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Old 10-15-2010, 03:24 PM   #1
q2brass
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Default Timing Belt Issues

I've been having an issue with my timing belt getting chewed up and creating black belt shavings.

I believe part of my problem is a bad idler pulley. I did replace all but the small one on the drivers side. It seems that small one that I didn't replace is causing part of the issue. It spins fine.... but it has marks on it from the belt.

It also seems like the timing belt is walking forward enough that it is hanging 1-2mm over the edge of the idlers. So, I guess my question is: Am I missing a washer behind the idlers pulleys? I don't see anything in the service manual showing a parts break down. I believe its bolt -> pulley. Or Is it supposed to be Bolt -> Pulley -> Washer.

My plan is to replace the small pulley, but is there something else that I'm missing?
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Old 10-15-2010, 03:50 PM   #2
dads_cruizzzer
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When I did my timing belt, the smallest pulley was the ONLY one I replaced. Before I replaced that one, there was what I thought was a/c compressor pulley noise. After replacing, the noise is gone.

I don't remember any washers between the pulley and block. The cam gears should keep the belt in line. Maybe that small pulley is really bad that it's cocked at an angle causing the belt to walk.
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Old 10-15-2010, 04:17 PM   #3
AQ Motorsports
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There is a washer behind the tensioner, and if that's not there it won't tension properly. There are also guides for the belt that could be too tight.
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Old 10-15-2010, 05:10 PM   #4
nhsilversti
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guides for the belt over the crank and by the cam gears are set too tight is usually the cause of belt "dust"
the small idler is 99% of the time a must replace item, it spins at 2x the speed of the bigger ones. replace it and your belt walking problem will prob be gone.
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Old 10-15-2010, 05:25 PM   #5
q2brass
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I will double check the guide clearance when I get home. Now I need to go order a timing belt and smaller pulley. I think the tensioner is fine, it's new and has all the washers.
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Old 10-15-2010, 09:25 PM   #6
dads_cruizzzer
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Here's a tip on installing the guides.

- Get a flexible sheet of the thickness that you want to be the gap.
- Cut it about 3/4" wide x 3" long.
- Slip it under the guide.
- Press down on the guide with the spacer underneath.
- Tighten the bolts.
- Remove gap spacer.

I actually only removed one guide. I duplicated the gap from the one I did not remove.

Check out Import Image Racing for the belt kit. Ask Josh for the heavy duty guide over the crankshaft.
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Old 10-15-2010, 09:38 PM   #7
norexyet
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Has to be to tight guide clearance. I'm pretty sure factory manual says .020"-.040". I always set them to .030" with some feeler gauges.
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