SPECIAL POLICY:2.3L ENGINE CYLINDER HEAD GASKET LEAKAGE

---------------------------------------------------------------------- REVISION 01/19/94

THIS BULLETIN HAS BEEN REVISED TO CHANGE SERVICE PROCEDURE.

PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE: BUICK: 91-POL-2 CHEVROLET: 91-525-6A OLDSMOBILE: 91-T-244 PONTIAC: 91-SM-4 ----------------------------------------------------------------------

****************************************** NOTICE: THIS BULLETIN HAS SEVERAL AREAS THAT ARE DIVISIONAL SPECIFIC. BE SURE TO FOLLOW THE INSTRUCTIONS THAT APPLY TO YOUR DIVISION AND REFER TO YOUR DIVISIONS PUBLISHED BULLETIN. *****************************************

SPECIAL POLICY ADJUSTMENT - 2.3L ENGINE CYLINDER HEAD GASKET

1988-91 <L,N,W CARS> W/ 2.3L ENGINES

THIS BULLETIN CANCELS AND SUPERSEDES THE FOLLOWING DEALER TECHNICAL BULLETINS 91-428-6A WHICH SHOULD BE DISCARDED.

CHEVROLET 91-428-61 PONTIAC 91-6-54 BUICK 91-6B-3 OLDSMOBILE 91-T-209

CONDITION

GENERAL MOTORS HAS DETERMINED THAT SOME 1988-91 <L,N,W CARS> MODEL VEHICLES WITH 2.3L ENGINES (VIN CODES "A" (RPO LG0) AND "D" (RPO LD2) MAY DEVELOP A CONDITION OF THE CYLINDER HEAD GASKET WHICH ALLOWS COOLANT TO LEAK PAST THE HEAD GASKET INTO ONE OR MORE CYLINDERS. EARLY EVIDENCE OF THIS CONDITION WOULD BE A LOSS OF COOLANT RESERVOIR AND/OR "WHITE SMOKE" FROM THE TAIL PIPE.

TO CORRECT THIS CONDITION A NEW CYLINDER HEAD GASKET MUST BE INSTALLED USING THE INFORMATION AND PROCEDURE OUTLINED IN THIS REVISED BULLETIN.

VEHICLES INVOLVED

INVOLVED ARE SOME 1990-91 <DIVISION> L,N,W BODY VEHICLES WITH 2.3L ENGINES BUILT WITHIN THE FOLLOWING VIN BREAKPOINTS:

CHEVROLET VIN INFORMATION

BERRETTA GTZ WITH VIN CODE "A" (RPO LG0)

PLANT YEAR MODEL PLANT CODE FROM THROUGH

1990 L-CAR WILMINGTON "Y" LY100005 LY266135

1991 L-CAR WILMINGTON "Y" MY100001 MY246253

PONTIAC VIN INFORMATION

VIN CODES "A" (RPO LG0) AND "D" (RPO LD2)

UP TO AND YEAR MODEL BEGINING INCLUDING

1988 GRAND AM JC600002 JC835384 1989 GRAND AM KC600001 KC846424 1990 GRAND AM LC200001 LC397010 1990 GRAND PRIX LF200003 LF324805 1991 GRAND AM MC500001 MC678150 1991 GRAND PRIX MF200018 MF300379

BUICK VIN INFORMATION

VIN CODE "D" (RPO LD2)

THROUGH AND YEAR MODEL PLANT CODE FROM INCLUDING

1988 SKYLARK M JM000002 JM054799 1989 SKYLARK M KM000001 KM061525 1990 SKYLARK M LM000006 LM085479 1991 SKYLARK M MM200003 MM277330

OLDSMOBILE VIN INFORMATION

ENGINE YEAR MODEL MODEL NAME VIN CODE FROM THROUGH

1987 N CUTLAS CALAIS D HM222794 HM315582 1988-89 N CUTLAS CALAIS D S.O.P. E.O.P 1989 N CUTLAS CALAIS A KM282850 KM200103 1990-91 N CUTLAS CALAIS A OR D S.O.P. E.O.P. 1990-91 N CUTLAS SUPREME A OR D S.O.P. E.O.P.

