Thread: Squealing belt

Inspired by this post i've just checked pulled tensioner of and eveything looks allright bearing was as it should be (only few months old). Then checked all pulleys and they seemed ok except were all grooves were full of crap. I cleaned all grooves out and put belt back on the noise was horrendous so i squirted it with some belt conditioner and noise dissapeared. Have done 100 ks since and stopped several times and noise has not returned. So just check and see if all the grooves are clean first rad97 it may be just that simple i hope this is the case with mine. I have my fingers crossed.

Makes sense, as it would be rubber rubbing on rubber = noise.

Did you wire brush the dried crap out of the grooves?

nice cleaning the grooves out.

If the tip of the V rides on the crud and the sides of the Vs cant bite into the pulley, it will slip

used a straightedged screwdriver just slightly smaller than the grooves. water pump and alternator grooves hardest too clean as youhad to turn by hand. Others were done with engine idling and great care to avoid loss of fingers.

If you do a search there have been plenty of belt squealing posts in the past.
My money is on the idler puller, if you look at it side on you may notice it is slightly out of square to the belt , thats what causes the squeal and subsequent belt failure. Thats probably why you have rubber in the grooves. Have a look at the driven belt and if there are small rubber blobs on it, its the idler.


john

Originally Posted by karcraft1

The main problem with squeling is caused by the belt.

Some makers (Dayco) have a smooth finish on the back which in most cases people have a problem. Other makers (Lemforder) have a "rough" finish on the back and problems are non existent.

Hope this helps.

Nice to have you on board karcraft1 !

If you've got a TD5 then it's worth checking that the squealing isn't caused by something totally different from the serpentine belt. I went through a similar issue some months ago and it turned out that the squealing was actually caused by sheared exhaust manifold bolts allowing exhaust gases to escape at the gasket. The squealing was caused by the gas escaping under high pressure much like a kettle whistle.

Russell

Originally Posted by pawl

Dayco who make the genuine 300Tdi one for LR also sell the tensioner part# APV1004 cost only $93, better than what many others charge.

where do you get it at this price? Direct from dayco?