TSB's

Musical Seals

Owners of 2009 BMW 128i vehicles may complain of a whistling, hooting or squealing noise from the engine compartment while the engine is running. The noise may be more apparent after the engine has reached operating temperature.

The noise is due to a manufacturing error in the front or rear crankshaft oil seal.

PROCEDURE A: Rear crankshaft seal noise verification and repair

1. Start the engine and allow it to idle to reproduce the noise. The noise will be more apparent under the vehicle, near the transmission bell housing.

2. After the noise is reproduced, partially loosen the engine oil fill cap, which will reduce crankcase pressure.

3. If the noise diminishes when the oil fill cap is loosened, the noise is related to the rear crankshaft oil seal. Replace the seal according to Repair Instruction 11 14 151.

PROCEDURE B: Front crankshaft seal noise verification and repair

1. While driving the car, a noise can be reproduced when actuating the brake pedal. Once the noise is created, it will not diminish.

2. After the noise is reproduced, partially loosen the engine oil fill cap.

3. If the noise diminishes when the oil fill cap is loosened, the noise is related to the front crankshaft seal. Replace the seal according to Repair Instruction 11 14 005.

Tags: BMW 
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