A Cars forum. AutoBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AutoBanter forum » Auto newsgroups » Technology
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Jeep Serpinteen Belt



 
 
Thread Tools Display Modes
  #1  
Old March 12th 07, 11:31 AM posted to rec.autos.4x4,rec.autos.tech,alt.autos
cover
external usenet poster
 
Posts: 32
Default 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


Ads
  #2  
Old March 12th 07, 03:28 PM posted to rec.autos.4x4,rec.autos.tech,alt.autos
Mike Romain
external usenet poster
 
Posts: 3,758
Default 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  
Old March 12th 07, 03:37 PM posted to rec.autos.4x4,rec.autos.tech,alt.autos
Will Honea[_1_]
external usenet poster
 
Posts: 552
Default 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  
Old March 13th 07, 07:30 AM posted to rec.autos.4x4,rec.autos.tech,alt.autos
external usenet poster
 
Posts: n/a
Default 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  
Old March 13th 07, 11:57 AM posted to rec.autos.4x4,rec.autos.tech,alt.autos
cover
external usenet poster
 
Posts: 32
Default 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  
Old March 13th 07, 12:00 PM posted to rec.autos.4x4,rec.autos.tech,alt.autos
cover
external usenet poster
 
Posts: 32
Default 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  
Old March 13th 07, 03:29 PM posted to rec.autos.4x4,rec.autos.tech,alt.autos
Mike Romain
external usenet poster
 
Posts: 3,758
Default 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  
Old March 15th 07, 02:35 PM posted to rec.autos.4x4,rec.autos.tech,alt.autos
cover
external usenet poster
 
Posts: 32
Default 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  
Old March 15th 07, 03:32 PM posted to rec.autos.4x4,rec.autos.tech,alt.autos
Mike Romain
external usenet poster
 
Posts: 3,758
Default 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  
Old April 15th 07, 03:49 PM posted to rec.autos.4x4,rec.autos.tech,alt.autos
cover
external usenet poster
 
Posts: 32
Default 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.
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Jeep Serpinteen Belt cover 4x4 10 April 15th 07 03:49 PM
Jeep Cherokee serpentine belt problem tr Jeep 3 August 27th 06 06:19 PM
How do I properly install timing belt, balancer belt on H22A Engine? Please Help [email protected] Honda 7 August 8th 06 07:07 AM
How do I properly install timing belt, balancer belt on H22A Engine? Please Help [email protected] Technology 2 August 5th 06 05:10 AM
how i replaced my porsche 968 water pump, timing belt and balance belt leeroy968 Technology 0 February 25th 06 06:15 AM


All times are GMT +1. The time now is 10:10 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AutoBanter.
The comments are property of their posters.