Engine noise (2.5si e85 N52)

se4y · 01-21-2014, 12:59 PM

I need you guys help:

not warter pump
not vacuum pump
not dynamo and bell wheel
not from the engine hood
It seems come out of oil filter by echometer but How is that possible?
everything is fine but the flickering noise!

Thanks a lot!!

(I found someone who had the almost the same problem from youtube

)

wonton180 · 01-22-2014, 08:59 AM

does the sound vary with engine RPM?

I'm guessing idler pulleys.

se4y · 01-22-2014, 09:40 AM

Quote:

Originally Posted by wonton180

does the sound vary with engine RPM?

I'm guessing idler pulleys.

The dealer said the two video are diferent. The second one sounds like from machinery Because it is regular with engine RPM.But mine like from some vale. I came back home to wait untill the sound get more clear.

Aries326 · 01-25-2014, 05:03 AM

That's the notorious N52 lifter tick problem. I had the same thing. The dealer swapped out the lifters and the ticking went away.

I read that the ticking will probably come back if the heads aren't replaced as well. Problem with that is BMW won't replace the heads unless ticking returns after lifter replacement. I've only driven about 2500 miles since lifters were replaced and I haven't had any ticking since.

There's a huge thread on it covering years of information. Some owners have been able to get dealers to replace lifters and heads. Others just lifters. Others none at all. Here's the thread:

http://www.e90post.com/forums/showthread.php?t=13504

01-21-2014, 12:59 PM	#1
se4y Private 14 Rep 53 Posts Drives: z4 e85 Join Date: Nov 2013 Location: beijing iTrader: (0)	Engine noise (2.5si e85 N52) I need you guys help: not warter pump not vacuum pump not dynamo and bell wheel not from the engine hood It seems come out of oil filter by echometer but How is that possible? everything is fine but the flickering noise! Thanks a lot!! (I found someone who had the almost the same problem from youtube )
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01-22-2014, 08:59 AM	#2
wonton180 Private First Class 3 Rep 106 Posts Drives: 07 Z4MC Join Date: Mar 2011 Location: Philadelphia iTrader: (0)	does the sound vary with engine RPM? I'm guessing idler pulleys.
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01-25-2014, 05:03 AM	#4
Aries326 Lieutenant Colonel 195 Rep 1,530 Posts Drives: 2008 Z4 3.0si, 2013 E92 M3 ZCP Join Date: Aug 2011 Location: NC iTrader: (2) Garage List 2013 E92 M3 [0.00] 2008 BMW Z4 3.0si [9.00]	That's the notorious N52 lifter tick problem. I had the same thing. The dealer swapped out the lifters and the ticking went away. I read that the ticking will probably come back if the heads aren't replaced as well. Problem with that is BMW won't replace the heads unless ticking returns after lifter replacement. I've only driven about 2500 miles since lifters were replaced and I haven't had any ticking since. There's a huge thread on it covering years of information. Some owners have been able to get dealers to replace lifters and heads. Others just lifters. Others none at all. Here's the thread: http://www.e90post.com/forums/showthread.php?t=13504 __________________
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