EXHAUST LEAK NOISE/SQUEAK AT EXHAUST PIPE -REPL. ASSEMBLY

SUBJECT: EXHAUST LEAK NOISE OR SQUEAK AT EXHAUST PIPE TO MANIFOLD SEAL (REPLACE NUT/SPRING ASSEMBLY, STUDS, AND SEAL)

MODELS AFFECTED: 1992 GRAND AM MODELS W/2.3L (RPOs LG0, LD2, L40) ENGINE VIN (MODELS): A, D, 3

THIS BULLETIN IS BEING REVISED TO UPDATE THE EXHAUST SEAL PART NUMBER, AND ADD INFORMATION TO THE "CORRECTION" AND "WARRANTY INFORMATION" SECTIONS. THIS BULLETIN CANCELS AND REPLACES BULLETIN 92-6-20 ISSUED 2/92.

CONDITION:

---------- Exhaust leak noise at exhaust manifold to exhaust manifold pipe seal during heavy load (i.e., wide open throttle) while in "drive." - OR - Exhaust squeak at the exhaust manifold to exhaust manifold pipe seal when shifting into "drive" or "reverse" (when the engine moves on its mounts).

CAUSE:

------ Low clamp load on exhaust seal causes leaks.

High clamp load on exhaust seal causes squeaks.

CORRECTION:

----------- For vehicles built BEFORE the breakpoints below:

Replace the exhaust seal, studs, nut/spring assembly if the exhaust seal leaks during wide open throttle (in "drive") or squeaks.

For vehicles built AFTER the breakpoints below:

Replace the exhaust seal if the exhaust seal leaks or squeaks.

SERVICE INFORMATION:

Refer to Section 6F in appropriate service manual for replacement procedure of the exhaust seal, studs, nut/spring assembly. Following are the vehicle VIN breakpoints for the cars which may exhibit the exhaust leak or squeak.

YEAR PLANT FROM TO ---- ------ ---- -- 1992 Lansing North Start of Production NMO31509 1992 Lansing South Start of Production NC216965

PARTS INFORMATION:

Quantity Required Part Numbers Part Description per Car ------------ ---------------- ----------------- 24570569 Nut/Spring Assembly 2 24573215 Stud 2 22545205 Seal 1

WARRANTY INFORMATION:

For vehicles built before the VIN breakpoint (replace seal, studs, nut/spring assembly):

Labor Time Operation Number: T-1792 Labor Time Allowance: .4 hour Trouble Code: 92

For vehicles built after the VIN breakpoint (replace seal only)

Labor Time Operation Number: L-2090 Labor Time Allowance: .3 hour

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.