PWR.STG.MOAN/SHUDDER REPL. INLET HOSE & CONTROL VALVE

SUBJECT: POWER STEERING MOAN/SHUDDER (REPLACE INLET HOSE, FLOW CONTROL VALVE AND SHIELD ALTERATION)

MODELS AFFECTED: 1990-91 REGAL MODELS WITH 3800 V6 ENGINE (VIN CODE L)

This bulletin cancels Bulletin 91-3-3 dated December, 1990 entitled "Power Steering Moan". Information contained in this bulletin will address both power steering moan and shudder, provide new part numbers and revised service procedure for correction of condition based on vehicle model year. Please discard Bulletin 91-3-3.

CONDITION:

---------- Some 1990-91 Regals with 3.8L V6 engines (VIN Code L) and assembled prior to VIN M1858118 may exhibit a slight power steering moan/shudder condition noted during static or low speed turning maneuvers. This condition may be perceived as a disturbance felt and heard by the vehicle operator through the body structure and steering wheel.

CAUSE:

------- A combination of power steering pump pressure pulses and engine firing frequency generating a disturbance transmitted through the body structure.

CORRECTION:

----------- 1990 Vehicles Replace existing power steering inlet (pressure) hose and pipe assembly, pump flow control valve and alter heat shield following applicable Service Manual procedures, Bulletin 91-3-13 (Corp. #133205) and noted in Figures 1 and 2.

Parts Required:

P/N 26028655 Inlet Hose and Pipe Asm. P/N 7841852 Pump Flow Control Valve

1991 Vehicles

Replace existing power steering inlet (pressure) hose and pipe assembly and alter heat shield following applicable Service Manual procedures, Bulletin 91-3-13 and noted in Figures 1 and 2.

Parts Required

P/N 26028655 Inlet Hose and Pipe Asm.

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation Number: T1719 Labor Time: 1990 1.3 Hours 1991 1.0 Hours

Hose Installation sequence:

1. Install hose and hand tighten fitting at pump.

2. Position to achieve light touch condition between foam sleeve and oil filter adapter (see point "A" on figure).

3. Torque pump hose fitting to 27 N.m (20ft lbs) maintaining hose position noted in step 2.

4. Hand tighten fitting at power steering gear.

5. Install clamp on steering gear.

6. Torque steering gear hose fitting to 27 N.m (20ft lbs)

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.