RADIATOR GRILLE MOUNTING TABS CRACK OR BREAK OFF

GRILLE MOUNTING TABS CRACK

VEHICLES AFFECTED: 1983-1986 C/K Trucks -----------------

Some 1983-1986 C/K Trucks may experience a condition where the grille mounting tabs exhibit cracks or break off. To address this condition, the valance panel and radiator grille assembly have been revised interim 1986. The changes incorporated in these parts will allow for the expansion and contraction of the grille assembly due to temperature changes. The revised valance panel and radiator grille assembly were changed in production beginning with the following vehicle identification breakpoints.

Assembly Plate Chev GMC -------------- ---- ---

Janesville GJ118379 GJ506647 Flint GF117310 GF505772 Oshawa G1131130 G1512525 St. Louis GS125193 GS507791

The valance panel on affected 1983-1986 C/K Trucks can be modified by slotting the two outboard grille mounting holes following the service procedure below.

Refer to the attached parts list for the revised assemblies.

SERVICE PROCEDURE

1. Remove the headlamp bezels and grille. Discard the grille assembly if cracked or broken.

2. Remove the plastic nut from the two outboard mounting holes of the front valance panel (See Figure No. 1).

3. Use a nibbling tool to slot the two outer valance panel holes .1 inch on each side, in the cross vehicle direction (See Figure No. 1). This will change the square .3 x .3 inch hole to a rectangular .3 x .5 inch hole.

4. Paint exposed steel edges as required to prevent corrosion.

5. Reinstall the plastic nuts. Install the appropriate grille assembly and nuts from part numbers listed. Reinstall the headlamp bezels.

PARTS INFORMATION

Model Part Numbers Year Chev GMC Description Quantity ----- ---- --- ----------- --------

1983-84 14043881 14043871 Grille - Dark Argent 1 Insert - Requires Bright Mouldings

1983-84 14043877 14043847 Grille - Light Argent 1 Insert - No Moundings

1985-86 15554910* 15554913 Grille - Colour Coat 1 to Match

1983-86 3919773 3919773 Plastic Nuts 5

* Must also order Chev Emblem P/N 14043879.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.