CAMPAIGN: WATER PUMP PULLEY (INSPECT DATE CODE)

1988 AB EQUIPPED WITH 2.5L ENGINE (RPO LR8, VIN CODE R)

GENERAL MOTORS HAS DETERMINED THAT CERTAIN 1988 AB MODEL VEHICLES EQUIPPED WITH A 2.5L ENGINE MAY HAVE BEEN PRODUCED WITH A WATER PUMP PULLEY THAT COULD FRACTURE. THIS COULD RESULT IN LOSS OF ACCESSORY DRIVE COMPONENTS INCLUDING POWER STEERING ASSIST, GENERATOR AND WATER PUMP. THE ENGINE WILL CONTINUE TO RUN, BUT THE DRIVER WOULD BE WARNED OF THE FAILURE BY ONE OR MORE OF THE FOLLOWING CONDITIONS:

A. SIGNAL BY GENERATOR LIGHT OR GAGE OF LOSS OF VOLTAGE.

B. LIKELIHOOD OF NOISE AT TIME OF FAILURE.

C. SIGNAL BY TEMPERATURE LIGHT OR GAGE IF ENGINE OVERHEATS.

D. LOSS OF POWER STEERING ASSIST.

TO PREVENT THIS CONDITION FROM OCCURRING, DEALERS ARE TO INSPECT THE WATER PUMP PULLEY DATE CODE ON ALL INVOLVED VEHICLES, AND REPLACE PULLEYS AS REQUIRED.

VEHICLES INVOLVED

INVOLVED ARE CERTAIN 1988 AB MODEL VEHICLES EQUIPPED WITH A 2.5L ENGINE AND PRODUCED WITHIN THE FOLLOWING VIN BREAKPOINTS:

DIVISION BULL. NUM. YEAR PLANT FROM THROUGH

CHEVROLET 88C16 1988 FRAMINGHAM JG100001 JG110586

" " " OKLAHOMA CITY J6114038 J6186449

" " " STE. THERESE J2102884 J2137619

" " " RAMOS ARIZPE JS500209 JS518387

PONTIAC 88C08 1988 -- J9201282 J9232022

" " " -- JT202479 JT218385

OLDSMOBILE 88C04 1988 -- J9302156 J9358151

" " " -- JG300013 JG307649

" " " -- J2300045 J2325443

BUICK 88C11 1988 -- J6406615 J6424556

" " " -- JT402154 JT426763

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 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 TO THE FOLLOW-UP NECESSARY TO COMPLETE THIS CAMPAIGN. ANY DEALER NOT RECEIVING A COMPUTER LISTING WITH THE CAMPAIGN BULLETIN HAS NO INVOLVED VEHICLES CURRENTLY ASSIGNED.

OWNER NOTIFICATION

OWNERS WILL BE NOTIFIED OF THIS CAMPAIGN ON THEIR VEHICLES BY CHEVROLET MOTOR DIVISION (SEE COPY OF OWNER LETTER INCLUDED WITH THIS BULLETIN).

DEALER CAMPAIGN RESPONSIBILITY

DEALERS ARE TO SERVICE ALL VEHICLES SUBJECT TO THIS CAMPAIGN AT NO CHARGE TO OWNERS, REGARDLESS OF MILEAGE, AGE OF VEHICLE, 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.

OWNERS OF VEHICLES RECENTLY SOLD FROM YOUR NEW VEHICLE INVENTORY ARE TO BE CONTACTED BY THE DEALER, AND ARRANGEMENTS MADE TO MAKE THE REQUIRED CORRECTION ACCORDING TO INSTRUCTIONS CONTAINED IN THIS BULLETIN.

PARTS INFORMATION

PARTS REQUIRED TO COMPLETE THIS CAMPAIGN 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).

PART NUMBER DESCRIPTION QUANTITY/VEHICLE

10039419 PULLEY - WATER PUMP............. 1 (AS REQUIRED)

NOTICE: OF THE APPROXIMATELY 47,900 CHEVROLET UNITS INVOLVED IN THIS CAMPAIGN, IT IS ESTIMATED THAT 19,160 (40%) WILL REQUIRE INSPECTION ONLY AND 28,740 (60%) WILL REQUIRE A NEW WATER PUMP PULLEY. ORDER PARTS ACCORDINGLY BASED ON ATTACHED INVOLVED VEHICLE LISTING.

SERVICE PROCEDURE

1. OPEN AND PROP HOOD.

INSPECTION:

2. WATER PUMP PULLEYS ARE STAMPED (ON FRONT FACE) WITH A 4-CHARACTER PRODUCTION MANUFACTURING DATE CODE WHICH IS VISIBLE ON PULLEY AS INSTALLED ON VEHICLE (SEE ILLUSTRATION). FIRST TWO (2) CHARACTERS ARE THE DATE CODE. LAST TWO (2) CHARACTERS CAN BE DISREGARDED. CHECK DATE CODE TO DETERMINE IF REPLACEMENT IS REQUIRED.

