CAMPAIGN: HARMONIC DAMPER CTR. BOLT UNDER TORQUED
SUBJECT: Harmonic Damper Centre Bolt Under Torqued -----------------------------------------
MODEL/YEAR: 1996 Chevrolet and GMC S/T Utility Vehicles Built ---------------------------------------------------- at Moraine Assembly -------------------
TO: ALL GENERAL MOTORS DEALERS
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CERTAIN 1996 Chevrolet and GMC S/T Utility vehicles built during a four-day period at the Moraine Assembly plant may have a harmonic damper centre-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 Chevrolet and GMC S/T Utility vehicles built within the following VIN breakpoints:
Year Model Plant Plant Code From Through ---- ----- ---- ---------- ---- ------- 1996 Chev Blazer Moraine 2 T2158127 T2161488 1996 GMC Jimmy Moraine 2 T2520775 T2521781
NOTE: PLEASE CHECK DCS SCREEN 445 OR YOUR V.I.N. LISTING BEFORE PERFORMING CAMPAIGN TO ENSURE THAT THE VEHICLE IS AFFECTED. ONLY AFFECTED VIN'S WILL BE PAID.
All affected vehicles have been identified by the VIN listing provided to involved dealers with this bulletin. Any dealer not receiving a listing was not shipped any of the affected vehicles.
DEALER CAMPAIGN RESPONSIBILITY:
All unsold new vehicles in dealer's 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 perform this campaign on all involved vehicles at no charge to owners, regardless of kilometres traveled, 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 instructions contained in this bulletin. This could be done by mailing to such owners a copy of the owner 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 is taken into your new or used 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.
CAMPAIGN PROCEDURE:
Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.
OWNER NOTIFICATION:
All owners of record at the time of campaign release are shown on the attached computer listing and have been notified by first class mail from General Motors (see copy of owner letter included with this bulletin). The listings provided are for campaign activity only and should not be used for any other purpose.
PARTS INFORMATION:
No parts required to complete this campaign.
PARTS AND LABOUR CLAIM INFORMATION:
Credit for the campaign work performed will be paid upon receipt of a properly completed campaign claim card or DCS transmission in accordance with the following:
Repair Code Description Time Allowance ----------- ----------- -------------- 2WD 2A Crankshaft Pulley Bolt Re-Torque 0.3
4WD 3A Crankshaft Pulley Bolt Re-Torque 0.4
Time allowance includes 0.1 hour for dealer administrative detail associated with this campaign.
SERVICE PROCEDURE:
1. Prep vehicle.
2. Raise vehicle.
3. If T-Utility, remove splash shield (6 - 15mm bolts). (Not necessary for S-Utility).
4. While holding one of the three pulley bolts (to prevent crankshaft movement), torque the crankshaft pulley centre bolt (Figure 1) to 90 N.m.
5. If T-Utility, install splash shield (6 - 15mm bolts). (Not necessary for S-Utility).
6. Lower vehicle.
7. Install Campaign Identification Label.
INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL
Clean surface of radiator upper mounting panel and apply a Campaign Identification Label. Make sure the correct campaign number is inserted on the label. This will indicate that the campaign has been completed.
Dear General Motors Customer:
CERTAIN 1996 Chevrolet Blazer and GMC Jimmy Sport Utility trucks built during a four-day period at the Moraine Assembly plant may have a harmonic damper centre-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 be absolutely sure that your vehicle is to specifications, your GM dealer will bring the harmonic damper bolt up to the specified torque.
This service will be provided for you at no charge.
Please contact your GM dealer as soon as possible to arrange a service date.
This letter, identifies your vehicle. Presentation of this letter to your dealer will assist their Service personnel in completing the necessary correction to your vehicle in the shortest possible time.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
Customer Support Department General Motors of Canada Limited
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.
