Engine - Whistling, Hooting, Or Squealing Noise

SI B11 03 11
Engine

August 2012
Technical Service

This Service Information bulletin supersedes SI B11 03 11 dated September 2011.

[NEW] designates changes to this revision

SUBJECT
N55 Engine: Whistling, Hooting or Squealing Noise While Engine Is Running

MODEL
[NEW] E82 and E88 produced from 7/1/2009 to 8/31/2011

[NEW] E90, E92 and E93 produced from 7/1/2009 to 8/31/2011

[NEW] E70 produced from 7/1/2009 to 8/31/2011

[NEW] E71 produced from 7/1/2009 to 8/31/2011

[NEW] F10 from start of production to 8/31/2011

[NEW] F07 from start of production to 8/31/2011

NEW] F25 from start of production to 8/31/2011

[NEW] F12 and F13 from start of production to 8/31/2011

SITUATION
The customer states that a noise described as whistling, hooting or squealing can be heard from the engine compartment while the engine is running. The noise may be more apparent after the engine has reached operating temperature.

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

[NEW] PROCEDURE

Procedure A: Rear crankshaft seal noise verification and repair solution.

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

2. After the noise is reproduced, partially loosen the engine oil fill cap, resulting in a reduction of the 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 rear crankshaft oil seal according to Repair Instruction REP 11 14 151.

Procedure B: Front crankshaft seal noise verification and repair solution.

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; this will reduce the crankcase pressure.

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





[NEW] PARTS INFORMATION








[NEW] WARRANTY INFORMATION