CAMPAIGN: MAIN BEARING CAP BOLTS MAY BREAK

CONDITION

General Motors has determined that some 1983 Firenza models equipped with 1.8 liter Electronic Fuel Injection/Overhead Cam Engines may have been assembled with incorrect engine main bearing cap bolts. In some cases, the main bearing cap bolts could break. This could cause extensive damage to the engine crankshaft.

To prevent this from oocurring, dealers are to inspect vehicles for specific engine identification and, if necessary, replace the engine main bearing cap bolts.

VEHICLES INVOLVED

Involved are some 1983 Firenza models equipped with 1.8L Overhead Cam EFI 4-cylinder engine (Option Cods LH8) built within the following breakpoints:

BEGINNING PLANT VIN UP TO & INCLUDING ----- --- ---------------- 1983 Firenzas LEEDS DK315718 DK316363

DEALER ACTION

Dealers are to inspect the vehicle for specific engine serial number and identification and, if necessary, replace the engine main bearing cap bolts.

Dealers are to service all vehicles subject to this campaign at no charge to owner, regardless of mileage, age of vehicles, or ownership, from this time forward.

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 before reselling or releasing the vehicle.

SERVICE PROCEDURE

1. Open hood.

2. Inspect engine identification paper tag located on engine timing cover. If the engine identification tag is missing, the engine identification number is engraved on a horizontal boss located on the cylinder block, directly underneath number (4) spark plug.

3. If engine serial number is between 77117 and 83420, proceed to Step 5. Replacement of ten (10) engine main bearing cap bolts is needed.

4. If engine serial number in not between 77117 and 83420, vehicle passes inspection and no repair is needed. Proceed to Step 19.

Main Bearing Replacement

5. Hoist vehicle. If a twin post hoist is being used, position jackstand at vehicle jacking points and lower post.

6. Drain oil from crankcase.

7. Remove axhaust pipe from exhaust manifold.

8. If equipped with air conditioning, remove lower air conditioning strut bracket.

9. Remove flywheel dust shield.

10. Remove oil pan. Side the oil pan forward, then downward to clear the oil pump pickup tube.

11. Inspect for broken bolts, and then replace the ten (10) main bearing cap bolts. Torque new main bearing cap bolts to 77 N.m (57 lb. ft.).

11a. If any broken bolts are found in the No. 1, No. 2, No. 3 or No. 4 main bearing positions, remove the main bearing cap and inspect the bearing.

11b. If any main bearings appear to be damaged or have spun, replace the bearing.

11c. If a broken bolt is found in the No. 5 main bearing position; visually inspect the cap to determine whether the bearing has moved. If the bearing cap has not moved replace the bearing cap bolts only.

11d. If removal of No. 5 main bearing cap is necessary, the area requiring sealer must be cleaned and resealed using dealer kit GM No. 3997597. Refer to illustration in the 1983 Front Wheel Drive Service Manual, Section 6A2, Figure 6A2-38. Be sure the rear main oil seal is properly aligned.

11e. If the engine has been damaged as a result of a spun bearing, replace the engine block.

12. Install oil pan and new oil pan gasket. Apply RTV sealer to oil pan gasket at the oil pump mating surface.

13. If equipped with air conditioning install air conditioning strut bracket.

14. Install flywheell dust shield.

15. Install exhaust pips to exhaust manifold.

16. Lower vehicle.

17. Refill crankcase with oil.

18. Start engine and check for oil leaks.

19. Install campaign correction label as follows: Record the campaign number 83-C-3, dealer code and date on the blank campaign correction label and install on the radiator baffle where it is readily visible.

PARTS INFORMATION

Campaign requirements of part number 11072446 (bearing bolts - 10 per vehicle) are to be obtained by the dealer from WDDGM.

The removed parts are to be retained for disposition by zone personnel.

Very few vehicles will need replacement of engine main bearing cap bolts.

WARRANTY INFORMATION

All dealers USING the terminal submission system are to submit campaign claims using their terminal. All other dealers are to submit campaign claims using the "yellow strip" campaign cards. See Page 59 of the Oldsmobile Claims Preparation Manual.

*PARTS LABOR DESCRIPTION PART COUNT ALLOWANCE LABOR OP TIME ----------- ---------- --------- -------- ---- Inspect Engine 0 0 V1580 0.2

Inspect Egine & Replace 10 Engine Bolts With A/C 0 $15.87 V1581 1.6 Without A/C 0 $15.87 V1582 1.4

If it is necessary to replace ONE of the main bearings (no. 1, 2, 4 or 5) submit the claim as shown.

Inspect Engine & Replace 10 Engine Bolts & One Main Bearing (No. 1, 2,4 or 5) With A/C 1 $29.85 V1583 1.8 Without A/C 1 $29.85 V1584 1.6

Increase the part count by one for each additional no. 1, 2, 4 or 5 main bearing replacement, increase the parts allowance for each additional bearing replaced and increase the time allowance by .2 hr. for each additional bearing replaced.

If it is necessary to replace the main no. 3 bearing submit the claim as shown.

Inspect Engine & Replace 10 Engine Bolts & One Main no. 3 bearing With A/C 5 $41.01 V1583 1.8 Without A/C 5 $41.01 V1584 1.6

If it is necessary to replace the no. 3 main bearing and ONE of the no. 1. 2,4 or 5 bearings submit the claim as shown.

Inspect Engine & Replace 10 Engine Bolts & No. 3 Main Bearing & One of the (No. 1, 2, 4 or 5) Bearings, With A/C 6 $54.99 V1583 2.0 Without A/C 6 $64.99 V1584 1.8

Increase the part count by one for each additional main bearing replacement, increase the parts allowance for each additional bearing replaced and increase the time allowance by .2 hr. for each additional bearing replaced.

** Parts credit is for dealer price of oil pan gasket, Part number 90106425, ($3.61) plus 30% ($1.08) and three (3) quarts of engine oil ($4.50) plus 30% ($1.35). Main bearing cap bolts are included in above parts allowance examples.

Add 0.2 Hr. for each additional main bearing replacement.

.1 hour for clerical administration will be added to the above operations.

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.