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What exactly do you need to replace. Take a look at the attached parts diagram. The tensioner pulley itself, #8, is 996.102.117.57 (the latest version part number). But are you sure it is the pulley. There is also the arm, #3, dust boots (#7) and the tensioner itself, #2.

tensioner .pdf

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On a related subject. My tensioner don't seem to be giving enough tension and allows the belt to slip a little at key times (e.g. startup). Is it possible to adjust the tension level?

New belt needed. Tension is supplied by this unit - either tensioner has a defect or belt is the issue. This is not an issue to ignore. Loren could confirm but I think the belt is rated for 50K miles or five years?

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  • Moderators

Fortunately, the tensioner is pretty sturdy and does not crap out very often; usually, if it has to be accessed, it is because someone screwed up the tensioner pulley mounting bolt, requiring the replacement of the arm. Then the fun begins……..

I also would not go the recommended distance on the serpentine belt; it is a relatively inexpensive item, but can leave you stranded on the side of the road, if not the new owner of a boat anchor where your engine used to sit. I would also recommend keeping the old belt in the car as an emergency spare due to the fact that many shops do not carry belts in the same size.

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  • 9 months later...

What happened in the end?

With the belt removed, my belt tensioner doesn't spring back the full distance. I can apply slight anti-clockwise pressure on 24mm wrench on tensioner pulley & the arm moves a bit further up. Is that a sign of a faulty belt tensioner?

Also with the belt back on & engine running the belt tensioner pulley has a bit of a buzz to it (felt through a screwdriver held against 24mm bolt in pulley).

Is it just the pulley bearings giving up or the slack in the belt tensioner causing the vibe/buzz?

Thanks in advance.


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