Cold Startup Rattling Noise - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 01-17-2005, 02:42 PM
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I have a 1993 325i with the m50 engine, Everytime is cold out there and the car sits overnight, it does a rattling,tapping noise at startup then goes away in two seconds. it this the timing chain, ive replaced the tensioner already and did not help, this car had hydraulic lifter, could this be it. Ive read that if its the lifter is normal if the noise goes away in a couple of second. my case.
Anyway im running lubro moly 10w40 the weather does not goes below freezing., so i believe the oil is alright. and is also all full.
i've done a complete work on this engine, all fluids replaced, gaskets and all, the only thing i did not do was to open the engine, take the head out. other that that all gasteks new and all.
after start up the engine is quiet, smooth and drives beautifully.
My questions are, does anyone knows what can this be?
And, will a s50/s52 timing chain tensioner fit an m50?

By the way i dont want to take to the dealer, i dont like their service, and im anal about my car, i dont feel confortable when other people mess with it..

thank you. and please let me know, i even have a video of the car making the noise, if you want i can e mailed to you so you can have a better idea. Thanks!!
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#2 (permalink) Old 01-17-2005, 03:39 PM
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Mine does the same exact thing..It is lifter noise. When it's cold outside the oil is thick and it takes a couple seconds to get circulated again. From all the research I have done is that this is a common noise and unavoidable.

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#3 (permalink) Old 01-17-2005, 07:19 PM
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Quote:
Originally posted by 93 325i@Jan 17 2005, 04:39 PM
Mine does the same exact thing..It is lifter noise. When it's cold outside the oil is thick and it takes a couple seconds to get circulated again. From all the research I have done is that this is a common noise and unavoidable.
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i've seen some people putting the m3 s50/s52 timin gchain tensioner on the m50, is this ok, i mean will it harm on something?

please let me know i already got the tensioner and i just need to know if its ok to put it in... thanks..

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#4 (permalink) Old 01-18-2005, 11:27 AM
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my car just did that today... but it was below freezing... i think it was around 10 F...
so basically just ignore this noise, right?

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