CAMPAIGN: ISUZU COOLING FAN ADAPTER PLATE REPLACEMENT

SUBJECT: ISUZU COOLING FAN ADAPTOR PLATE REPLACEMENT

MODELS: 1989-90 W4S042 GMC FORWARD - CHEVROLET TILTMASTER TRUCKS WITH AUTOMATIC TRANSMISSION

The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle which is subject to a recall campaign of this type must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to adequately repair within 60 days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time.

If the condition is not adequately repaired within a reasonable time, the owner may be entitled to an identical or reasonably equivalent vehicle at no charge, or to a refund of the purchase price less a reasonable allowance for depreciation.

To avoid having to provide these burdensome solutions, every effort must be made to promptly schedule appointments with owners and to repair their vehicles as soon as possible. As you will see in reading the attached copy of the letter which is being sent to owners, the owner is being instructed to contact the nearest GMC Zone Office if the dealer does not remedy the condition within five days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed how to contact the National Highway Traffic Safety Administration.

DEFECT INVOLVED

General Motors has learned of a safety defect which exists in some 1989-90 W4, W4 Flatlow, and W4 stripped chassis vehicles. Damage to the radiator and fan guides may occur as a result of cracks developed in the cooling fan clutch adaptor plate which connects the cooling fan and the fan pulley. These cracks cause the cooling fan to loosen and in some instances separate from the fan pulley mounting area while the engine is running.

If this separation occurs there may be damage to the radiator and shroud assembly. In addition, if a person is working on the vehicle in the vicinity of the engine fan blade when this occurs, personal injury can be caused by the fan blade segment.

To correct this condition, the adaptor plate (drawn type) must be removed and replaced with a circular adaptor plate.

VEHICLES INVOLVED

Involved are certain 1989-90 W4, W4 Flatlow, and W4 stripped chassis stripped chassis vehicles built within the following VIN breakpoints:

Model Year From Through ---------- -------- -------- 1989 K7005716 K7007482 1990 L7000001 L7007477

The specific vehicles involved in this campaign have been identified by Vehicle Identification Number Computer Listings. These listings are furnished to all involved dealers with the campaign 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. Dealers are to inspect and correct all affected vehicles in new and used vehicle stock prior to their sale.

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 ensure 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 cor- rection according to instructions contained in this bulletin.

If no owner's name and address were available to GMC Truck Division at the time of campaign initiation, the dealer will determine the owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.

GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170

Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of owner letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing 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 this campaign.

SERVICE PROCEDURE

CAUTION:

KEEP HANDS AND CLOTHING CLEAR OF MOVING FAN BLADES. (FAN MAY TURN WHEN THE ENGINE IS OFF) BLADES ARE EXPOSED AND CAN CAUSE PERSONAL INJURY.

REMOVAL:

--------- 1. Tilt the cab. Make sure safety lock pin is inserted in cab support bracket.

2. Disconnect battery negative cable.

3. Check the wheels. NOTE: To complete the following operation, it is not necessary that the fan belt be loosened at the alternator.

4. Remove fan attaching bolts from the cross type bracket. (See Figure 1)

A. If some of the attaching bolts are difficult to reach, rotate the pulley by using one of the mounting bolts.

CAUTION:

BE CAREFUL WHEN ROTATING THE FAN.

5. Place the removed fan inside the fan shroud. Be careful not to damage radiator fins.

NOTE DO NOT ATTEMPT T0 REMOVE FAN COMPLETELY AWAY FROM THE ENGINE SHROUD AREA. THE FAN CAN BE REMOVED FROM THE ADAPTOR PLATE EVEN WHEN THE FAN ASSEMBLY IS INSIDE THE SHROUD AREA.

6. Remove the cooling fan adaptor plate from the fan pulley.

7. Remove adaptor plate and be careful not to dislodge the fan pulley.

INSTALL NEW ADAPTOR PLATE: (See Figure 2) ---------------------------------------- 1. Install new bolts to fan pulley, part number 94001529. 2. Torque to 13.7 - 23.5 N-m (10 - 17 ft. lbs.). 3. Mount fan assembly to adaptor plate. 4. Install new bolts (part number 94001529) to fan bracket. 5. Torque to 13.7 - 23.5 N-m (10 - 17 ft.lbs.). 6. Install "Campaign Identification Label." 7. Remove safety pin in cab support bracket. 8. Close cab. 9. Connect negative battery cable. 10. Remove wheel chocks.

PARTS INFORMATION

Parts may be obtained from General Motors Service Parts Operation (GMSPO). They should be ordered from GMSPO on an order type ISC. Parts may also be obtained directly from Isuzu Parts Distribution Network (AIPDN). Parts are available in a kit.

Part Number Description Quantity ------------ ------------------------- -------- 97032153 Adaptor Plate Service Kit 1

Service Kit 97032153 consists of the following listed items:

Part Number Description Quantity ----------- -------------- --------- 94031597 Adaptor Plate 1 94001529 Plate Bolt 4 94001509 Fan Bolt 4

WARRANTY INFORMATION

Dealers should submit an accurately filled out Warranty Repair Order on each vehicle completed under this campaign.

Labor *Time Trouble Operation Description Allowance Code Number --------- ---------------- --------- ---- V6211 Inspect, circular .2 Hr 96 (pressed) plate already installed - No further action required.

V6210 Remove drawn .4 Hr 96 type adaptor plate and install circular (pressed) plate.

* For dealer to receive Administrative Time Allowance associated with this campaign, add 0.1 hour to the Labor Operation Time Allowance.

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 five (5) digit dealer code of the dealer performing the campaign service. This infor- mation may be inserted with a typewriter or ball point pen.

Each "Campaign Identification Label" is to be located on the cab inner panel (see sketch for location) in an area which will be visible when the vehi- cle is brought in for periodic servicing by the owner.

Apply "Campaign Identification Label' only on a clean, dry surface.

ADMINISTRATIVE PROCEDURE

Procedures covering this campaign are outlined in Section V of your dealership's "GM Truck Claims Processing Manual" #P 8919.

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.