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Old 10-01-2010, 09:41 AM   #140 (permalink)
Dr. Jerryrigger
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Join Date: Jun 2010
Location: mass
Posts: 181

The Sh*t-Box - '99 Subaru Impreza Outback Sport
90 day: 27.81 mpg (US)
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Is the idler just a smooth roller, or does it have a lip the belt sits in? If it's smooth than it will walk as much as things are out of alignment, every revolution, until that adds up to a length that will do something. One thing that may be ****ing things up could be the idler hole not being 90deg, a fraction of a degree could mess things up.
The best advice I can give is to look at the pulley on your accessories. They all have a lip which keeps the belt from walking. Getting things lined up as best you can would be a good objective, but I don't think you'll be able to get things close enough to prevent walking with out something physically blocking it.
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