SW L4-1.9L DOHC VIN 7 (1993)
Oil Pressure Regulator Valve: All Technical Service Bulletins
Engine - Intermittent Squeal/Whistle From Engine
NO.: 92-T-45B
DATE: November, 1993
GROUP: Engine
CORP NO.: 286103R
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Due to revisions in the affected model years and the deletion of VIN breakpoints, this bulletin superceded bulletin 92T45A, which should be discarded.
MODELS AFFECTED:
All 1991-1994 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.
CORRECTIVE ACTION:
Attempt to verify the complaint 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
