Pully or damper noise?

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REman
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Pully or damper noise?

Post by REman »

Hello,

Having lots of squeeking, scraping noise, for lack of better description coming from crank shaft pully or vibration damper I think, well after engine warms up, not cold. Localized it by spraying lubricant between pully and damper. Goes away for a while but comes back. Wondering also if related to rough idle startups(engine shakes) for about 10 seconds, not related to choke as much as maybe the damper maybe?

Anybody have any suggestions or confirmations helpful as always.

Thanks you!
'81 528i... mfg date 10/80...owned since 1990
canada karl
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Re: Pully or damper noise?

Post by canada karl »

Are you sure the water pump isn't seized up?
1976 530i. BMW 59 Triumph TR3A(rolling resto). 67 Triumph TR4A(salvageable). 86 900S Winter car
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REman
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Re: Pully or damper noise?

Post by REman »

Yes, it seems the noise goes away after I spray lubricant between the pully and damper. Water pump is only 2 yrs old.
'81 528i... mfg date 10/80...owned since 1990
canada karl
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Re: Pully or damper noise?

Post by canada karl »

What kind of lubricant are you spraying on there? Try to use something more substantial than WD40.
1976 530i. BMW 59 Triumph TR3A(rolling resto). 67 Triumph TR4A(salvageable). 86 900S Winter car
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Mike W.
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Re: Pully or damper noise?

Post by Mike W. »

I've heard of dampeners separating, not on BMWs, but I suppose it's possible. So crawl under there and see if it feels tight. Work a big screwdriver in there and try to wiggle it. Look for wobble while it's idling. A bit of a PITA for troubleshooting, but try pulling the belts, or at least loosen them as much as you can to try to determine location. Also look closely, there might be something stuck behind it rubbing, even a twig or something.

It's involved with warm up, that's all in the FI system and timing, there is no choke and unlike newer cars, no crank sensor so nothing that would be affected by it that way.
Mike W.



1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
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REman
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Re: Pully or damper noise?

Post by REman »

Got under car as suggested and there was no wobble in damper while running, and not loose when wedged with big screwdriver. From underneath is louder sounds like it is internal in engine, maybe the oil pump?

Hopefully the attach drop box link will let you hear the birds chirping lol.

"C:\Users\ivan9\Dropbox\E12 New Engine noise.mp4"

Spray used was blaster max synthetic.
'81 528i... mfg date 10/80...owned since 1990
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REman
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Re: Pully or damper noise?

Post by REman »

Trying the link of the noise again...

https://www.dropbox.com/s/wmvkmybyw0uu6 ... e.mp4?dl=0
'81 528i... mfg date 10/80...owned since 1990
PatinaBeforePolish
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Re: Pully or damper noise?

Post by PatinaBeforePolish »

Sure sounds like the alternator or water pump, possibly worn belts or pulleys. Have you tried isolating the sound by listening with a stethoscope or screwdriver?
79 528i
76 530i - Stored since 1992, can it be brought back to life?
86 944- 2023 project
78 F150- Everyone needs a truck
canada karl
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Re: Pully or damper noise?

Post by canada karl »

Yes put a stethoscope on the the alternator. It could be the bearing in there that is failing. Or maybe a poor aftermarket water pump? Be careful with the stethoscope....don't get it caught in any moving parts.
1976 530i. BMW 59 Triumph TR3A(rolling resto). 67 Triumph TR4A(salvageable). 86 900S Winter car
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REman
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Re: Pully or damper noise?

Post by REman »

Yes in fact did use a stethoscope and big screwdriver while under there yesterday and still could not isolate it. Do agree maybe it is just belts or pulleys but not the alternator or water pump. Suspect pulley the most as subsides when sprayed with lube.
'81 528i... mfg date 10/80...owned since 1990
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Mike W.
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Re: Pully or damper noise?

Post by Mike W. »

Then is the crank pulley solidly bolted to the crank hub?
Mike W.



1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
User avatar
REman
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Re: Pully or damper noise?

Post by REman »

Yes, did not budge at all when wedged with big screwdriver or grabbed with both hands to see if any movement.
'81 528i... mfg date 10/80...owned since 1990
PatinaBeforePolish
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Re: Pully or damper noise?

Post by PatinaBeforePolish »

Intriguing. Does it go away at higher rpm? Or does the pitch increase?
79 528i
76 530i - Stored since 1992, can it be brought back to life?
86 944- 2023 project
78 F150- Everyone needs a truck
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REman
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Location: Orlando FL
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Re: Pully or damper noise?

Post by REman »

Haven't noticed it getting louder at higher rpm, just as the engine warms up and then steady at idle.
'81 528i... mfg date 10/80...owned since 1990
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maybeillbuyit
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Re: Pully or damper noise?

Post by maybeillbuyit »

Its an odd sound. I've had a strange noise on my 77 the whole time I've had the car. Tried everything. Mine is more of a chirping at idle that goes away ay higher RPM. Another thing I tried was one at a time removing the Vbelts and see if it stops. Even the water pump belt, I just didn't let it run long obviously . It was a while ago and I don't really remember the outcome :shock: But the car still does it so I guess it didn't narrow it down.
1977 530i another project
1979 635csi Euro "project"
1987 635csi
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