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#1
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Jeep Serpinteen Belt
I've posted a pic of a serpentine belt we removed after only being on
a week from a '92 Jeep. Not sure if it's a case of just super old material (on the store rack for 2 years) or what that caused it to fray and break. Couldn't find any obvious problem with bearings or pulleys as a possible cause and also wasn't sure if the last one was too tight when it went on so, how tight should a serpentine belt be when it's installed and is there any immediate tighening schedule generally recommended due to belt stretch? Any replies are greatly appreciated. TIA pic of the belt: http://home.nctv.com/ajns/FANBELT.JPG |
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#2
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Jeep Serpinteen Belt
That usually indicates the harmonic balancer has failed and has started
to walk off the pulley. The balancer is down on the crank pulley. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) cover wrote: > I've posted a pic of a serpentine belt we removed after only being on > a week from a '92 Jeep. Not sure if it's a case of just super old > material (on the store rack for 2 years) or what that caused it to > fray and break. Couldn't find any obvious problem with bearings or > pulleys as a possible cause and also wasn't sure if the last one was > too tight when it went on so, how tight should a serpentine belt be > when it's installed and is there any immediate tighening schedule > generally recommended due to belt stretch? Any replies are greatly > appreciated. > > TIA > > pic of the belt: > http://home.nctv.com/ajns/FANBELT.JPG > > |
#3
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Jeep Serpinteen Belt
Dead on - as usual - Mike. Looks exactly like mine did with a bad
harmonic balancer. On Mon, 12 Mar 2007 10:28:12 -0400, Mike Romain wrote: > That usually indicates the harmonic balancer has failed and has started > to walk off the pulley. The balancer is down on the crank pulley. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > Canadian Off Road Trips Photos: Non members can still view! > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 > (More Off Road album links at bottom of the view page) > > cover wrote: >> I've posted a pic of a serpentine belt we removed after only being on >> a week from a '92 Jeep. Not sure if it's a case of just super old >> material (on the store rack for 2 years) or what that caused it to >> fray and break. Couldn't find any obvious problem with bearings or >> pulleys as a possible cause and also wasn't sure if the last one was >> too tight when it went on so, how tight should a serpentine belt be >> when it's installed and is there any immediate tighening schedule >> generally recommended due to belt stretch? Any replies are greatly >> appreciated. >> >> TIA >> >> pic of the belt: >> http://home.nctv.com/ajns/FANBELT.JPG >> >> -- Will Honea > |
#4
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Jeep Serpinteen Belt
This also happens if your belt is not in the groves correctly on one of the
pulleys. Check all belt alignments with the various pullyes. old john "cover" > wrote in message ... > I've posted a pic of a serpentine belt we removed after only being on > a week from a '92 Jeep. Not sure if it's a case of just super old > material (on the store rack for 2 years) or what that caused it to > fray and break. Couldn't find any obvious problem with bearings or > pulleys as a possible cause and also wasn't sure if the last one was > too tight when it went on so, how tight should a serpentine belt be > when it's installed and is there any immediate tighening schedule > generally recommended due to belt stretch? Any replies are greatly > appreciated. > > TIA > > pic of the belt: > http://home.nctv.com/ajns/FANBELT.JPG > > |
#5
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Jeep Serpinteen Belt
That's interesting - another poster commented on that. The belt in
question was supposed to be the 'premium' brand and had a cross-cut pattern to it versus that typical 'powerband' look with grooves matching the pulleys. On Mon, 12 Mar 2007 23:30:46 -0700, > wrote: >This also happens if your belt is not in the groves correctly on one of the >pulleys. >Check all belt alignments with the various pullyes. >old john > |
#6
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Jeep Serpinteen Belt
Are there any factory alignment marks a person might use as a
reference to indicate any slippage? Just wondering how one might rule in or rule out something like the harmonic balancer. On Mon, 12 Mar 2007 10:28:12 -0400, Mike Romain > wrote: >That usually indicates the harmonic balancer has failed and has started >to walk off the pulley. The balancer is down on the crank pulley. > >Mike >86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 >88 Cherokee 235 BFG AT's >Canadian Off Road Trips Photos: Non members can still view! >Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 >(More Off Road album links at bottom of the view page) |
