MOANING NOISE AFTER START REPLACE OIL PAN AND OIL PUMP

VEHICLES AFFECTED: 1985-1988 C,E,K,V WITH 4.1L OR 4.5L TRANSVERSE V8 ENGINES

Some 1985-1988 DeVilles and Fleetwoods, 1986-1988 Eldorados and Sevilles, and 1987-1988 Allantes may experience a low moaning noise after cold engine start not unlike the noise associated with a dry power steering pump. The noise is caused by vibration of the oil pump pickup and can be repaired by replacing the oil pump assembly (pickup replacement is not possible since it is staked into the pump during manufacturing). New pumps with a revised configuration of the pickup are available by ordering:

- P/N 3517753 for 1985-1989 C, E, K - P/N 3517754 for 1987-1989 V

These new pumps will supersede the previously released parts.

Service for 1985-1987 C, E, K Vehicles

The revised pump can be used to directly replace the previous design. No modifications are required.

Service for 1988 C, E, K, and 1987-1988 V Vehicles

Since 1988 engine oil pans incorporate a baffle specifically haped to accommodate the oil pump pickup, the revised pickup configuration will not be compatible. On these vehicles, the oil pan must also be replaced.

- P/N 1649382 for C, E, K - P/N 1649126 for V

1989 production cars use these quieter oil pumps and the appropriately baffled oil pans.

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.