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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 07-06-2014, 04:14 PM
IS325 IS325 is offline
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Mein Auto: 325is
M20B25 E30 325is Engine Rattle

Hi guys,

Just got my 4th E30! A seriously clean 325is (2.5l M20B25). The car had been in storage for nearly 5 years without being started or driven. When I was looking at it the guy who had it in hes garage made the mistake of starting it with the 5 year old oil in it... I still bought it despite this.. I know these engines are noisy however this one is louder than normal.

From cold the engine makes a clear rattling noise... I can only describe it as sounding a bit like a diesel (from the actual engine it seems).. The exhaust note sounds normal. The rattle is there on idle but not very loud, the rattle increases with RPM. It gets a little quieter once it warms up but can still be heard. The rattle does not get louder when there is load on the engine, if anything it gets harder to hear when there is load on the engine. At higher RPM (5,000 or so) it definitely gets louder and clearer to hear. Driving normally with the radio on you would not notice the rattle. I know the previous owner (before it was in storage) had problems with the head gasket and it had been using a bit of water. I've been driving it all weekend and haven't had that problem but without any doubt the rattle is there. The rattle is heard on DE-acceleration when you lift off at higher RPM. As above my best description is that it sounds a bit like a diesel, like a 'clatter clatter'.. it doesn't seem to lack power. It does not blow any smoke at all.

Not sure if it's relevant but the engine runs unusually cold. In start stop traffic it will get to quarter temperature but driving at speed it stays in between the Blue cold marker and the first indicator.

I'm hoping it's not a terminal engine problem but I accept that the engine may be damaged.. I'm just after some advice on what to look at and if it is serious whether it's likely to be in the top or bottom of the engine..

Cheers
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  #2  
Old 07-06-2014, 06:28 PM
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downhiller downhiller is offline
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adjust the rockers.

t-stat could be shot or the temp gauge is coated with something. drain coolant, do a engine/radiator flush, change t stat and put new fluid in. since its sat for years


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  #3  
Old 07-08-2014, 05:51 PM
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BMWFatherFigure BMWFatherFigure is offline
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Big end(s).
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  #4  
Old 07-08-2014, 08:25 PM
logantv logantv is offline
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I agree with downhiller, sounds like the thermostat is stuck open. Since it's your fourth one you probably already know this would be a good time to do the timing belt if you're already draining coolant.

Is it the fast sewing machine tick of out of adjustment valves (rockers) or is it a slower speed noise?


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  #5  
Old 07-08-2014, 09:44 PM
IS325 IS325 is offline
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Hi guys, it's a slower noise, not like tappets or something.. I'm starting to think my engine might be cooked after doing a bit of reading? The noise doesn't sound constant and kind of fades in and fades out though..

I recorded a video, here it is, take a listen.. what are your thougths?

[URL="
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  #6  
Old 07-08-2014, 10:10 PM
IS325 IS325 is offline
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As it's my first thread I feel I should post some pics of the actual car as well here you go.. 325is.. pretty clean car.. I love it
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  #7  
Old 07-09-2014, 02:35 AM
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BMWFatherFigure BMWFatherFigure is offline
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Nice. Salmon Silver?
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Previous:
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  #8  
Old 07-09-2014, 06:17 PM
IS325 IS325 is offline
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The colour is lachssilber..

Guys, anyone got any thoughts on the video?
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  #9  
Old 07-10-2014, 08:39 PM
IS325 IS325 is offline
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Quote:
Originally Posted by logantv View Post
I agree with downhiller, sounds like the thermostat is stuck open. Since it's your fourth one you probably already know this would be a good time to do the timing belt if you're already draining coolant.

Is it the fast sewing machine tick of out of adjustment valves (rockers) or is it a slower speed noise?


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Hey there, any thoughts after hearing the video?
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  #10  
Old 07-14-2014, 11:20 PM
IS325 IS325 is offline
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Anyone?
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  #11  
Old 07-15-2014, 03:47 AM
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BMWFatherFigure BMWFatherFigure is offline
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Yep Salmon Silver - Try Google translate...........
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Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #12  
Old 07-21-2014, 08:19 AM
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Nick323 Nick323 is offline
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The video you posted is too inaudible, but the symptons you describe sound like piston slap
I hope I am wrong...
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