OIL LEAK AT FILTER ADAPTER NEW OIL FILTER GASKET P/N

MODELS: 1989-91 T TRUCK

CONDITION:

Some 1989-90 and early 1991 T trucks may exhibit an oil leak at the left rear of the engine coming from the oil filter adapter bolts.

CAUSE:

This condition may be due to the inability of the gasket between the oil filter adapter and engine block to seal properly. This loss of sealing may also result in the adapter bolts losing torque.

CORRECTION:

This condition may be repaired by installing a new oil filter adapter (P/N 10172750) and gasket (P/N 10172754), per the following instructions.

Important

IMPORTANT Retorquing the bolts with the existing gasket will only result in a temporary fix for the customer.

Parts are currently available through GMSPO.

PROCEDURE:

1. Disconnect negative battery cable and raise vehicle on hoist.

2. Remove transfer case skid plate and front axle skid plate from vehicle.

3. Using a long extension through the opening created by removing the front axle skid plate, remove the remote oil filter adapter line bolt.

4. Disconnect the adapter from the engine block by removing both adapter bolts.

5. Clean entire engine block contact area to ensure all old gasket material is removed.

6. With the new gasket in place loosely attach the new adapter assembly to the block. It may be helpful to apply a light amount of petroleum jelly to the gasket to hold it in place during reinstallation.

NOTICE: Do not use adhesive to attach the gasket to the adapter, as this can cause gasket damage.

7. Reattach the remote lines to the adapter. Make sure the remote line O-rings are in place. Torque the remote line bolt to 30-39 N.m (22-29 lbs. ft.). Reattach the adapter to the engine block and torque both adapter bolts to 18-24 N.m (13-18 lbs. ft.).

NOTICE: Do not overtorque adapter bolts, as this can rause gasket damage.

8. Reinstall skid plates on front axle and transfer case.

9. Check engine oil level and add as required.

10. Reconnect battery.

WARRANTY INFORMATION

For vehicles repaired under warranty use:

Labor Operation: J0965

Labor Time: .5 Hours

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.