SQUEAL/WHISTLE ON COLD START (DIAG./REPL OIL PRESSURE REG.). Saturn Saturn 1994

For 1990-2009 cars

# SQUEAL/WHISTLE ON COLD START (DIAG./REPL OIL PRESSURE REG.)

#### SUBJECT: Intermittent Squeal or Whistle From Engine Compartment During Initial Cold Start or Between 1500-2500 RPM at Normal Operating Temperature LKO/LLO Engines (Check Accessory Drive Belt and Oil Pressure Regulator)

Due to revisions in the affected model years and the deletion of VIN breakpoints, this bulletin supersedes bulletin 92-T-45A, which should be discarded.

#### MODELS AFFECTED: 1991 - 994 Saturns

CONDITION: An intermittent squeal or whistle may be heard from the engine compartment for a few seconds on initial cold start-up or between 1500-2500 RPM at normal operating temperature.

CAUSE: The noise is caused by the engine oil pump pressure regulator valve.

CORRECTION: Attempt to verify the concern by removing the accessory drive belt and performing a cold start. (Refer to the "Engine Drive Belt and Accessories" section of the "Engine-Mechanical Service Manual.")

#### NOTICE: To prevent engine overheat, do not allow engine to run for more than two minutes (cold engine at room temperature), with the accessory drive belt removed.

If the noise can be duplicated with the drive belt removed, replace the oil pressure regulator valve assembly according to the "Procedures" in this bulletin.

If the noise cannot be duplicated, check the accessory drive belt tension and the belt tensioner assembly as outlined in the "Engine Drive Belt and Accessories" section of the "Engine-Mechanical Service Manual." If both are found to be within specifications, replace the oil pressure regulator valve assembly according to the "Procedures" in this bulletin.

#### OIL PRESSURE REGULATOR VALVE ASSEMBLY REMOVAL AND INSTALLATION

#### Removal

1. Remove the front cover assembly. Refer to the "Engine Lubrication Section" in the "Engine-Mechanical Service Manual" for replacement procedures.

2. Remove the oil pump cover plate screws.

#### IMPORTANT: An impact driver and T - 30 TORX's are required to break the oil pump screws loose.

#### IMPORTANT: The oil pump cover screws are coated with a sealant to prevent oil leakage. New screws must be installed.

3. Remove the drive and driven rotors.

4. Using service removal tool SA9103E, pull the oil pressure regulator valve from its bore.

#### Installation

1. Coat the new oil pressure regulator valve (P/N 25014181) with engine oil and tap it into the cover bore until it seats using service installation tool SA9103E and a hammer.

#### NOTICE: The oil pump assembly must be packed with petroleum jelly to prime the pump.

2. Install the drive and driven rotors into the pump body with chamfer toward the front engine oil seal.

3. Install the oil pump body cover using new screws (P/N 21006630, nine screws required).

Torque: 11 N-m (97 lbs. in.)

#### IMPORTANT: The screw holes in the front cover must be clean and dry before installing the oil pump cover screws.

4. Install the front cover assembly. Refer to the "Engine Lubrication Section" in the "Engine-Mechanical Service Manual" for installation procedures.

TOOL REQUIREMENTS: SA9123E Gasket Seal Cutter SA9103E Regulator Valve Replacer/Installer SA9173G Slide Hammer SA9104E Front Crankshaft Seal Replacer

PARTS REQUIREMENTS: 25014181 Oil Pressure Regulator Valve 21006630 Oil Pump Cover Screws (9 Required)

#### NOTE: The part number for the oil pump cover screw, in the Parts Catalog is incorrect. Use the part number listed above.

CLAIM INFORMATION: To receive credit for this repair, submit a claim through the Saturn Dealer System as follows:

Labor Case Operation Type Description Code Time ------------------------------------------------------ VW Oil Pump Pressure Regulator J0980 3.7 hrs Valve - Replace With Power Steering - Add .3 hrs (Time includes performing an engine cold start with accessory drive belt removed and checking accessory drive belt tension and belt tensioner assembly, if required.)

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.