EXHAUST LEAK/NOISE REPLACE NUT/SPRING ASSY.

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

MODELS AFFECTED: 1992 SKYLARK WITH 2.3L QUAD OHC ENGINE (VIN CODE 3)

THIS BULLETIN IS BEING REVISED TO UPDATE THE EXHAUST SEAL PART NUMBER, AND ADD INFORMATION TO THE "CORRECTION" AND "WARRANTY INFORMATION" SECTIONS. PLEASE DISCARD BULLETIN 92-6-4.

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 breakpoint 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 breakpoint 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.

VIN BREAKPOINT: Lansing South Start of Production NC620454

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: T1792 Labor Time Allowance: .4 hour Trouble Code: 92

For vehicles built after the VIN breakpoint (replace seal only) Labor Time Operation Number: L2090 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.