CAMPAIGN: HARMONIC DAMPER CTR. BOLT UNDER TORQUED
Subject: PRODUCT CAMPAIGN 96-C-23 - HARMONIC DAMPER CENTER BOLT ------------------------------------------------------ UNDER TORQUED -------------
MODEL/YEAR: 1996 S/T UTILITY VEHICLES BUILT AT MORAINE ASSEMBLY ---------------------------------------------------
To: All Chevrolet/Geo Dealers
Some 1996 S/T Utility vehicles built during a four-day period at the Moraine Assembly plant may have a harmonic damper center attaching bolt that was under torqued. This bolt secures the harmonic damper onto the crankshaft and the accessory drive pulley, which is attached to the damper, to the engine crankshaft. If this bolt were to completely loosen, the harmonic damper press fit would begin to loosen. This loosening would likely manifest itself as accessory drive belt noise, soon followed by the drive belt coming off the pulley or breaking, which would cause a loss of drive to the engine accessories. Additionally, the loosening of the damper-pulley assembly would likely damage the crankshaft.
To correct this condition, dealers will bring the harmonic damper bolt up to the specified torque.
VEHICLES INVOLVED
Involved are CERTAIN 1996 S/T Utility vehicles built within the following VIN breakpoints:
PLANT YEAR MODEL PLANT CODE FROM THROUGH ---- ----- ----- ----- ---- ------- 1996 Blazer Moraine "2" T2158127 T2161488
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
All unsold new vehicles in dealers, possession and subject to this campaign must be held and inspected/repaired per the service procedure of this campaign bulletin before owners take possession of these vehicles.
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.
Owners of vehicles recently sold from your new vehicle inventory with no owner information indicated on the dealer listing, are to be contacted by the dealer, and arrangements made to make the required correction according to the instructions contained in this bulletin. This could be done by mailing to such owners a copy of the owners letter accompanying this bulletin. Campaign follow-up cards should not be used for this purpose, since the owner may not as yet have received the notification letter.
In summary, whenever a vehicle subject to this campaign enters your vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.
PARTS INFORMATION
No parts are required for this campaign.
SERVICE PROCEDURE
1. Raise vehicle.
2. If T-Utility, remove splash shield (6 - 15 mm bolts) (Not necessary for S-Utility)
3. While holding one of the three pulley bolts (to prevent crankshaft movement), torque the crankshaft pulley center bolt (Figure 1) to 90 Nm (66 lb. ft.).
4. If T-Utility, install splash shield (6-15 mm bolts) (Not necessary for S-Utility).
5. Lower vehicle.
6. Install Campaign Identification Label.
CAMPAIGN IDENTIFICATION LABEL
Each vehicle corrected 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 campaign number and 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. When installing the new Campaign Identification Label, be sure to install the clear protective covering. Additional Campaign Identification Labels can be obtained from VISPAC Incorporated by calling 1-800-269-5100 (Monday-Friday, 8:00 a.m. to 4:30 p.m. EST). Ask for Item Number S-1015 when ordering.
Apply "Campaign Identification Label", only on a clean, dry surface.
CLAIM INFORMATION
Submit a Product Campaign Claim with the information indicated below:
PART FAILED PARTS LABOR LABOR REPAIR PERFORMED COUNT PART NO. ALLOW CC-FC OP HOURS ---------------- ----- -------- ------ ----- ----- ------ Blazer 2WD- Crankshaft Pulley - -- -- MA-96 V9913 0.2 Bolt Re-Torque
B1azer 4WD- Crankshaft Pulley - -- -- MA-96 V9914 0.3 Re-Torque
* For Campaign Administrative Allowance, add 0.1 hours to the "Labor Hours".
Refer to the General Motors Corporation Claims Processing Manual for details on Product Campaign Claim Submission.
March 1996
Dear Chevrolet Customer:
As a valued customer, your complete satisfaction with your Chevrolet truck is our goal. In keeping with this goal, we want to let you know that we have discovered a problem that could affect your vehicle and we want to take care of it at no charge to you.
REASON FOR THIS RECALL
Some 1996 Blazers built during a four-day period at the Moraine Assembly plant may have a harmonic damper center-attaching bolt that was under torqued. This bolt secures the harmonic damper onto the crankshaft and the accessory drive pulley, which is attached to the damper, to the engine crankshaft. If this bolt were to completely loosen, the harmonic damper press fit would begin to loosen. This loosening would likely manifest itself as accessory drive belt noise, soon followed by the drive belt coming off the pulley or breaking, which would cause a loss of drive to the engine accessories. Additionally, the loosening of the damper-pulley assembly would likely damage the crankshaft.
WHAT WE WILL DO
To be absolutely sure that your vehicle is to specifications, your Chevrolet dealer will bring the harmonic damper bolt up to the specified torque. This service will be performed for you at no charge.
WHAT YOU SHOULD DO
Please contact your Chevrolet dealer as soon as possible to arrange a service date and so the dealer may order the necessary parts for the repair. Instructions for performing this service have been sent to your dealer and parts are available. Please contact your dealer to arrange a service date as soon as possible. You may ask your dealer if you wish to know how much time will be needed to schedule and process your vehicle.
The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary correction in the shortest possible time. If you have s-old or traded your vehicle, please let us know by completing the postage paid reply card and returning it to us.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
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.