NOTE: THIS POLICY APPLIES ONLY TO THOSE VEHICLES WITH 2.3L RPO LG0 AND RPO LD2 ENGINES (VIN CODE "A" AND "B").

S.O.P. MEANS START OF PRODUCTION AND E.O.P. MEANS END OF PRODUCTION.

SPECIAL POLICY ADJUSTMENT

THIS SPECIAL POLICY COVERS THE CONDITION DESCRIBED ABOVE FOR A PERIOD SIX YEARS OR 60,000 MILES, WHICHEVER OCCURS FIRST, FROM THE DATE THE VEHICLE WAS ORIGINALLY PLACED IN SERVICE, REGARDLESS OF OWNERSHIP. TH REPAIRS WILL BE MADE AT NO CHARGE TO THE OWNER. THIS SPECIAL POLICY ADJUSTMENT APPLIES ONLY TO REPAIRS REQUIRING HEAD GASKET REPLACEMENT A A RESULT OF THE HEAD GASKET LEAKING COOLANT INTO ENGINE CYLINDERS; IT DOES NOT COVER OTHER CONDITIONS WHICH MAY NECESSITATE REPLACEMENT OF T HEAD GASKET.

THIS SPECIAL POLICY ADJUSTMENT BULLETIN" SHOULD BE FILED IN YOUR "SPECIAL POLICY ADJUSTMENT BULLETINS" BINDER FURNISHED TO DEALERS BY GENERAL MOTORS.

OWNER REIMBURSEMENT

CUSTOMER CLAIMS FOR REIMBURSEMENT ON PREVIOUSLY PAID REPAIRS TO REPLAC THE CYLINDER HEAD GASKET AS A RESULT OF THE GASKET LEAKING COOLANT INT CYLINDERS, WERE TO BE SUBMITTED BY JUNE 30, 1993 FOR ALL STATES EXCEPT VIRGINIA, CONNECTICUT, AND WISCONSIN. VIRGINIA, CONNECTICUT, AND WISCONSIN OWNERS HAVE UP TO TWO (2) YEARS FROM THE DATE ON THE REPAIR ORDER TO SUBMIT FOR REIMBURSEMENT. REPAIRS MUST HAVE OCCURRED WITHIN SIX YEARS OF THE DATE THE VEHICLE WAS ORIGINALLY PLACED IN SERVICE, OR 60,000 MILES, WHICHEVER OCCURS FIRST. OWNERS MUST SUBMIT ORIGINAL DOCUMENTATION THAT REASONABLY CONFIRMS THE AMOUNT OF UNREIMBURSED REPA EXPENSE, A DESCRIPTION OF THE REPAIR, THE DATE OF THE REPAIR, AND THE PERSON OR ENTITY WHO PERFORMED THE REPAIR.

CLAIMS FOR CUSTOMER REIMBURSEMENT ON PREVIOUSLY PAID REPAIRS ARE TO BE SUBMITTED ACCORDING TO THE WARRANTY CLAIM INFORMATION INSTRUCTIONS. U THE "OWNER REIMBURSEMENT" LABOR OPERATION AND LIST ALL OWNER EXPENSES CONCERNING PREVIOUS REPAIRS IN THE NET ITEMS COLUMN OF THE WARRANTY CLAIM.

OWNER NOTIFICATION

OWNERS WILL BE NOTIFIED OF THIS SPECIAL POLICY BY <DIVISION> MOTOR DIVISION (SEE COPY OF OWNER LETTER INCLUDED WITH THIS BULLETIN).

DIAGNOSIS

NOTICE: THIS SERVICE PROCEDURE SUPERSEDES ALL PREVIOUS SERVICE BULLETINS AND INSTRUCTION SHEETS FOUND IN THE PART KITS.

