Noise from timing belt

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richard
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Post by richard » Sun Jun 12, 2005 11:08 am

Alan, you are right, the noise only comes as things strart to warm up. Bearing in mind I had taken the car on a 70 mile run before I discovered this problem means it's most likley to drive the 15 miles to him! I hope!

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Post by richard » Sat Jun 18, 2005 1:46 pm

I took the car back yesterday. He stripped the timing belt down 4 times and on each occasion, the noise was still there. Only culprit left is the water pump that was also replaced last week. That is going to be replaced next week at some point.

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Post by AlanS » Sat Jun 18, 2005 3:15 pm

Just out of curiosity, it wouldn't happen to be the harmonic balancer by any chance?
They can make some really weird noises and be hard to detect if they're on the way out. Common trick to detect a failure is to place a white line across the face of the pulley, go for a drive and see if the line is still straight across when you recheck. If the straight line is broken, the vulcanized part is coming adrift. These often get mistaken for a loose ancillary belt, squeaky water pump amongst other things.


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Post by richard » Sat Jun 18, 2005 4:26 pm

I dont think my bx has this part. I know some Xantias do.

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Post by AlanS » Sat Jun 18, 2005 11:23 pm

It is the pulley that the auxilary belt runs on that's connected to the end of the crankshaft.

I helped someone out here identify one off a diesel private import XM a couple of weeks ago and he posted a pic.
You can see on the new one where the rubber is and that's why a white line painted across it is so simple a way to diagnose a failure.

http://www.aussiefrogs.com/forum/attach ... entid=4809


Alan S
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Post by richard » Mon Jun 20, 2005 7:30 pm

Hi

My crankshaft pulley seems to be made of steel with no rubber centre.

My Xantia has a rubber centre!

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Post by richard » Sun Jul 03, 2005 9:56 pm

Well, the saga continues. After a few weeks of on and off fiddiling by the cit specialist the noise still remains!

He has in the last 2 weeks removed and refitted timing belt several times, run without alt or hp pump, removed cam cover and inspected internals, fitted another water pump, and on Friday he replaced the timing covers.

Still the bloody noise remains!

It cant be anything serious as he would of found it after all the work he has done so far. But I want the noise gone as it makes the car sound like a shitheap!

Otherwise, the car runs sweet!

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Post by AlanS » Sun Jul 03, 2005 10:58 pm

Richard,

Have you tried using an engine stehoscope on it by any chance?
I have one that I use for this kind of work and it is particularly sensitive, so much so, I can actually hear injectors ticking through it. If nothing else, it should single it down to one particular area.
Sucking or blowing sir is best found using a short length of hose, but anything mechanical the stethoscope is the go. Mine was only about A$10 (3/4 UK pounds) so a handy item in the tool box. Incidentally, much more sensitive and accurate than the old screwdriver against the ear trick. :wink:


Alan S
By the time you're old enough to know it all, you can't remember why you were learning.