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Unread 09-12-2013, 09:21 PM   #1
TrucksBootsNGun
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1988 MJ Comanche 
 
Join Date: Aug 2013
Location: Flagstaff, ARIZONA
Posts: 46
Another belt Squeal

Well I was tired of the belt squealing so i tightened and it split. got a new belt and put it on and the truck started squealing even worse. I had a spare idler laying around so I put it on because that seems to be the source of the noise and the truck just sits there and idles really nicely but as soon as you go above 1000 RPMs the squeal is there. I've adjusted the belt several times to no luck I even pulled off the idler and stuck some tranny/axle oil in it (no grease on hand) and that didn't really help. Anyone got any ideas?

On a side note any good tricks for knowing when the belt it too tight or too loose? After that belt split I'm just paranoid now.

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Unread 09-13-2013, 03:48 PM   #2
carnuck
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Check the "bend" (aka deflection) when you push down between the 2 furthest points.
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Unread 10-22-2013, 08:14 AM   #3
CmpleteCherokee
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depending on how old your belts were, they could have left material on the pulleys or even glazed them a bit. May be worth checking that as well
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Unread 10-23-2013, 05:21 PM   #4
dkroll
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1989 MJ Comanche 
 
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Check to see if your harmonic balancer is okay also. If you have rubber sticking out of the front of it, you may want to see about replacing it. I have had belt travel enough to eat into my timing chain casing because of this. Can't be good on the belt either!
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Unread 10-24-2013, 06:17 AM   #5
zackcj7
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Quote:
Originally Posted by dkroll View Post
Check to see if your harmonic balancer is okay also. If you have rubber sticking out of the front of it, you may want to see about replacing it. I have had belt travel enough to eat into my timing chain casing because of this. Can't be good on the belt either!
I second this. Very common problem on the MJs.
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Unread 10-27-2013, 06:41 PM   #6
87MJTim
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Quote:
Originally Posted by zackcj7 View Post
I second this. Very common problem on the MJs.
+3

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Unread 10-28-2013, 12:29 PM   #7
TrucksBootsNGun
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1988 MJ Comanche 
 
Join Date: Aug 2013
Location: Flagstaff, ARIZONA
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Update: so i have found that this design is a PITA to work on because if its a little too tight: squeal. Little too loose: squeal. Problem I'm having now is i can only get 3 tries or so before the belt warms up and stretches and no longer squeals. Since it goes away like 5-7 mins after starting the truck I am happy.
Thanks for all the help guys.
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Unread 10-29-2013, 05:34 AM   #8
dkroll
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I have also sprayed belt dressing on the belt, it helps also.
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