THE FOLLOWING INSPECTIONS MAY BE PERFORMED TO VERIFY THAT THERE IS CONCERN WITH THE HEAD GASKET.

NOTICE: ONE OR MORE OF THE FOLLOWING FOUR (4) CONDITIONS LISTED BELOW MAY INDICATE A FAILED HEAD GASKET.

1. CONFIRM THAT THERE IS COOLANT LOSS WITH NO EXTERNAL LEAKS.

2. CHECK FOR BUBBLING IN THE COOLANT RECOVERY OR SURGE TANK.

3. WHITE SMOKE FROM EXHAUST SYSTEM WHEN VEHICLE IS AT NORMAL OPERATIN TEMPERATURE.

4. REMOVE SPARK PLUGS FROM A COOL ENGINE, REFER TO SECTION 6D4.

* INSPECT CYLINDER BY LOOKING THROUGH THE SPARK PLUG HOLE. WATER OR COOLANT IN THE CYLINDER OR A WASHED (CLEAN) PISTON MAY MEAN THERE IS A CONCERN WITH THE HEAD GASKET.

* REMOVE ECM FUSE AND CRANK ENGINE WITH SPARK PLUGS REMOVED. WAT OR COOLANT VAPOR COMING OUT OF THE SPARK PLUG HOLE MAY MEAN THERE IS A CONCERN WITH THE HEAD GASKET.

* INSPECT SPARK PLUGS. GREEN CONTAMINATION MAY INDICATE AN INTERNAL COOLANT LEAK.

5. IF STEPS 1 THROUGH 4 GIVE NO INDICATION OF A HEAD GASKET CONCERN, FILL THE COOLANT RECOVERY OR SURGE TANK. MARK AND DATE THE TANK A THE COOLANT LEVEL. RETURN VEHICLE TO THE OWNER. ASK THE CUSTOMER N TO ADD ANY COOLANT TO THE SYSTEM AND MONITOR THE COOLANT LEVEL. HA THE CUSTOMER RETURN THE VEHICLE TO THE DEALERSHIP IF THE COOLANT LEVEL IS LOW.

IMPORTANT: CONDENSATION IN THE OIL DOES NOT NECESSARILY INDICATE HEAD GASKET CONCERN IF THERE IS NO COOLANT LOSS. SOME CONDENSATION IN THE OIL MAY BE CONSIDERED NORMAL.

SERVICE PROCEDURE

1. COMPLETELY DRAIN THE COOLING SYSTEM.

IMPORTANT: THE CYLINDER BLOCK, HEAD, RADIATOR AND HEATER CORE MUS BE COMPLETELY DRAINED OF COOLANT SINCE THE OLD COOLANT WILL BE CONTAMINATED WITH COMBUSTION RESIDUE. REFER T THE APPROPRIATE SECTION OF YOUR SERVICE MANUAL FOR DRAINING PROCEDURE.

2. REMOVE THE CYLINDER HEAD. REFER TO THE APPROPRIATE SERVICE MANUAL SECTION.

3. INSPECT THE TIMING CHAIN TENSIONER SHOE, REFER TO FIGURE 1.

IMPORTANT: ON 1988 AND EARLIER VEHICLES, ALSO CHECK THE THICKNESS OF THE BACKING PLATE. IF THE THICKNESS IS 2 MM (0.079 IN.), REPLACE THE TENSIONER SHOE AND STUD WITH GM KIT P/N. 12340864. THE NEW TENSIONER SHOE BACKING PLATE WILL BE 3.7 MM (0.146 IN.) THICK, REFER TO FIGURE 1. G P/N 24570357 WILL BE AN UPDATED CHAIN WITH SMOOTH EDGE THAT WILL REDUCE TENSIONER SHOE WEAR.

