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04-09-2008, 09:01 PM
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#1
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Registered User
Join Date: Apr 2008
Location: Colorado
Posts: 27
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Whats the tension on a new serpentine belt suppose to be?
I heard 180lbs-200lbs but I wanted another opinion.
Thanks
Sean
93,cherokee,6cyl,4.0L
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04-09-2008, 09:05 PM
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#2
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Registered User
Join Date: Jul 2007
Location: San Jose
Posts: 1,624
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Super-duper tight. If it squeals then it is too loose.
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04-09-2008, 09:10 PM
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#3
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Registered User
Join Date: Apr 2008
Location: Colorado
Posts: 27
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Yeah I kinda figured that. Im was going to use a gauge to ensure I do not damage anything. I heard 180-200lbs, 1/2" deflection. Never replaced this before, dont want to screw it up. Suggestions?
Thanks
Sean
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04-09-2008, 10:25 PM
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#4
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Registered User
Join Date: Nov 2007
Location: Southern Maryland
Posts: 1,337
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Haynes says 180-200 lbs for a new belt, 140-160 for an old one.
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04-09-2008, 10:33 PM
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#5
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Registered User
Join Date: Apr 2008
Location: Colorado
Posts: 27
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thats weird... I couldnt find it anywhere in my Haynes. Says 1/2" deflection but I couldnt find the lbs.
Thanks for the info!
Sean
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04-09-2008, 11:34 PM
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#6
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Registered User
Join Date: Nov 2007
Location: Southern Maryland
Posts: 1,337
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Probably Chilton then, I don't remember which
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04-09-2008, 11:46 PM
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#7
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Registered User
Join Date: Dec 2007
Location: Grafton, MA
Posts: 219
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i've always gone with the first reply or about 90* twist between 2 pulleys
__________________
98 XJ, perpetually on jackstands
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04-09-2008, 11:51 PM
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#8
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Registered User
Join Date: Aug 2005
Location: Morris County, New Jersey
Posts: 2,217
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The above specs were correct (180-200, etc). A new belt will stretch/loosen over time, so you may want to check it and retighten if necessary.
__________________
North Jersey Jeep Club
Trail Rig: 2000 XJ w/ 4.5" RE SF, Locked XJ D44 Rear, Locked D30, and a bunch of other things
Pavement Pounder: 2001 XJ Daily Driver, 2" BB, 245/70R16 AT's on Moabs
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04-25-2008, 09:05 AM
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#9
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Registered User
Join Date: Feb 2008
Location: Tarpon Springs, Florida
Posts: 16
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I would so recommend the NAPA auto part belt tension gauge. I tightened mine earlier in the week by eyeball and deflection...WOW I was way off. I think my tension was around 80 and it had to be at 180....lol So for those who do it by guesstimate...go buy the $13 tension gauge.
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05-20-2008, 11:51 AM
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#10
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Registered User
Join Date: Jun 2007
Location: Durham, NC (Abq, NM; LA, CA; Kahului, HI), NC
Posts: 49
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I was trying to set my serpentine tension the other day ('93 YJ 2.5L) and found this thread...
Seriously, all you guys who use "deflection" method -- this is way easier. Get the KR-2, it's ridiculously easy to use. As KRUNNCH said, I had it set at tension lower than the gauge would even measure (probably in the 80-90 range). The tension gauge works from 100-200 lbs (and has a scale for corresponding metric measure too if you prefer).
Can someone confirm the tension that I should have on this motor? This thread was started for '93 4.0L, I need specs for a 2.5L. (I set it to 180lbs for now).
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06-30-2008, 07:11 PM
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#11
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Registered User
Join Date: Jan 2008
Location: SE MI USA
Posts: 47
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Quote:
Originally Posted by 00sean00
ensure I do not damage anything.
Sean
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Actually this is the biggest cause of siezed alternators. Tighten it up too tight and you put too much pressureon the bearings... and your power steering pump and a/c compressor also if you got that.
__________________
"Those who can make you believe absurdities can make you commit atrocites." -Voltaire
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07-01-2008, 01:05 PM
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#12
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Registered User
Join Date: Jan 2008
Location: Miami, Florida
Posts: 475
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I also eyeballed it and it fell really tight. I only get the squeal when going through puddles. Will have to tighten up some more... Guess I'll be going to NAPA this week.
Thanks for the headsup....
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07-01-2008, 03:19 PM
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#13
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Registered User
Join Date: Jan 2008
Location: SE MI USA
Posts: 47
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My store charged me $16.88, but whatever... it's cheaper than an alternator!
Part number NBHKR2 at NAPA
__________________
"Those who can make you believe absurdities can make you commit atrocites." -Voltaire
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02-28-2009, 11:36 PM
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#14
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Registered User
Join Date: Feb 2009
Location: Arizona
Posts: 79
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To everyone that responded, thanks a million! After changing it I am a little embarrassed that I was worried about it but it sure was nice knowing that if I had a question I could get an answer. The new belt (Goodyear Gator(back?)) is on and all is good. I guessed at the tension but I doubt that I am too loose. I just hope I didn't over do it. I'll have to stop by Napa. All the pulleys, fan clutch, alternator, etc seem to be in good shape. Again, thanks for the support!. I am going to start a new thread about an issue I am having while shifting but I'll mention it here just in case someone is still reading this and can help. When I shift, it sounds like someone is hitting the bottom of the Jeep with a rubber mallet. I can feel it jerk when it does it as well. I am suspicious of the clutch and the trans mount but I looked at the trans mount and didn't see anything wrong. It was a very quick look though. I am off to start a new thread. Thanks again!
Eric
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04-05-2009, 07:41 AM
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#15
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Registered User
Join Date: Jan 2009
Location: Effort, Pennsylvania
Posts: 233
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Do you measure the belt between the PS and alternator, with or without the tensioner (roller)?
The roller on my non A/C 2.5 4-banger deflects the belt already a little.
I would imagine thatif one took off the roller, with 180 lbs tension, it would not go back on easy, and also would increase the tension.
Comments?
__________________
1992 YJ Project, mainly stock, 2.5, true-track rear, true-track front, w Meyers plow
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Serpentine belt tension?
