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Old 11-18-2010, 05:42 PM   #1
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YJ serpentine belt

My serpentine belt came off and I think the idle pulley did as well but when I try to put the belt on it is way too long. Not sure exactly where the idle pulley is supposed to attach to. Its an '88 4.2l straight 6.

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Old 11-18-2010, 06:12 PM   #2
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it bolts to the front of the a/c mount. looking from the front it is on the left and is the top right hand bolt hole closest to the thermostat. when bolted on, the idler sits on top of the sepentine belt.

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Old 11-19-2010, 01:04 PM   #3
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some pics
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Old 11-19-2010, 06:29 PM   #4
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Here are pics of mine. Mine doesn't have a/c. Don't know if that makes a difference. Maybe I'm just not sure how to run the belt.Click image for larger version

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Old 11-19-2010, 06:43 PM   #5
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google "jeep 4.2 belt routing". there are many sites with diagrams. chrysler has one with 12 diagrams or so.
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Old 11-20-2010, 04:17 PM   #6
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Ok I pulled this picture and I think it is what is missing. Problem is that I do not know what the mount is called and am having a hard time finding it.
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Old 11-27-2010, 09:44 AM   #7
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ok now im looking at all these pictures and im wondering why my power steering resevoir is mounted to the fan shround and not the pump. any one else ever seen that
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Old 11-27-2010, 09:52 AM   #8
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mine is nounted to the fan shroud. look at my second pic. mine is a 4.0 ho
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Old 11-27-2010, 03:37 PM   #9
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Have a '92 yj, and when the temperature heads below zero the belt/fan area on the jeep makes a screeching sound until the jeep warms up. I was told this was the idoler pulley not having compatible grease for the cold. But I can't help but think there is more to this the. Just a pulley. Any thoughts?

Could it be a failing thermo-fan assembly?
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Old 11-27-2010, 06:43 PM   #10
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spray a little belt dressing on the belt. i just did mine. we were in the teens for the first time in years. it helped mine.
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TREAT EVERY STRESSFUL SITUATION AS A DOG WOULD.
IF YOU CAN'T EAT IT OR PLAY WITH IT,
JUST PEE ON IT AND WALK AWAY.
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Old 12-01-2010, 10:42 AM   #11
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Quote:
Originally Posted by NAVYCHIEF View Post
mine is nounted to the fan shroud. look at my second pic. mine is a 4.0 ho
Ok every time i tell people that they think im crazy
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Old 12-01-2010, 11:13 AM   #12
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Quote:
Originally Posted by MMata77
ok now im looking at all these pictures and im wondering why my power steering resevoir is mounted to the fan shround and not the pump. any one else ever seen that
Quote:
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spray a little belt dressing on the belt. i just did mine. we were in the teens for the first time in years. it helped mine.
I have done the belt dressing route on my old belt with little elimination for the squeal. I had my belt replaced about 3 years ago with a Kevlar one that no longer needed dressing, and at the time had the shop look at everything they couldn't find any problems. And yet when the temptation gets below -10 something squeals. Some have speculated that the clutch on the fan requires changing, but then would it have issues with over cooling during winter? It is crazy.
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Old 12-01-2010, 11:24 AM   #13
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I just replaced the belt on my yj a few weeks ago. I too have a squeal till the jeep is warmed up. Its coming from the idle pully but that is brand new too.
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Old 12-01-2010, 12:34 PM   #14
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Check out harmonic balancer if it's ok. Mine went bad not a whole lot about 1/16" or less and it started making squeaking noise. I thought it was an alternator bearing, pump, idler, you name it. At the end of the day check out your belt for excessive wear or glossy spots, that'd be a sign.

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