Engine - Whistling, Hooting, Or Squealing Noise
SI B11 03 11Engine
September 2011
Technical Service
This Service Information bulletin supersedes SI B11 03 11 dated May 2011.
[NEW] designates changes to this revision
SUBJECT
N55 Engine: Whistling, Hooting or Squealing Noise While Engine Is Running
MODEL
[NEW] E82 and E88 (1 Series) produced from 7/1/2009 to 8/31/2011
[NEW] E90, E91, E92 and E93 (3 Series) produced from 7/1/2009 to 8/31/2011
[NEW] E70 (X5) produced from 7/1/2009 to 8/31/2011
[NEW] E71 (X6) produced from 7/1/2009 to 8/31/2011
[NEW] F10 (5 Series) from start of production to 8/31/2011
[NEW] F07 (Gran Turismo) from start of production to 8/31/2011
[NEW] F25 (X3) from start of production to 8/31/2011
[NEW] F12 (6 Series) 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.
CAUSE
The noise is due to a manufacturing error in the rear crankshaft oil seal.
PROCEDURE
1. Start the engine and allow it to idle to reproduce the customer's 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 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.
PARTS INFORMATION
WARRANTY INFORMATION