Engine Controls - Turbocharger Clanking Noises

SI B11 13 07
Engine

June 2012
Technical Service

[NEW] This Service Information bulletin supersedes SI B11 13 07 dated August 2010.

[NEW] designates changes to this revision

SUBJECT
N54 Engine: Distinct Clanking Noise from Turbocharger Area

MODEL
E90, E92 and E93 (3 Series) 335i and 335xi
E60 and E61 (5 Series) 535i and 535xi

All with N54 engine from the start of production up to March 2008 production

SITUATION
The customer complains of a metallic noise from the exhaust system near the engine or turbocharger area. This noise is described as a clanking noise, occurring up to six or seven times in a row during a deceleration from approximately 3,500 RPM; or during a heavy application of the accelerator without a drive gear being engaged.

Complaints received regarding a slight rattle from this area under steady acceleration in the 2,000 RPM to 4,000 RPM range are due to the rotating waste gate valve face; this is a characteristic of the mechanical waste gate. The rotating waste gate valve face is necessary to ensure proper sealing. This slight rattle noise is considered normal operation of the mechanical waste gate valve. No repair should be attempted for this type of rattling complaint.

CAUSE
The wastegate valve does not completely close due to the mechanical tolerances of the wastegate actuator. This results in the wastegate valve repeatedly clanking against its seating surface.











PROCEDURE





PARTS INFORMATION












[NEW] WARRANTY INFORMATION