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-   -   Z3 1996 Z3 Roadster - Start Up Squeek (http://www.bimmerfest.com/forums/showthread.php?t=666197)

htmnc 12-26-2012 09:34 AM

1996 Z3 Roadster - Start Up Squeek
 
When I start up my Z3 when it has become cold (such as overnight) it makes a squeek sound like a belt that has to warm up and then stop making noise. It lasts about three minutes.
My mechanic has noted that it is time for a new timing chain (or belt???) and a radiator flush. Could this be the cause?
It is not a crazy, insanely loud sound, just sort of high pitched whirring.
Thanks!

vintage42 12-26-2012 01:08 PM

Belts can squeak. Get a tube of belt dressing and dab some on the belts - it will spread itself around. I don't like the spray dressings because only a little gets on the belt.
If the belts are still 1996, they should be changed.
The timing chain is permanent, internal, oil-lubricated and does not squeak.
Flushing the radiator will have no effect on the noise.

crappyattitude1 12-26-2012 01:21 PM

Could be.....
 
Tensioner (idler) pulley bearings.....

Crappy : )

(Just outside of Nashville)

vintage42 12-26-2012 01:27 PM

^^ and new belts.

Bellarose 12-27-2012 01:38 AM

Had the same problem -- 2001 Z3 with 13,500 miles. I changed the belts and squeaking stopped.

Blacklane 12-27-2012 06:40 AM

Additionally, if you are having belt issues, it could be an indication that they are original and need to be replaced. That's also an indication that the cooling system has not been replaced. After about 80,000 miles, the plastic pieces in these cooling systems becomes brittle, can break catastrophically, and quickly ruin an engine.
It may be time for a complete cooling system replacement including: belts, hoses, water pump, radiator, coolant reservoir, thermostat, thermostat housing, and if it's a 1.9: two more plastic pieces on the engine.
If that has been done, I would consider idler pulleys. A mechanic can usually quickly isolate the noise using a piece of hose or stethoscope.

Pinecone 12-27-2012 10:45 AM

If your mechanic is telling you to replace the timing chain due to age, find a new mechanic.

BMW has not used timing belts for MANY years.

vintage42 12-27-2012 01:09 PM

Quote:

Originally Posted by Bellarose (Post 7272820)
Had the same problem -- 2001 Z3 with 13,500 miles. I changed the belts and squeaking stopped.

But before he changes belts, a dab of belt dressing might be worth trying.

ALM168 12-29-2012 11:47 AM

Standard wisdom says not to spray belt dressing on serpentine belts (check the warning on the can). You might try spraying pain old water on the belt to see if this quiets it down. If it does, then you need to replace your belt(s). I had some temporary relief on a squeaking belt on a non-BMW car by putting some Comet cleaner on the belt. It removed the glaze from the belt...but in end, the belt needed to be changed.

Bellarose 12-30-2012 01:10 AM

I was very lucky with a rare find 2001 z3 2.5 with 13,500 miles. show room condition. Belts squeak -- with car being 11 years old I replaced belts, battery, oil. She runs great !!

vintage42 12-30-2012 04:26 AM

Quote:

Originally Posted by ALM168 (Post 7277604)
Standard wisdom says not to spray belt dressing on serpentine belts (check the warning on the can)....you might try spraying pain old water on the belt to see if this quiets it down.

I always use the dressing in a tube, put a dab on a finger tip, and rub a little of that here and there on the accessible sections of the belts. That's all it takes. I would not spray belt dressing because most of it gets all over the engine with very little getting on the undersides of the belts. I think water might momentarily quiet a belt. But if the belt is slipping, the lasting adhesion of dressing is needed rather than the temporary lubrication of water.

Dressing is a stop-gap measure to quiet noise from a loose or misaligned or worn belt. The condition causing the noise needs to be addressed sooner or later.


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