HAMMER/RATTLE NOISE PASS. COMP (RPL. FUEL LINE RETAIN CLIPS)

SUBJECT: HAMMER/RATTLE NOISE IN PASSENGER COMPARTMENT (REPLACE FUEL LINE RETAINING CLIPS, STUD AND NUT)

VEHICLES AFFECTED: 1992 -Y- MODEL WITH 5.7L ENGINE (VIN P, RPO LT1)

CONDITION:

--------- Some 1992 Y-cars with 5.7L V-8 engines (RPO LT1) and assembled prior to VIN N5115323, may exhibit a light hammering/rattle type noise audible in the vehicle passenger compartment.

CAUSE:

----- Pressure pulsation's in the fuel system generated by fuel injector operation causing hydraulic hammering in chassis fuel pipes.

CORRECTION:

---------- Replace existing retaining clips, stud and nut securing fuel feed and return pipes to the air conditioning evaporator and blower motor module assembly with new parts indicated below and installed as shown in attached illustration.

Torque Specifications:

Stud to module: 2.5 N.m + or - 0.5 Nut to stud: 4.5 N.m + or - 1.0

PARTS INFORMATION:

Part Description Part Number Quantity --------------- ----------- -------- Fuel Line Insulator Stud Asm. 10218527 1 Nut 11503747 1 Clip 25526629 2

WARRANTY INFORMATION:

For vehicles repaired under warranty use:

Labour Time: 0.2 HRS

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.