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Broken timing belt: No nasty noises = ???

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Old 06-23-2005, 10:00 PM
  #16  
Peckster
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Originally Posted by Tom M'Guinn
I'd slap a belt on it, run a compression test, and see how well it runs. Cars have been known to run ok after low-rpm belt failures. If you bent the valves, might as well get your own head redone, rather than buying a new one. If you R&R the head, getting it machined does not cost all that much.
I wouldn't risk it if it were mine, there might be slight damage to a valve stem. Pull the head and look for marks on the pistons. Even if you can't see any, get the valves checked with a jig and dial gauge.

I agree about getting your head fixed. How old were those belts?
Old 06-24-2005, 01:38 PM
  #17  
faithless
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What is the official "time between changes" for a timing belt? I've never seen it written down. Do most shops use the same time interval?
Old 06-24-2005, 01:41 PM
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Jakerx
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30,000 miles. just because of what i went through last time it happened, i have absolutely NO problem changing it every 30k.

i had no idea when the PO changed the timing belt, so a couple months after i bought it, on the way to the shop to have it done since i was in school at the time and didnt have any time to do it, the belt broke
Old 06-24-2005, 01:46 PM
  #19  
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Originally Posted by ClarksGarage
On 944s, the timing belt and balance shaft belt should be changed at 45,000 miles. For 968s, they should be changed at 60,000 miles. For both the 944 and 968, the belt condition and tension should be checked every 15000 miles. The 15,000 mile inspection interval assumes that the car has bee driven on a regular basis. If your timing belt is two years old and you have not reached the 15000 mile inspection interval, the timing belt tension and condition should be checked then and once per year after that.
Here it says 45k, but I would agree to do it earlier than that just to be safe.

Jake, sorry that Murphy took it out on ur belt.
Old 06-24-2005, 11:09 PM
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docwyte
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Mine has 15k on it, but was changed 6 years ago. I'm getting it done this week...
Old 06-24-2005, 11:27 PM
  #21  
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Originally Posted by docwyte
Mine has 15k on it, but was changed 6 years ago. I'm getting it done this week...
Thats just wrong, lol. I'll put 15k on this year alone
Old 06-24-2005, 11:31 PM
  #22  
docwyte
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Just bought the car last month. The previous owner drove it 4k miles in the last 2.5 years. I've already put over 1k miles on it this month and it's not my daily driver! Course, that includes the 500+ miles to drive it home when I bought it...
Old 06-25-2005, 12:45 PM
  #23  
JoeN951
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docwyte...don't forget to have all the rollers replaced, from what I have been told most if not all timing belt problems are caused by the rollers failing
Old 06-25-2005, 12:50 PM
  #24  
docwyte
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Yep, I'm going to replace those, the tensioners, all the seals and the water pump while I'm at it...
Old 06-25-2005, 04:35 PM
  #25  
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On my previous car, which i had for 8 years and put some 100K on the car, I change the belt every 45K. And never had a problem.(after the first week I owned the car,when my belt broke and damage the valves). During this time I never touch the water pump or the rollers. my theory is simple: the less you mess with it, the less it breaks.

Regards,
AL



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