FIGURE 1 - TIMING CHAIN TENSIONER SHOE

4. IF TENSIONER SHOE IS BROKEN AND THE CHAIN IS WORN FROM CONTACTING THE METAL SURFACE, USE GM KIT P/N 12340864 TO REPLACE THE TENSIONE SHOE AND STUD, P/N 24570357 TO REPLACE THE CHAIN AND P/N 24570356 REPLACE THE TENSIONER.

5. DISASSEMBLE, CLEAN AND INSPECT THE TENSIONER ASSEMBLY. BE SURE TO PAY SPECIAL ATTENTION TO THE OIL FEED AND DRAIN HOLES, REFER TO FIGURE 2. MAKE SURE THE OIL HOLES ARE FREE OF DIRT SO THEY WILL ALLOW PROPER OIL FLOW. IF THERE IS VARNISH IN THE TENSIONER BORE O ON THE PLUNGER THAT MAY CAUSE THE PLUNGER TO STICK IN THE BORE, LIGHTLY POLISH THE PLUNGER OR BORE WITH SCOTCH BRITE OR EQUIVALENT DO NOT USE ANY OTHER METHOD OR TECHNIQUE TO CLEAN THE PLUNGER OR BORE. SMOOTH SURFACES WILL ENSURE THE PLUNGER WILL NOT STICK IN TH BORE. IF THE PLUNGER STILL DOES NOT OPERATE SMOOTHLY USE GM P/N 24570356 TO REPLACE THE PARTS. STORE THE TENSIONER ASSEMBLY UNTIL IS NEEDED FOR ASSEMBLY IN A LOCATION (EX. THE PARTS CLEANER) WHERE DIRT WILL NOT GET INTO THE OIL HOLES. DO NOT USE ANY CLEANING MATERIAL OR METHOD THAT WILL REMOVE METAL FROM THE PLUNGER OR BORE

FIGURE 2 TENSIONER ASSEMBLY

6. INSPECT THE CYLINDER HEAD BOLTS FOR DAMAGED THREADS OR FOR DAMAGED HEADS CAUSED BY IMPROPER USE OF TOOLS. REPLACE HEAD BOLTS IF NECESSARY.

7. THOROUGHLY CLEAN THE CYLINDER HEAD AND BLOCK SURFACES AND CHECK FO FLATNESS.

NOTICE: DO NOT USE POWERED ABRASIVE PADS TO CLEAN THE CYLINDER HEA OR BLOCK SURFACES. A POWERED ABRASIVE PAD MAY DAMAGE THE CYLINDER HEAD AND BLOCK.

A. CAREFULLY REMOVE ALL GASKET MATERIAL. USE ONLY A PLASTIC OR WOO SCRAPER. USE LOCTITE BRAND "CHISEL GASKET REMOVER" (P/N 79040) PERMATEX BRAND "GASKET REMOVER" (P/N 4MA), OR EQUIVALENT. DO N USE ANY OTHER METHOD OR TECHNIQUE TO REMOVE GASKET MATERIAL.

IMPORTANT: DO NOT USE A TAP TO CLEAN THE HEAD BOLT HOLES.

B. CHECK CYLINDER HEAD FOR FLATNESS. REFER TO SERVICE MANUAL SECTI 6A7 FOR CYLINDER HEAD CHECKING PROCEDURE AND SPECIFICATIONS.

8. INSPECT THE CYLINDER HEAD SURFACE FOR CORROSION OR CRACKS. THE COMBUSTION SEAL AREA WILL LEAVE A "SHADOW" MARK ON THE CYLINDER HE (SHADED AREA - FIGURE 3). IF CORROSION IS EVIDENT OUTSIDE OF THE OUTSIDE DIAMETER (OD) OF THE COMBUSTION SEAL AREA, (SHADED AREA - FIG 3), THE CYLINDER HEAD MAY BE REUSED.

