Refer to the proper
Unit Repair Manual for more information.
8. Oil pump. Refer to "Oil Pump Replacement" in this
section.
9. Oil pan. Refer to "Oil Pan Replacement" in this
section.
10. Spark plugs.
Forward
A.
Feeler Gage
B.
100
Rear Main Bearing Cap
.
101
Crankshaft
.
Figure 34 — Measuring Crankshaft End Play
OIL FILTER ADAPTER AND OIL
FILTER BYPASS VALVE
REPLACEMENT (MODELS WITH
ENGINE OIL COOLER)
R Remove or Disconnect (Figure 35)
1. Oil filter.
V F l Inspect
• Bypass valve spring and fiber valve for proper
operation, cracks or other damage. If replace­
ment is required, the bypass valve and oil filter
adapter must be replaced as an assembly, as
outlined below.
2. Oil cooler lines.
3. Bolts (93).
4. Oil filter adapter (92).
5. Gasket (91) and seal (90).
M Install or Connect (Figure 35)
1. New gasket (91), new seal (90) and oil filter adapter
(92) to the block.
2. Bolts (93).
I & l Tighten
• Bolts (93) to 20 N«m (15 ft. lbs.).
3. Oil cooler lines.
4. Oil filter.
• Add engine oil as needed. Refer to MAINTENANCE
AND LUBRICATION (SEC. 0B) and Owner's Manual.

CRANKSHAFT REPLACEMENT

1. Remove the engine. Refer to "Engine Replacement"
in this section.
2. Refer to the proper Unit Repair Manual for crankshaft
replacement procedures.
B-07878

FLYWHEEL REPLACEMENT

h 4! Remove or Disconnect
1. Transmission, flywheel housing and clutch. Refer to
TRANSMISSION AND CLUTCH (SEC. 7).
2. Flywheel bolts.
3. Flywheel.