nick1970

Related BMW Topics:
Bmw, E85, E90, E60, Oil, May, Rpm, Top, Two, Cold
Question
my Bmw 545 v8 engine just started tapping and a slight knock on the passenger side of the engine what could the cause be? It is full with oil and has no water in the oil.

It was running just fine yesterday. I did put sea-foam in the crankcase last week.

Accepted Answer
It sounds like one of the hydraulic valve lifters have collapsed. Below is the bulltin from BMW with the bleed procdure.




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SI B 11 09 07
Engine January 2009
Technical Service

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This Service Information bulletin supersedes SI 11 09 07 dated April 2008.




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designates changes to this revision



SUBJECT
Intermittent Hydraulic Valve Adjuster (HVA): "Ticking" or "Rattling" Noises




MODEL

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All E82, E83, E85, E86, E88, E60, E61, E70, E90, E91, E92, and E93 with the N51, N52 or N52K engines





SITUATION
An occasional ticking or rattling noise from the HVA elements may occur during cold engine starts or frequent short-distance driving.



CAUSE
In these situations, the HVA elements may not yet have been supplied with sufficient amounts of air-free oil. This condition will not cause any damage to the engine, and usually remedies itself with a longer driving distance or operating times at full operating temperature.



CORRECTION
In the event of a customer complaint, please perform the following the HVA bleeding procedure.



PROCEDURE
Important notes:



The bleed time may take anywhere from between two minutes and (in rare cases) to a maximum of 30 minutes. This procedure is to be performed on a level surface with the vehicle stationary, and in a properly ventilated area.



Procedure preconditions:



Engine oil level correct - neither underfilled nor overfilled



Engine running at operating temperature




Bring the engine up to an operating speed (no load) of 2000-3000 rpm and maintain this condition for three minutes (bleeding procedure).


Let the engine idle for 15-30 seconds and reevaluate whether the noise is still present or not.




Engine quiet - procedure is finished.


Engine noise is still present - repeat the procedure; perform steps #1 and #2 up to a maximum of 5 times.


Only if the noise remains after performing the bleeding procedure 5 times: proceed by performing the procedure for a final time, also at an engine operating speed of 2000-3000 rpm, but for a total time duration of 15 minutes.

BMW Technician

BMW Master Certifed level 1 Technican

twh

That SIB is only for the 6 cylinder N52 engine. It doesn't apply to an V8 engines. Now, of course, you could have a defective hydraulic lifter causing this noise.

Thanks, Tom

nick1970

I know it doesn't apply to the v8.It's only for info purposes