FIGURE 3 - CYLINDER HEAD INSPECTION AND CLEAN-UP

9. CLEAN EACH HEAD BOLT SEAT BOSS ON THE CYLINDER HEAD. CLEAN THE BO HOLES IN THE BLOCK, REFER TO FIG. 4. MAKE SURE THAT ALL PUDDLES O OIL AND COOLANT HAVE BEEN REMOVED FROM BOLT HOLES OTHERWISE THE TIGHTENING SEQUENCE WILL NOT OBTAIN THE PROPER CLAMP LOAD BECAUSE HYDRA-STATIC LOCK. IF THE BOLT HOLES ARE NOT CLEANED THE HEAD GASKET MAY LEAK.

FIGURE 4 - CLEAN BOLT HOLES IN BLOCK

10. REPLACE THE OIL FLOW CHECK VALVE (SEE FIGURE 5) IN 1987 THROUGH 19 MODEL YEAR VEHICLES. REFER TO THE APPLICABLE 1991 MODEL YEAR SERVICE MANUAL. THE CHECK VALVE DOES NOT NEED TO BE REPLACED IN 1990 OR NEWER VEHICLES OR THOSE VEHICLES WHERE THE CHECK VALVE HAS BEEN PREVIOUSLY REPLACED.

IMPORTANT: TO DETERMINE IF THE CHECK VALVE HAS BEEN PREVIOUSLY REPLACED ON 1987 THROUGH 1989 VEHICLES, SHINE A FLASHLIGHT INTO THE OIL CHECK VALVE. IF THERE ARE THREE DIMPLES IMMEDIATELY ABOVE THE CHECK BALL, IT IS THE NEW STYLE OIL FLOW VALVE AND SHOULD NOT BE REPLAC (FIGURE 5).

FIGURE 5 - OIL FLOW CHECK VALVE

11. APPLY CLEAN ENGINE OIL SPARINGLY TO THE THREADS AND THE BOTTOM SID OF THE FLANGE OF THE BOLT (FIGURE 6).

NOTICE: THE FOLLOWING TIGHTENING PROCEDURE MUST BE USED TO ASSUR GASKET LIFE. FAILURE TO FOLLOW THIS PROCEDURE EXACTLY M RESULT IN CYLINDER HEAD GASKET LEAKAGE.

FIGURE 6 - APPLY OIL SPARINGLY TO BOLT

FIGURE 7 - CYL. HEAD BOLT TIGHTENING SPEC. AND SEQUENCE

12. INSTALL AND TIGHTEN CYLINDER HEAD BOLTS TO THE NM (LBS. FT.) SPECIFICATION IN SEQUENCE. REFER TO STEP A IN FIGURE 7 FOR THE SPECIFICATION.

13. AFTER COMPLETING STEP 10 ON ALL TEN BOLTS, TIGHTEN ALL THE CYLIND HEAD BOLTS AN ADDITIONAL 90 DEGREES INDICATED IN STEP B OF FIGURE IN SEQUENCE USING J 36660.

14. REPLACE THERMOSTAT.

15. ASSEMBLE THE REST OF THE ENGINE, REFER TO APPROPRIATE SERVICE MANUAL.

16. CHANGE THE ENGINE OIL AND FILTER, BE SURE TO USE A PF 1225 OIL FILTER.

17. ADD (2) ENGINE COOLING SYSTEM SEALER PELLETS FROM PACKAGE, P/N 03634621, TO THE COOLING SYSTEM.

18. FILL THE COOLING SYSTEM. USE A MIXTURE OF WATER AND COOLANT MEETI GM SPECIFICATION 1825-M TO GET A PROTECTION LEVEL OF -37 DEGREES ( -34 DEGREES F) TO MAINTAIN SUFFICIENT ENGINE COOLING, FREEZING AND CORROSION PROTECTION. DO NOT USE A MIXTURE THAT HAS MORE THAN 70 PERCENT ANTI-FREEZE IN IT.

1987 - 88 MODEL/YEARS:

A. DISCONNECT HEATER INLET HOSE FROM ENGINE COOLANT OUTLET. B. REMOVE PRESSURE CAP FROM RADIATOR AND FILL WITH COOLANT UNTIL COOLANT DRAINS FROM THE ENGINE COOLANT OUTLET.

