CAMPAIGN: ENGINE OIL COOLER OMITTED

General Motors has determined that some early production Chevrolet C-20 and C,K30 light duty trucks equipped with RPO LL4 (6.2 liter diesel engines) and RPO HC4 (4.56 ratio heavy duty rear axles) were assembled with the engine oil coolers omitted. The engine oil cooler is standard equipment on light trucks with this engine-axle combination. Absence of the engine oil cooler could decrease useful engine life.

VEHICLES INVOLVED

Involved are some 1982 Chevrolet C20 and C,K30 Trucks equipped with RPO LL4 (6.2L Diesel Engine) and RPO HC4 (4.56 ratio Heavy Duty Rear Axle) within the following vehicle parameters:

Plant From Through ---------- -------- -------- Janesville CJ101683 CJ128425

Involved vehicles have been identified by Vehicle Identification Number Computer Listings. Computer listings contain the complete Vehicle Identification Number, Owner Name and Address Data, and are furnished to the involved Dealers with the campaign bulletin. Owner name and address data furnished will enable dealers to follow-up with owners involved in this campaign.

These listings may contain owner names and addresses obtained from State Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing for the follow-up necessary to complete this campaign.

Any dealer not receiving a computer listing with the campaign bulletin was not shipped any involved vehicles.

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by Chevrolet Motor Division (see copy of Owner Letter included GSDI with this bulletin).

DEALER CAMPAIGN RESPONSIBILITY

This recall campaign is to be performed at no charge to owners on all affected vehicles regardless of time, mileage, or ownership. Dealers are to inspect and correct all affected vehicles in new and used vehicle stock prior to their sale.

Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made.

SERVICE PROCEDURE

1. Remove grille and front bumper.

2. Drill three (3) .199" +/- .004" diameter holes in radiator support (Refer to Figure 1).

3. Attach bracket P/N 14027387 to radiator support using three (3) sheet metal screws P/N 11502453.

4. Assemble two (2) brackets P/N 14026211 to radiator support using two (2) bolts P/N 473892. Do not tighten screws at this time.

5. Install cooler assembly P/N 3028541 to brackets using four (4) bolts P/N 9419000 and four (4) nuts PIN 3866846.

6. Tighten all screws and bolts to specified torque as shown in the illustrations.

7. Disconnect engine oil cooler hose lines from cooler pipes near radiator (Refer to Figure 2).

8. Connect the inlet hose that was just disconnected to the outlet pipe. (Refer to Figure 3).

9. Assemble the auxiliary cooler pipes P/Ns 14045667 and 14045668 to the auxiliary cooler and the inlet pipe and the outlet line using three (3) elbow fittings P/N 337941.

10. Tighten all connections to the specified torque. Use caution that threads are not cross-threaded.

11. Assemble clip assembly P/N 14036788 with bolt P/N 9433256.

12. Add approximately 3/4 pint of engine oil to engine.

13. Start engine. Idle engine for five (5) minutes. Check all connections for oil leaks. Increase and decrease engine speed a few times to increase oil pressure. Check for leaks.

14. Replace grille and bumper.

15. Install "Campaign Identification Label" according to the instructions contained in this bulletin.

PARTS INFORMATION

Parts to complete this modification are to be obtained from your Chevrolet Zone office. Parts will be furnished to the dealer on a no charge basis and are not to be ordered from or returned to WDDGM.

Quantity Part Number Description Per Veh. --------- -------------------- -------- 3028541 Cooler Asm-Engine Oil (1)

14026211 Bracket-Eng Oil (2) Cooler Upper

14027387 Bracket-Eng Oil (2) Cooler Lower

9419000 Bolt-Eng Oil Cooler (4)

3866846 Nut-Eng Oil Cooler (4)

11502453 Sheet Metal Screw (3)

473892 Bolt-Eng Oil (2) Cooler Bracket

337941 Fitting-Eng Oil (3) Cooler Hose

14045667 Pipe-Eng Oil (1) Cooler Inlet

14045668 Pipe-Eng Oil (1) Cooler Outlet

14036788 Clip-Eng Oil Cooler Pipe (1)

9433256 Bolt-Eng Oil Cooler (1) Pipe Clip

CLAIM INFORMATION

Submit a Product Claim with the information indicated below:

Parts Failed **Parts Failure Labor Labor *Other Count Part No. Allowance Code Operation Hours Hours ----- -------- --------- ------ --------- ----- ------ 25 3028541 28.28 00 V1290 1.3 .1

Description: Install Engine Oil Cooler Assembly.

*Campaign Administrative Allowance.

**30% of Dealer Net only for parts furnished at no charge by Chevrolet. In addition, dealers will be credited $1.35 for the engine oil required in making this repair, which includes the normal 30% dealer allowance.

Dealers will automatically receive the correct parts and labor allowance based on the Labor Operation performed.

Refer to the Chevrolet Claims Processing Manual for details on Product Campaign Claim submission.

CAMPAIGN IDENTIFICATION LABEL

Each Vehicle modified in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label". Each label provides a space to include the five digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ballpoint pen.

Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.

Apply "Campaign Identification Label" only on a clean dry surface.

ADMINISTRATIVE PROCEDURE

REFER TO THE CURRENT CHEVROLET SERVICE POLICIES AND PROCEDURES MANUAL AND CLAIMS PROCESSING MANUAL FOR CAMPAIGN HANDLING AND ADMINISTRATIVE PROCEDURES.

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.