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Car Forum / Driving, Maintenance, Tuning / General Car Topics / March 2007Jeep 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 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/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > 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 [quoted text clipped - 10 lines] > pic of the belt: > http://home.nctv.com/ajns/FANBELT.JPG Dead on - as usual - Mike. Looks exactly like mine did with a bad harmonic balancer. > That usually indicates the harmonic balancer has failed and has started > to walk off the pulley. The balancer is down on the crank pulley. [quoted text clipped - 20 lines] >> pic of the belt: >> http://home.nctv.com/ajns/FANBELT.JPG  SignatureWill Honea <whonea@yahoo.com> 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. >That usually indicates the harmonic balancer has failed and has started >to walk off the pulley. The balancer is down on the crank pulley. [quoted text clipped - 5 lines] >Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 >(More Off Road album links at bottom of the view page) 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 > Are there any factory alignment marks a person might use as a > reference to indicate any slippage? Just wondering how one might rule [quoted text clipped - 9 lines] >> Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 >> (More Off Road album links at bottom of the view page) 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)? >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 [quoted text clipped - 11 lines] > >Mike 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 > Interesting comments - thanks. I'm somewhat familiar with GMs where > you loosen the distributor to tweak timing while having the timing [quoted text clipped - 18 lines] >> >> Mike 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 > 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 [quoted text clipped - 10 lines] > pic of the belt: > http://home.nctv.com/ajns/FANBELT.JPG 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. >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 |
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