IMPORTANT: THIS PROCESS MAY TAKE UP TO 15 MINUTES.

C. RECONNECT HEATER HOSE TO ENGINE COOLANT OUTLET. D. START ENGINE. E. CONTINUE TO FILL RADIATOR AS COOLANT LEVEL DROPS UNTIL THE RADIATOR HOSE AT THE RADIATOR INLET IS HOT AND COOLANT LEVEL I RADIATOR BECOMES STABLE. F. FILL RADIATOR COMPLETELY. G. INSTALL PRESSURE CAP. H. STOP ENGINE.

1989 - 91 MODEL/YEARS:

A. REMOVE THE TOP RADIATOR HOSE FROM THE RADIATOR PRIOR TO REFILLING THE COOLANT. B. FILL THE COOLANT SYSTEM UNTIL COOLANT APPEARS AT THE RADIATOR INLET. C. RE-INSTALL THE TOP RADIATOR HOSE TO THE RADIATOR INLET AND CONTINUE FILLING SURGE TANK TO THE BASE OF THE FILLER NECK.

PARTS INFORMATION

PARTS ARE TO BE OBTAINED FROM GENERAL MOTORS SERVICE PARTS OPERATIONS (GMSPO). TO ENSURE THESE PARTS WILL BE OBTAINED AS SOON AS POSSIBLE, THEY SHOULD BE ORDERED FROM GMSPO ON A "C.I.O." ORDER WITH NO SPECIAL INSTRUCTION CODE, BUT ON AN ADVISE CODE (2).

QUANTITY/ PART NUMBER DESCRIPTION VEHICLE

12354854 GASKET KIT, CYLINDER HEAD 1

03634621 ENGINE COOLANT SYSTEM SEALER 2 PELLETS

(PACKAGE OF 6)

12340864 TENSIONER SHOE AND STUD 1 (IF REQUIRED)

01052754 ENGINE COOLANT 5 QUARTS

25014233 OIL FILTER, ENGINE (PF1225) 1

12345612 OIL, ENGINE (SAE 5W-30) 4.25 QUARTS

NOTICE: THE CYLINDER HEAD GASKET KIT (P/N 12354854) CONTAINS A CHECK VALVE WHICH WILL BE USED ONLY ON 1988-1989 VEHICLES.

VIDEO TRAINING TAPE

EACH DEALERSHIP WILL BE SENT ONE VIDEO TRAINING TAPE ON THE SUBJECT OF QUAD 4 HEAD GASKET REPAIR AT NO CHARGE. THE VIDEO WILL BE MAILED BY EARLY SEPTEMBER 1993.

CLAIM INFORMATION

CHEVROLET

SUBMIT A CLAIM WITH THE INFORMATION INDICATED ON THE FOLLOWING PAGE: CLAIM INFORMATION (CON'T) _____________________________________________________________________ ** * FAILED PARTS CC-FC LABOR LAB N REPAIR PERFORMED PC PART NO. ALLOW OP HRS A _____________________________________________________________________

REPLACE HEAD GASKET 14 12354854 * SK-00 T4681 7.6 $# _____________________________________________________________________

REIMBURSEMENT FOR PRIOR HEAD GASKET - - - - - SK-00 T4682 0.2 $# REPLACEMENT _____________________________________________________________________

* THE "PARTS ALLOWANCE" SHOULD BE THE SUM TOTAL OF THE CURRENT GMSPO DEALER NET PRICE PLUS 30% OF ALL PARTS REQUIRED FOR THE REPAIR. THE CORRECT DOLLAR AMOUNT FOR ENGINE OIL ENGINE OIL FILTER AND ENGINE COOLANT IS INCLUDED IN THIS ALLOWANCE.