#7
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Jeep Serpinteen Belt
When the balancer fails, it usually fails slightly crooked before it
spins off so you can see a wobble in it. If you put the belt on and eyeball it from the side view, the belt should look slightly skewed. If you come at it from the bottom view, you should be able to see bits of rubber or a rubber band in the center of the balancer coming out. Sometimes they also slip the timing mark so if you put a timing light on it, the mark on the balancer won't be in the right place. The timing is not adjustable via the distributor, so if the mark is off, it is the balancer. It is not an unusual failure... Mike cover wrote: > Are there any factory alignment marks a person might use as a > reference to indicate any slippage? Just wondering how one might rule > in or rule out something like the harmonic balancer. > > On Mon, 12 Mar 2007 10:28:12 -0400, Mike Romain > > wrote: > >> That usually indicates the harmonic balancer has failed and has started >> to walk off the pulley. The balancer is down on the crank pulley. >> >> Mike >> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 >> 88 Cherokee 235 BFG AT's >> Canadian Off Road Trips Photos: Non members can still view! >> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 >> (More Off Road album links at bottom of the view page) > |
#8
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Jeep Serpinteen Belt
Interesting comments - thanks. I'm somewhat familiar with GMs where
you loosen the distributor to tweak timing while having the timing light on the damper but that isn't how jeep does it huh? How Do you adjust timing on a jeep if you had to and if the damper slips, do you normally notice any difference in performance (as if the timing slipped)? On Tue, 13 Mar 2007 10:29:37 -0400, Mike Romain > wrote: >When the balancer fails, it usually fails slightly crooked before it >spins off so you can see a wobble in it. If you put the belt on and >eyeball it from the side view, the belt should look slightly skewed. > >If you come at it from the bottom view, you should be able to see bits >of rubber or a rubber band in the center of the balancer coming out. > >Sometimes they also slip the timing mark so if you put a timing light on >it, the mark on the balancer won't be in the right place. The timing is >not adjustable via the distributor, so if the mark is off, it is the >balancer. > >It is not an unusual failure... > >Mike > |
#9
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Jeep Serpinteen Belt
There is no timing adjustment on the Jeep 4.0 engine other than setting
the rotor pointing 'just' past #1 post on the cap at compression stroke TDC. The computer adjusts things from there. The distributor itself only fits in one way, it has a fitting notch on it. This means if the timing mark is off, either the balancer has slipped or the timing chain has jumped which is almost unheard of on those engines. The last chain I saw had 200K on it or so and a new timing chain and gears had exactly the same 'slop' in degrees that the original did which means minimal wear. Mike cover wrote: > Interesting comments - thanks. I'm somewhat familiar with GMs where > you loosen the distributor to tweak timing while having the timing > light on the damper but that isn't how jeep does it huh? How Do you > adjust timing on a jeep if you had to and if the damper slips, do you > normally notice any difference in performance (as if the timing > slipped)? > > On Tue, 13 Mar 2007 10:29:37 -0400, Mike Romain > > wrote: > >> When the balancer fails, it usually fails slightly crooked before it >> spins off so you can see a wobble in it. If you put the belt on and >> eyeball it from the side view, the belt should look slightly skewed. >> >> If you come at it from the bottom view, you should be able to see bits >> of rubber or a rubber band in the center of the balancer coming out. >> >> Sometimes they also slip the timing mark so if you put a timing light on >> it, the mark on the balancer won't be in the right place. The timing is >> not adjustable via the distributor, so if the mark is off, it is the >> balancer. >> >> It is not an unusual failure... >> >> Mike >> > |
#10
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Jeep Serpinteen Belt
On Mon, 12 Mar 2007 08:10:59 -0500, "eddlover2004"
> wrote: >HI JEEP AND CHRYLER HAD A PROBLEM WITH THERE BELTS THE HAVE A SPECIAL GROVE >IN THEM THAT KEEP THAT BEARING SOUND FROM HAPPEN SO MAKE SURE U GET THE >BELT WITH A SLANTED GROVE IN THEM. As it turns out, I'm pretty sure this was the problem. The 'premium' Goodyear belt had a strange pattern to it that did not bode well with the existing grooves in the pulleys. We purchased the lesser expensive model belt which DID have a very pronounced groove track that would match those on the jeep and haven't had any problems at all. keeping our fingers crossed but believe now, that's what the issue was. Thanks again to all who replied. |
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