post #1 of Old 09-12-2013, 09:21 PM Thread Starter
TrucksBootsNGun
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1988 MJ Comanche 
 
Join Date: Aug 2013
Location: Flagstaff
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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post #2 of Old 09-13-2013, 03:48 PM
carnuck
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1984 J-Series Truck 
 
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Check the "bend" (aka deflection) when you push down between the 2 furthest points.

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post #3 of Old 10-22-2013, 08:14 AM
CmpleteCherokee
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1984 XJ Cherokee 
 
Join Date: Aug 2013
Location: acworth
Posts: 31
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

ryan@completecherokee.com
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post #4 of Old 10-23-2013, 05:21 PM
dkroll
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1988 MJ Comanche 
 
Join Date: May 2008
Location: Independence
Posts: 193
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!

Doug
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post #5 of Old 10-24-2013, 06:17 AM
zackcj7
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1997 TJ Wrangler 
 
Join Date: Apr 2011
Location: Atlanta
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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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post #6 of Old 10-27-2013, 06:41 PM
87MJTim
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1987 MJ Comanche 
 
Join Date: Dec 2012
Location: New Market
Posts: 289
Quote:
Originally Posted by zackcj7 View Post
I second this. Very common problem on the MJs.
+3

Ask me how I know.

Tim

87 Comanche, 4.0, AX15 (formerly BA10/5), D44
84 CJ7, 4.2, AX15 (Formerly T5)
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post #7 of Old 10-28-2013, 12:29 PM Thread Starter
TrucksBootsNGun
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1988 MJ Comanche 
 
Join Date: Aug 2013
Location: Flagstaff
Posts: 46
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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post #8 of Old 10-29-2013, 05:34 AM
dkroll
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1988 MJ Comanche 
 
Join Date: May 2008
Location: Independence
Posts: 193
I have also sprayed belt dressing on the belt, it helps also.

Doug
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