** THE 7.6 "LABOR HOURS" SHOWN INCLUDES TIME (0.1 HRS.) FOR REMOVING WHEEL LOCK NUTS, CHANGING ENGINE OIL AND FILTER, AND ALSO REPLACEMENT OF TIMING CHAIN TENSIONER SHOE AND STUD, IF NECESSARY. ADDITIONALLY, THE FOLLOWING "ADD-TIMES" MAY BE SELECTED WHEN APPLICABLE:

ITEM ADD H

CLEAN PARTS FOR VEHICLES OVER 30,000 MILES 0.4

REPLACE CYLINDER HEAD 1.

*** THE $#.## IDENTIFIED IN THE "NET AMOUNT" COLUMN SHOULD BE USED TO REPRESENT THE DEALER COST PLUS 30% FOR CYLINDER HEAD REPLACEMENT (IF REQUIRED).

BUICK, PONTIAC, OLDSMOBILE

_____________________________________________________________________ ** * FAILED PARTS FAILURE LABOR LAB N REPAIR PERFORMED PC PART NO. ALLOW CODE OP HRS A _____________________________________________________________________ BUICK REPLACE HEAD GASKET 12354854 * 95 T4681 7.2 $#.

PONTIAC, OLDSMOBILE GRAND AM, CUTLASS CALAIS REPLACE HEAD GASKET * 95 T4681 7.2 $#. GRAND PRIX, CUTLASS SUPREME REPLACE HEAD GASKET * 95 T4681 6.3 $#.

ADD TIMES:

W/LOCKING WHEEL COVERS/NUTS (ONE OR ALL) 0.1 CLEAN PARTS ON VEHICLES OVER 30,000 MILES 0.4 (IF NECESSARY REPLACE CYLINDER HEAD (IF NECESSARY) 1.4

PARTS ALLOWANCE: CURRENT DEALER PRICE, PLUS 30% HANDLING ALLOWANCE.

CUSTOMER REIMBURSEMENT (PONTIAC ONLY) PRIOR HEAD GASKET - - - - - 95 T4682 0.2 REPLACEMENT

* 0.2 FOR CLERCAL ADMINISTRATION MAY BE APPLIED FOR IN THE OTHER LABOR HOURS ON CUSTOMER REIMBURESMENTS CLAIMS TOTALING $300.00 OR LESS.

CUSTOMER REMBURSEMENT (BUICK AND OLDSMOBILE) SEE YOU DIVISIONS PUBLISHED COPY FOR SPECIAL INSTRUCTIONS.

DEALERS WILL AUTOMATICALLY RECEIVE THE CORRECT LABOR AND MATERIAL ALLOWANCE BASED ON THE LABOR OPERATION PERFORMED.

REFER TO THE <DIVISION> CLAIMS PROCESSING MANUAL FOR DETAILS ON CLAIM SUBMISSION.

COPYRIGHT 1993 <DIVISION> MOTOR DIVISION GENERAL MOTORS CORPORATION ALL RIGHTS RESERVED

FIGURES: 0

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELF." THEY ARE WRITTEN TO INFORM THESE 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 HAS THAT CONDITION. SEE YOUR <DIVISION> DEALER FOR INFORMATION ON WHETHER YOUR VEHICLE MAY

BENEFIT FROM THAT INFORMATION.

SAMPLE OWNER LETTER -- CHEVROLET

REFER TO YOUR DIVISIONS PRINTED BULLETIN FOR DIVISIONAL SPECIFIC INFORMATION. ------------------------------------------------------- JANUARY 29, 1993

DEAR 1991 CHEVROLET BERETTA GTZ OWNER:

AS THE OWNER OF A 1991 CHEVROLET BERETTA GTZ EQUIPPED WITH A 2.3L ENGINE, YOUR CONTINUED SATISFACTION WITH OUR PRODUCT IS OF UTMOST CONCERN TO US. YOUR VEHICLE WAS PROVIDED WITH A NEW VEHICLE WARRANTY WHICH COVERS CERTAIN PARTS OF YOUR VEHICLE FOR A SPECIFIED PERIOD. THESE WARRANTIES ARE OF CONSIDERABLE VALUE TO YOU IF YOU EXPERIENCE PROBLEMS WITH YOUR VEHICLE.

