squeeky serpentine belt argh!

**86mud** · 22nd April 2009, 09:41 AM

Hi all

As you can all see from my previous thread that I have just replaced my serpentine belt and air con belt on my 300tdi. No I have an annoying fan belt squeek. First of all, it was all the time - at idle and through the rev range.

I looked closely at the belt this morning to make sure it was fitted correctly. The new belt had no directional markings (it is a dayco brand). Today I changed the belt around and now it doesn't squeek at idle but still squeeks through the rev range.

The squeek is coming from the flat surface of the tensioner pulley. I tried a bit of soap and I even tried some steel wool on the surface, but this didn't work.

Any ideas? Is it just a new belt "wearing in"?

Cheers
Andrew

**rovers1952** · 22nd April 2009, 10:23 AM

When I had this problem on my D1, the tensioner pulley arm where it spring pivots was shot resulting in the pulley running "off-true".

**Graeme** · 22nd April 2009, 11:59 AM

Have you checked that its not the bearing in the tensioner pulley?

**86mud** · 22nd April 2009, 12:03 PM

The pulley ran fine with the old belt yesterday before I changed to the new belt.

Funnily enough the squeek is "highlighted" when the writing on the belt runs around the pulley...

**86mud** · 24th April 2009, 07:08 AM

I've narrowed it down to the alternator pulley.

I have noticed in the last few days that the alternator light has been coming on at speed/high revs and this is when the serpentine belt squeeks. So i am guessing the alternator might be on the way out - the alternator must be struggling to turn correctly at high revs.

siacci · 26th January 2010, 03:43 PM

Dah, I didnt look at the date.

Dave

**dullbird** · 26th January 2010, 04:12 PM

Originally Posted by 86mud

I've narrowed it down to the alternator pulley.

I have noticed in the last few days that the alternator light has been coming on at speed/high revs and this is when the serpentine belt squeeks. So i am guessing the alternator might be on the way out - the alternator must be struggling to turn correctly at high revs.

you got the correct size belt then?

**Ranga** · 26th January 2010, 04:18 PM

I just had a squeaky serp belt problem until about 2 weeks ago. Dry lube/soap/crayon all shut it up for about 30 minutes, then it would return.

Whilst getting it serviced at MR Automotive, they changed the belt, cleaned out all the grooves on each pulley, and still couldn't get rid of it. Eventually, they fixed it by replacing the tensioner pulley. Wasn't as cheap a fix as I hoped, but them's the breaks...

I think it cost about $150 to replace, including labour, but my memory fails me right now.

**dullbird** · 26th January 2010, 04:54 PM

My Squeak became apparent after changing for a new tensioner.....what had happened was I had put a belt on that had a shiny back, the garage changed it for a rough backed belt (very rough actually) and the squeak disappeared instantly.....

**86mud** · 27th January 2010, 11:52 AM

I am still yet to eliminate the squeek when using a brand new belt.

I am just running around with the old belt.

It must just be the tensioner. I was thinking of running some sand paper on the wheel to "resurface: it.

Just one of the jobs that got forgotten.

Cheers
Andrew

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