SPECIAL POLICY: MANIFOLD EXHAUST PIPE SEALS LEAKING

MODELS: 1985 S/T MODELS WITH 2.8L (RPO LR2) ENGINE AND CALIFORNIA EMISSIONS (YFS)

General Motors has determined that some 1985 S/T model trucks with the 2.8L (RPO LR2) engine and California emissions (YF5) may exhibit an exhaust leak. This condition may be caused by an inadequate seal(s) between the exhaust manifold and exhaust pipe.

New exhaust manifold to exhaust pipe seals and bolts have been released to correct this condition. The new bolts can only be used on the right side, while the new seal can be used on both sides.

VEHICLES INVOLVED

YEAR PLANT FROM THROUGH ---- ---- ---- ------- 1985 Shreveport SOP EOP

SPECIAL POLICY ADJUSTMENT

Should this condition occur, General Motors will repair involved vehicles at no charge as follows:

For vehicles under 5/50,000 miles, leaking seals will be replaced under normal warranty. A free inspection if owner suspects exhaust manifold or exhaust pipe seal leakage.

For vehicles over 50,000 miles, a Special Policy will provide a one time only free inspection and replacement of leaking exhaust manifold to exhaust pipe seals (regardless of time/mileage) for three (3) months (90 days) from date of the owner letter.

Additionally, owners within these criteria that have had these seals replaced previously at their expense will be reimbursed for three (3) months (90 days) from date of the owner letter.

This "SPECIAL POLICY ADJUSTMENT BULLETIN" should be filed in the three ring binder furnished each dealer by General Motors.

OWNER NOTIFICATION

Owners of vehicles involved in this SPECIAL POLICY ADJUSTMENT will be notified by GMC Truck Division (see copy of owner letter included with this bulletin).

SERVICE PROCEDURE (See Figure 1)

1. Raise and support vehicle.

2. Remove the two bolts the exhaust pipe at the transmission support.

3. Remove the exhaust pipe to exhaust manifold bolts, right side and left side attaching hardware will be reused.

4. Use a pry bar, separate the exhaust pipe assembly from the manifold. Remove the seals and discard.

5. Install new seals. Install new bolts on the right hand manifold and use the existing studs/nuts on the left hand side. Torque bolts to 20 Nm (15 ft.lbs.)

6. Reinstall bolts at the transmission support. Torque bolts to 35 Nm (25 ft.lbs.).

Parts Information

Parts are available from General Motors Service Parts Operations (GMSPO).

Part Number Description Quantity ------ ----------- --------

15547998 Seal, Exhaust Manifold 2 15547999 Bolt, Exhaust Manifold 2 (Right Side Only)

Warranty Information

Dealers should submit a warranty claim on each vehicle compelted.

Labor Operation Time Number Description Allowance ------ ----------- ---------

T8012 Inspection Only .2 Hr.

Replace two (2) exhaust pipe seals and bolts:

T8010 - S Truck .5 Hr. T8011 - T Truck .6 Hr.

REIMBURSEMENT

Claims for customer reimbursement for previously paid repairs to correct a exhaust manifold to exhaust pipe seal(s), are to be submitted to an authorized GMC Truck dealer within three (3) months (90 days) from the date of this letter. The reimbursement should not exceed the amount paid by GMC Truck Division for the applicable labor operation.

When a customer requests reimbursement, the following must accompany the request:

Proof of ownership, and

Original paid receipt, or

A copy of receipt with proof of payment.

Claims for customer reimbursement on previously paid repairs are to be submitted on a warranty claim.

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.