Pickup Box - OIl Canning Noise
Number: 88-15Section: 10 - Body Section
Date: April, 1987
Subject PICKUP BOX "OIL CANNING"
Model and Year 1988 C/K
FIGURE NO. 1:
Some 1988 C/K models may develop an "oil canning" sound from the pickup box area. This sound may be caused by welds separating between the pickup box bed and cross sill areas (See Figure No. 1). There are six cross sills in total. The condition can be verified by walking across the bed and listening for the oil canning sound or by visually looking for separated welds from under the vehicle. To repair this condition, the following procedure should be used:
^ Drill each affected spot weld with a 5/16" drill bit.
Note: Do not drill through cross sill.
^ Clean the area between the bed and cross sill of dirt.
^ Sand or grind around each spot weld affected to remove all paint from an area 1/2" around the weld.
^ Mig weld each drilled area using .023" diameter steel wire.
^ Grind each weld smooth.
^ Refinish the affected areas.
Vehicles built between the following VIN breakpoints may be affected by this condition.
OSHAWA
GMC 2GTCC14K2J1500396
2GTDK14K7J1500630
Chevrolet 2GCDC14Z5J1101161
2GCDC14Z7J1102358
PONTIAC EAST
GMC 1GTDC14H8JE5002952
1GTDK14HXJE5003962
Chevrolet 1GCDC14Z2JE1006931
1GCDC14K4JE1013771
FORT WAYNE
GMC 1GTDC14H3JZ500150
1GTDC14H9JZ500332
Chevrolet 1GCDC14Z1JZ100502
1GCDC14HXJZ100943