CHARACTER POSITION: 1 2 3 4

SAMPLE DATE CODE : F 7 - -

CHARACTER POSITION #1 = MONTH OF PRODUCTION

A = JANUARY E = MAY J = SEPTEMBER B = FEBRUARY F = JUNE K = OCTOBER C = MARCH G = JULY L = NOVEMBER D = APRIL H = AUGUST M = DECEMBER

NOTE: LETTER I IS NOT USED.

CHARACTER POSITION #2 = YEAR OF PULLEY PRODUCTION

7 = 1987 8 = 1988

CHARACTER POSITIONS #3 + #4 - DISREGARD

THEREFORE, SAMPLE DATE CODE "F 7 - -" EQUALS JUNE OF 1987

IF INSPECTION INDICATES DATE CODE STAMP F7, G7, H7, J7, K7 OR L7, (I.E., PULLEYS BUILT BETWEEN JUNE AND NOVEMBER OF 1987) REPLACEMENT IS REQUIRED. FOLLOW INSTRUCTIONS UNDER PULLEY REPLACEMENT DESCRIBED BELOW.

IF DATE CODE STAMP IS ANYTHING OTHER THAN F7, G7, H7, J7, K7 OR L7, REPLACEMENT IS NOT REQUIRED. INSTALL CAMPAIGN IDENTIFICATION LABEL AND CLOSE HOOD.

PULLEY REPLACEMENT:

3. INSTALL FENDER COVERS AND DISCONNECT NEGATIVE BATTERY CABLE.

4. REMOVE SERPENTINE BELT. TO REMOVE BELT, ROTATE TENSIONER AS SHOWN IN ILLUSTRATION.

5. REMOVE HEATER HOSE PIPE CLIPS TO ALLOW SUFFICIENT ROOM TO REMOVE WATER PUMP PULLEY.

6. REMOVE WATER PUMP PULLEY USING PULLEY REMOVER J25034-B OR J29785-A.

7. INSTALL NEW WATER PUMP PULLEY USING PULLEY INSTALLER J25033-B OR BT-7515.

8. REINSTALL HEATER HOSE CLIPS.

9. REINSTALL SERPENTINE BELT. TO REINSTALL BELT, ROTATE TENSIONER AS SHOWN IN ILLUSTRATION. BELT ROUTING IS ALSO SHOWN IN ILLUSTRATION.

10. INSTALL CAMPAIGN IDENTIFICATION LABEL.

11. CONNECT NEGATIVE BATTERY CABLE, REMOVE FENDER COVERS AND CLOSE HOOD.

CAMPAIGN IDENTIFICATION LABEL

EACH VEHICLE CORRECTED IN ACCORDANCE WITH THE INSTRUCTIONS OUTLINED IN THIS BULLETIN WILL REQUIRE A "CAMPAIGN IDENTIFICATION LABEL." EACH LABEL PROVIDES A SPACE TO INCLUDE THE FIVE (5) DIGIT DEALER CODE OF THE DEALER PERFORMING THE CAMPAIGN SERVICE. THIS INFORMATION MAY BE INSERTED WITH A TYPEWRITER OR A BALL POINT 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. CLAIM INFORMATION

SUBMIT A PRODUCT CAMPAIGN CLAIM WITH THE INFORMATION INDICATED BELOW:

____________________________________________________________________ * FAILED PARTS LABOR LAB OTH REPAIR PERFORMED PC PART NO. ALLOW FC OP HRS HRS _____________________ ___ __________ _____ ____ _______ _____ _____ INSPECT WATER PUMP PULLEY DATE CODE - NO 00 V4700 0.2 0.1 FURTHER ACTION REQ'D. _____________________ ___ __________ _____ ____ _______ _____ _____ INSPECT AND REPLACE WATER PUMP PULLEY 1 10039419 ** 00 V4701 0.5 0.1

_____________________ ___ __________ _____ ____ _______ _____ _____

* CAMPAIGN ADMINISTRATIVE ALLOWANCE

** THE "PARTS ALLOWANCE" SHOULD BE THE SUM TOTAL OF THE CURRENT GMSPO DEALER NET PRICE PLUS 30% OF ALL PARTS REQUIRED FOR THE REPAIR.

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

REFER TO THE CHEVROLET CLAIMS PROCESSING MANUAL FOR DETAILS ON PRODUCT CAMPAIGN CLAIM SUBMISSION.

COPYRIGHT 1988 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION .

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.