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#1
11-16-2008, 09:44 PM
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Drive Belts Issue.....Please Help......
About three weeks ago, i replaced the thermostat, water pump and two drive belts. When replacing it, i accidently loosed the pulley and adjusting bolt above the tentioner. i though I tightened i put everything back in right, but three weeks later here I am.  Any suggestion where i may have screwed up with the install? or is there a proper way of tightening the pulley i loosened? or any other reason new belt would snap like that? 
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#3
11-16-2008, 11:08 PM
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There is no direction of the belt, just proper routing. And usually if a belt pops it is because a component failed/locked up.
But the idler pulley above the tensioner has a keyway type bump to line it up properly, and if it was improperly positioned the pulley would be angled and throw the belt. But it wouldn't have taken 3 weeks... Now you said the main belt snapped. Did it break in half, or get thrown off in one piece? If it broke in half... twice, then either one of the pulleys or something else turned by the belt is seizing. With the belt off turn all pulleys by hand lookgin for one that may be seizing, including the altenator as that is what I would suspect.
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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#4
11-16-2008, 11:27 PM
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i didn't find the belt. i found a few shreds mangled around the AC and so forth but didn't find the main pieces. I will check all the pulleys to make sure they turn. i haven't heard of an alternator seizing before? Is that common with the X5?
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#5
11-17-2008, 12:18 AM
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Not really, but it does happen. It could also be the ac compressor seized, but would only seize the belt with the ac clutch engauged... try tirning the ac pulley, then turning the key on and the ac on and try turning it again.
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is
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#6
11-17-2008, 06:53 AM
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Those plastic pulleys are a well known failure issue on the 8-Series cars and they use the same engine. They crack and then shatter, or overheat and fall apart if the bearing fails. There are some really nice anodised pulleys available made from aerospace aluminium and with replaceable bearings from Tom at www.wuffer.net and look under the PhoenixMotorsport tab.
They are not cheap but neither is a new rad, hood, waterpump and AC compressor, and thats if you don't overheat and do a headgasket. Good insurance and they are on my wish list. X5Girl, xxx
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#7
11-17-2008, 08:05 AM
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Quote:
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#8
11-17-2008, 09:24 AM
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Quote:
Pic shows them on an M62 V8 E31. And you can choose a color! Pretty though arn't they and 100% functional too. I think I will get all 3 in BMW royal blue. Need an excuse to fit them? Ask someone who has had a catastrophic failure at $1500+ if THEY wished they had done them! X5Girl, xxx.
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