Underdrive pulley belt clearance

emcobra · Jun 21, 2004

Ok I installed a set of ASP Aluminum UD Pulleys removed smog and routed belt like this pic below. I ended up with a 89.5” belt fit nicely but the clearance between the water pump pulley and the idler pulley is very tight I’m talking 1/8 to 1/16 of inch with belt on. Is that normal? Also when start I think the belts rub for a second because it squeals, but after start there is no noise.

Modified pic from Stangfreak95 thanks.

Edit:fix pic

SN95StangMan · Jun 21, 2004

I have about the same amount of clearance too, but my belt doesn't rub when I start the car.

Kevin R. · Jun 21, 2004

I actually used the same size belt...

It seemed tight at first but it will loosen a little bit.

I don't know about the rubbing though.. If it's just when it starts maybe it quickly loosens a bit so it doesn't squeal...

They do make a 89.7 belt though, you may want to check that out..

revhead347 · Jun 21, 2004

I used the same belt with my pullies. As long as you have clearance, you are fine. The belt will be a bit tight till it stretches. On my car, the tensioner clattered, because it was hitting the stop. I had to use the dremel to grind back the stop a little to stop the clatter.

Kurt

emcobra · Jun 21, 2004

Well that good to know on the clearance, Ill give it few days see if stretches out a bit.

94GTLaserRC · Jun 21, 2004

You guys are wrong. The reason a belt squeals at first is becaust it is TOO LOOSE. Therefore it slips (causing the noise). When the belt heats up, it grabs better and squeals less. If the A/C compressor is on, it will squeal even more, since there is strain.

You have to look at the pulley tensioner notch and see where it lines up. That will tell you if it is too loose or tight.

RC

Underdrive pulley belt clearance

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Apparently my ex-husband made that mistake.

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