88 comanche 4.0 belt screech - JeepForum.com
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Unread 08-11-2013, 09:05 PM   #1
sbwell1020
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Join Date: Aug 2013
Location: san luis obispo, CA
Posts: 3
88 comanche 4.0 belt screech

Sounds like a bearing screech the mechanic said it was my a/c eliminator bearing and the water pump bearing so I replaced that pulley and the water pump. Still have the same screech but when I put oil on the belt it goes away for a minute. Could it be a bearing if it goes away when I put oil on the belt?

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Unread 08-11-2013, 09:13 PM   #2
sbwell1020
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Sounds like it is coming from the new water pump bearing. Could I have wrecked the bearing so quick by over tightening the belt?
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Unread 08-27-2013, 11:50 AM   #3
TrucksBootsNGun
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1988 MJ Comanche 
 
Join Date: Aug 2013
Location: Flagstaff, ARIZONA
Posts: 46
I also have a '88 Comanche 4.0L and when I first bought it did was doing the same thing. Guy told me he thought it was the water pump but he had just replaced the idler and belt. I also noticed that it went away when you hit the belt with grease or even water. So I left it and drove it. The noise disappeared about a week or week and a half later (about 1000 miles). That was at 185,XXX. I'm now at 190,XXX and I just switched my truck over to a open radiator design like the '92 and later Cherokees had. In doing so I replaced the water pump while I was at it. Now the squeal is back. I think that it is due to the belt just re-breaking in because if I splash some water on the belt it disappears. Plus after a 3 days of driving and 500 miles later the squeal is noticeably quieter but still present. I know its annoying but I'd say based on my experience just drive it.
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Unread 08-30-2013, 11:51 AM   #4
TrucksBootsNGun
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1988 MJ Comanche 
 
Join Date: Aug 2013
Location: Flagstaff, ARIZONA
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Just thought you might like an update, my squeal stopped somewhere between 562 and 575 miles after the messing with the engine. Hope yours stops soon as well
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