How long did your serpentine belt last? - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 20 Old 03-29-2011, 11:26 PM Thread Starter
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How long did your serpentine belt last?

I have almost 50K. I have almost always replaced my belts every 30K or so, but I have also never had a domestic automobile before, and never had anything brand new before either, except motorcycles.

Anyone have a JK belt fail? How many miles?

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140K pretty much trouble free miles despite the constant abuse.
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post #2 of 20 Old 03-30-2011, 12:16 AM
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I'd say around 20k-30k. but mostly due to the PSC power steering pump. it was mis-aligned. When it went the 2nd time I was in Daytona last year for Jeep Beach. The dealer took care of it and installed a small spacer to line everything up.


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post #3 of 20 Old 03-30-2011, 03:00 AM
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Dont think it says anything about belt replacement in my manual. Id change it reguardless after 5yr/60k

Give it a check over every 6 months or so. Check for cracks, nothing like being stranded or overheated over a 25$ belt
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post #4 of 20 Old 03-30-2011, 03:28 AM
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Just replaced it at 60
It's not toast but the psc pump is pretty hard on it
Always a good idea to carry a spare

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post #5 of 20 Old 03-30-2011, 04:16 AM
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51k so far , still looks good.
my wifes car has 95k on the orginal belt and orginal batt to, guess when you dont wheel stuff it last longer?

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post #6 of 20 Old 03-30-2011, 04:33 AM
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I'd agree with most everybody else. I replace my belts at 50K and keep them as spares. Maybe overkill but who wants to break down cause of a belt or a hose?

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post #7 of 20 Old 03-30-2011, 06:52 AM
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I was forced to replace mine at about 60,000 because my idler pully failed. I was on my way home from the Crawl for a Cure at RC when the pully failed.
It was after 5pm and there where no parts places open near where we were on Rte 78.
I now carry two spare idler pullies (one for the idler and one for the tensioner) and a spare belt.

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post #8 of 20 Old 03-30-2011, 06:59 AM
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I'd agree with most everybody else. I replace my belts at 50K and keep them as spares. Maybe overkill but who wants to break down cause of a belt or a hose?
very good point and the spare won't take up much space either.

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post #9 of 20 Old 03-30-2011, 07:05 AM
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Lost my stock one right after PSC pump install. then got everything somewhat aligned. I have thrown a couple of belts driving in extremely wet/muddy conditions. I carry 2 spare belts.
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post #10 of 20 Old 03-30-2011, 07:54 AM
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96k still on the same belt.
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post #11 of 20 Old 03-30-2011, 08:33 AM
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60k stock belt. I need to replace my idler pulley though and probably will do the belt at the same time.

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post #12 of 20 Old 03-30-2011, 08:59 AM
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my tensioner pulley was going (bearings worn) and cause my belt to wear prematurely, the dealer came good on the pulley but not the belt, I later found out from another class A mechanic that I coulda forced them to replace the belt too as it was the pulley that caused it to wear, but it wasnt that much for the belt

just a bit of info for you guys to be armed with if you go this route

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post #13 of 20 Old 03-30-2011, 09:12 AM
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mine was looking cracked up..around 22 k but i have a supercharger.. not sure if that made a difference ..
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post #14 of 20 Old 03-30-2011, 09:12 AM Thread Starter
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Mine looks pretty good for 50,000, but I don't trust it and will buy a new one since I am giving the Jeep a 50K service. I don't like to keep old belts as spares. Once they have been used and heat cycled they will deteriorate very quickly even just sitting. If I need to take a spare, I will just buy one to take.

2008 JKU Rubicon
TerraFlex 4" coils
Fox 2.0's
Smitty SRC Bumper
Smitty XRC Winch
Hella Rally 4000's
Hella H4 Headlight conversion
K&N CAI
Diablo In Tune
Ripp Headers
American Racing Mojave 17x8
Cooper AT3 315/70/17

140K pretty much trouble free miles despite the constant abuse.
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post #15 of 20 Old 03-30-2011, 04:27 PM
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Here's mine that left the Jeep around Johnstown, PA on a Friday afternoon heading home 4 hours away. I was around 24K.
When I got to the local dealership, they had to order one in and the pulley that melted. I would have been there till the next Tuesday waiting on warranty parts. Napa had the belt and a pulley, but since they were not Jeep, I had to install them in their parking lot.

A big thanks went out to Tkob and NJJK08 for the part numbers for Napa.
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post #16 of 20 Old 06-16-2018, 03:34 PM
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I know this is an old thread, but thought I'd add my experience. I have a 2009 4dr Rubicon with 117k on it. I've checked the belt at regular intervals, and it still seems fine. In the owner's manual under maintenance schedules, it shows to replace the serpentine belt at 120,000 miles, so that's when I plan to replace it. Also, the belt manufacturers recommend replacing the tensioner and the idler pulleys at the same time, and after 9+ years and 120k miles, that seems like a good idea to me. I'm pretty impressed with the serpentine belt system durability on my Jeep, and unless you have some sort of problem, I don't think there's a need to change the belt earlier than every 120k.
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post #17 of 20 Old 07-14-2018, 05:00 AM
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Being the overly cautious type I suppose, serp belt replacement is part of the 30k maintenance routine on my '09 JKUR. I carry one of the old ones in my trail spares, along with replacement tensioner and idler. JK now has about 72k on the odo. No worries.

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post #18 of 20 Old 07-14-2018, 11:36 AM
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Mine is 6 yrs old, around 66k and I just replaced the belt about a month ago. Been carrying a new one in the back since about 40k just in case. Old one was still plenty good enough to keep for a trail spare, but with the heat in the central valley of CA, I was getting uncomfortable with it being on there.

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post #19 of 20 Old 07-14-2018, 10:41 PM
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2008 with 70k-ish and a squeaky idler pulley I hit with silicone spray every few months and it’s still good.

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post #20 of 20 Old 07-15-2018, 07:35 AM
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i have an ‘11 Unlimited that I check everything weekly on. It just hit 90k and the serpentine belt looks new+ hasn’t stretched. I have a replacement griptied to firewall behind the battery. I used to zip tie it to sportsbar as it was since first week I bought the jeep. Same on my other Jeeps.

Jeffery’s tip : when giving a belt the once-over ,don’t just check for edge fraying or stretching or nicks/cuts on drivebelts; find one of the pulleys which have the grooves facing outward ( or run your hand along grooves underside of belt while bending it a little) then run fingers across the expanded, taught grooves to feel for gaps or cracks in those grooves strips since they tend to be where belts that have dry cracked or are upward in years are gonna be likely to break.





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