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Unread 10-12-2013, 07:01 AM   #1
97ZJ_FOORx4
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serpentine belt deflection

I just replaced my alternator, made sure it was straight with the other pulleys and put my belt back on, now it squeaks when I start it and runs. I was wondering what the belt deflection should be on a 4.0 engine or what could be making it squeak. I also replaced both idler pulleys and still can't pinpoint the squeak.

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Unread 10-12-2013, 07:14 AM   #2
V65Ozzie
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Did you replace the belt? An older belt can make quite a racket. I know on my 97 I had to replace the serpentine belt about once a year, the dirt and mud would get ingrained into the surface, my 98 has just started squeeking now, I tightened it slightly and that helped.
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Unread 10-12-2013, 07:17 AM   #3
97ZJ_FOORx4
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I did not replace the belt because it didn't look bad, plus it's only like 3 months old.
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Unread 10-12-2013, 07:54 AM   #4
97ZJ_FOORx4
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I just took the belt off and replaced it with an old one I had that was in better condition than what I had....no more squeaks so far.
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Unread 10-12-2013, 08:37 AM   #5
SDHarleydad
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I put a new belt on a couple months ago as regular service. It was a $20 belt from o reillys. I too changed out my alt, waterpump, and pulleys. Two weeks ago the ZJ started squealing like a stuck pig. Turns out its the cheap belt from mexico. A real problem with Chrysler engines. An upgraded $40 NAPA belt... all smooth and quiet
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Unread 10-12-2013, 02:30 PM   #6
cootertwo
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Yup, I put a cheepee belt on my 97, and it has to be as tight as a guitar string, to stop the squeeling. Next time I'll spend some more $$$ on a good belt.
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Unread 10-12-2013, 06:08 PM   #7
Oldfrog
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I learned the hard way about cheap belts. Now it's a Gates belt or no belt at all. Dont EVEN TRY to use a freakin' Dayco belt. They suck. I carry a brand new spare Gates in my spare tire cover now.
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Unread 10-12-2013, 06:22 PM   #8
stageninja
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I had a Quality NAPA belt that squealed & replaced it w/a Gatorback. Now that's a belt.
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Unread 10-12-2013, 10:12 PM   #9
Oldfrog
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Mine ate the gatorback up in a month for some reason. Went to Gates and havent looked back since. But others have had good luck with the Gatorback. Maybe I tighten mine too tight..who knows?
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Unread 10-12-2013, 11:53 PM   #10
jbsj33p
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You could also check the condition of your harmonic balancer if it comes back, look at the rubber ring between the two parts of the balancer and see if its cracked or missing pieces. When my balancer was going out it would chirp non stop.
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Unread 10-13-2013, 05:04 AM   #11
coralman
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Makes for good reading. The smart phone app for reading belts is kinda cool too, if I wasnot so old and cranky I might get one of those new fangled phones one day

http://www.gatesprograms.com/beltwear/beltwear
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Unread 10-13-2013, 10:08 AM   #12
zjosh93
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I tighten the belt until I get about 1/2" deflection on the longest span or if you can twist the belt 90 degrees over the same span.

I have a Gates belt on my 4.0 with never any squeaks. If you give the belt a good scrubbing with a fine wire brush (and a pick to scrape out the grooves) and hot soapy water all over it really helps with squeaking. Also clean all the pulleys including using a pick to scrape all the grooves clean.

If you run the belt too tight you'll shorten the life of the bearings in your alternator, power steering pump, idler pulleys, water pump, etc.
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Unread 10-13-2013, 10:34 AM   #13
SDHarleydad
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The NAPA Micro-V is made by GATES
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