THIS LETTER IS INTENDED TO MAKE YOU AWARE THAT SOME 1991 CHEVROLET BERETTA GTZ MODEL VEHICLES BUILT WITH 2.3L ENGINES MAY DEVELOP A CONDITION OF THE CYLINDER HEAD GASKET WHICH ALLOWS COOLANT TO LEAK PAST THE HEAD GASKET INTO ONE OR MORE CYLINDERS. EARLY EVIDENCE OF THIS CONDITION WOULD BE A LOSS OF COOLANT IN THE COOLANT RESERVOIR AND/OR "WHITE SMOKE" FROM THE TAIL PIPE.

IF THE ABOVE CONDITION OCCURS WITHIN SIX YEARS OF THE DATE YOUR VEHICLE WAS ORIGINALLY PLACED IN SERVICE, OR 60,000 MILES, WHICHEVER OCCURS FIRST, YOUR VEHICLE WILL BE REPAIRED FOR YOU FREE OF CHARGE, INCLUDING WAIVING OF ANY DEDUCTIBLE THAT MIGHT NORMALLY APPLY.

IF YOU HAVE ALREADY EXPERIENCED THIS CONDITION, AND YOU HAVE PAID TO HAVE IT REPAIRED, YOU SHOULD CONTACT YOUR CHEVROLET DEALER TO SEEK REIMBURSEMENT. CONNECTICUT, WISCONSIN AND VIRGINIA RESIDENTS MUST WRITE TO CHEVROLET MOTOR DIVISION, CUSTOMER ASSISTANCE CENTER, P.O. BOX 7047, TROY, MI 48007- 7047, FOR REIMBURSEMENT. IN EITHER SITUATION, PLEASE PROVIDE YOUR ORIGINAL PAID RECEIPTS OR INVOICES VERIFYING THE REPAIR, THE AMOUNT CHARGED, PROOF OF YOUR PAYMENT AND DATE OF PAYMENT OF THOSE CHARGES. THIS INFORMATION MUST BE PROVIDED BY JUNE 30, 1993 (THIS TIME LIMITATION FOR PRESENTING THE ORIGINAL PAID RECEIPT MAY BE LONGER DEPENDING UPON THE LAW IN YOUR STATE).

IF YOUR VEHICLE HAS NOT EXPERIENCED THIS CONDITION, DO NOTHING AT THIS TIME. JUST PLACE THIS LETTER IN THE GLOVE BOX WITH YOUR OWNER'S MANUAL AND OTHER WARRANTY INFORMATION IN CASE YOU SHOULD NEED TO TAKE ADVANTAGE OF THIS POLICY IN THE FUTURE. IF YOU SELL OR TRADE YOUR CAR ANYTIME DURING THIS ADDITIONAL WARRANTY PERIOD, PLEASE LEAVE THE INFORMATION WITH THE OWNER'S MANUAL SO THE NEW OWNER WILL BE AWARE OF ELIGIBILITY DURING THE UNEXPIRED PORTION OF THE COVERAGE.

SHOULD YOU HAVE ANY QUESTIONS REGARDING THIS ACTION, PLEASE FEEL FREE TO CALL US. OUR TOLL FREE NUMBER IS 1-800-222- 1020, AND ONE OF OUR CUSTOMER ASSISTANCE SPECIALISTS WILL BE HAPPY TO ANSWER ANY QUESTIONS YOU MAY HAVE.

WE REGRET ANY INCONVENIENCE THAT YOU MAY EXPERIENCE; HOWEVER, WE HAVE TAKEN THIS ACTION IN THE INTEREST OF YOUR CONTINUED SATISFACTION WITH OUR PRODUCTS.

CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION

ENCLOSURE