V6 cambelt slipping off pulleys? - Alfa Romeo Forum
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(Post Link) post #1 of 7 Old 11-11-07 Thread Starter
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Help V6 cambelt slipping off pulleys?

Hi All,

More of a lurker than a poster here, but usually can find answers by searching. In this case I need some advice please

My '98 156 V6 had the belt, tensioners, water pump replaced @ 60k by an alfa specialist 2 years ago. Car is at 90k. Recently noticed a noise from behind the cambelt cover that changed when I pushed on the cover - so took the top cover off to have a look. It seems the belt has slipped by about 5-6mm from centre (judging by polished/clean looking marks on idlers) and several mm are now over the edge of the pulleys/guides. The edge of the belt is now scraping on the bottom cover and showing evidence of some wear as a result - only slight wear though so may not have been like this for long.

Questions that I hope a knowledgeable AO person can answer:
  • How might this have happened - what keeps the belt central in normal circumstances?
  • Am I likely to be able to reposition belt relatively easy with a little further dismantling or is a full cambelt and tensioner change recommended? Was hoping to get another while out of the existing belt!
  • Would people drive the car in this condition - even just as far as the specialist (15 miles)? Or do I need a trailer

WOndering if it's worth doing anything on the car as it needs clutch/suspension work/gear linkage work/brakes/tyres and all that costs more than the car is worth already without doing the cambelt too!

Anyway, all advice gratefully received!

Paul

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Re: V6 cambelt slipping off pulleys?

Definatley don't drive it. What will have happened is the timing belt tensioner will have partially collapsed and leaning over running the belt into the cover. Get it seen to asap.
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Re: V6 cambelt slipping off pulleys?

I had an Escort deisel van that had a belt slip off the pulleys. Cost me £800 for a new top half of the engine. I wouldn't drive it, if it goes you know your gonna be in the brown stuff. Trailer or tow it. As for 'is it worth getting it repaired' Well, I just payed what my car was worth for a 72,000k service plus extra works that required doing. It was worth it for me as I intend to keep the car for as long as possible as I love it to pieces.

You need to decide if it's a keeper or not.

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Re: V6 cambelt slipping off pulleys?

Yep something has gone out of alignment and it needs looking at before you run it. Most likely collapsing or loose tensioner. It won't be cheap to fix as effectively you are having a new cam belt again, but its cheaper than a busted engine for sure.

Shame really, but at least you caught it in time.

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(Post Link) post #5 of 7 Old 11-11-07 Thread Starter
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Re: V6 cambelt slipping off pulleys?

thanks for the advice guys. Not great news but TBH I suspected I'd be needing a new belt at the least and might aswell change tensioner and pulleys too. Interesting that you suspect the tensioner - makes sense that a partial collapse would shove the belt to one side.

Funny thing is the noise was quite faint and I only noticed when getting out of the car with the engine running to load some bags before a drive. Decided against taking my car as a precaution - might have been a short (and expensive!) trip if hadn't gotten out and heard it!

So I've reached that point familiar to many on here - do I spend more than the car's worth to get everything sorted or flog it for parts/repair and move on! Any Irish members looking for a V6 project car? ;-)
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Re: V6 cambelt slipping off pulleys?

£400 for new belt and tensioners, half the value? I think not, repair and enjoy it.
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Re: V6 cambelt slipping off pulleys?

Quote:
Originally Posted by Phil J View Post
£400 for new belt and tensioners, half the value? I think not, repair and enjoy it.
Last cambelt change ran close to €1k (although that included waterpump) and there's other work needs doing (such as the clutch) - so I am running into a significant percentage of the car's value.

In saying that - I'll admit to just fancying a change (such as updated interior and a bit of leather... ) :-)
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