C 1500 Truck 2WD V6-262 4.3L VIN Z (1992)
12 through 14 in the "in-vehicle" service outlined above.
11.
Reinstall the upper main bearing.
12.
Reinstall the main cap and lower bearing; torque to 110 N.m (80 lb ft).
13.
Repeat for each main bearing.
14.
Reinstall oil pump and shield; torque to 88 N.m (65 lb ft).
15.
Reinstall dipstick tube.
16.
Reinstall oil pan.
17.
Reinstall engine in vehicle.
18.
Before starting the engine, remove the fuel pump fuse and crank the engine until oil pressure registers on the gauge. Stop cranking, let the starter
cool down, then crank for another 15 seconds.
19.
Install fuel pump fuse, start engine, check for leaks or unusual noises.
20.
Road test vehicle, check for leaks or unusual noises.
Correction
Category B: Valve Train Clatter, Tick or Click
For 1992-94 vehicles equipped with a 4.3L V6 (LB4 VIN Z or L35 VIN W) engine see Corporate Bulletin 376006 for information on converting from
net lash to adjustable lash and/or re-lashing the valves on an adjustable lash system.
Investigation of "cold knock" is continuing. Updates will continue to be provided when available.
Parts Information
Check-Valve Filters Description
Part Number
V6, V8 (Four-Wheel Drive) FRAM PH3980
12555891
V8 (Two-Wheel Drive), Mark V8 PF1218
25160561
The FRAM PH3980 is to be used in place of the
PF52. The PH3980 provides superior anti-drainback
performance, a key factor in reducing cold knock.
FRAM filters are to be procured locally until
08-15-95. After this date the filters may be ordered
from GMSPO using the supplied part number. Orders
placed to GMSPO prior to this date will not be
placed on backorder.
Bearings Description
Part Number
0.001" Main Bearing Kit, Positions 1-4 on V8, 1-3 on V6
10120992
0.001" Main Bearing Kit, Flange # 5 on V8, # 4 on V6
10120994
0.002" Main Bearing Kit, Positions 1-4 on V8, 1-3 on V6
12329758
0.002" Main Bearing Kit, Flange # 5 on V8, # 4 on V6
12329792
Main bearing kits are currently available from GMSPO.
All calibrations are currently available from GMSPO.
