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Re: 92 cherokee laredo front end vibration

At that age I would be checking the track bar close. That is a bar that
goes on a diagonal from the passenger side axle up to the drivers side
frame in the front. It wears out in 2 places. The bushings at the axle
and the ball joint at the frame. If you have someone cut the tires side
to side while you watch it, you can see play in the bushings and
movement in the ball joint if either is bad.

Your steering has a shock or stabilizer on it to slow down vibes, it
could be worn out. 'Usually' you can see signs of leaks when worn out.

The rad fan can also make a really strange vibration when it is worn
out. Bad enough I thought I was going to lose a front wheel when ours
went.

If you are in the neighborhood, drop on by Herb, maybe we can spot
something here.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Herb wrote:
>
> 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the speed,
> the higher frequency the vibration is. Get tires balanced,vibration still
> there. I jacked up front end, no joints found to be loose.
>
> Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or the
> hub?
>
> Any advice on how to find out the problem?
>
> thanks
>
>

Re: 92 cherokee laredo front end vibration

I have a 93 Cherokee and I just replaced the track bar mount that was worn,
it was caused by a track bar that was worn and eventually wore the mount.

You may have a slipped belt in a tire as well, we all know Cambodian Tire
doesn't always get the best things.

What part of Canada you in??

Snow

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:41C5902E.15AEBB94@sympatico.ca...
> At that age I would be checking the track bar close. That is a bar that
> goes on a diagonal from the passenger side axle up to the drivers side
> frame in the front. It wears out in 2 places. The bushings at the axle
> and the ball joint at the frame. If you have someone cut the tires side
> to side while you watch it, you can see play in the bushings and
> movement in the ball joint if either is bad.
>
> Your steering has a shock or stabilizer on it to slow down vibes, it
> could be worn out. 'Usually' you can see signs of leaks when worn out.
>
> The rad fan can also make a really strange vibration when it is worn
> out. Bad enough I thought I was going to lose a front wheel when ours
> went.
>
> If you are in the neighborhood, drop on by Herb, maybe we can spot
> something here.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
> >
> > 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the
speed,
> > the higher frequency the vibration is. Get tires balanced,vibration
still
> > there. I jacked up front end, no joints found to be loose.
> >
> > Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or
the
> > hub?
> >
> > Any advice on how to find out the problem?
> >
> > thanks
> >
> >

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Re: 92 cherokee laredo front end vibration

Definitely check out the trac bar ------- as well as the track bar
mount.

This particular suspension (forward 'lead' of control arms) is
'naturally' unstable for vibrations and unless the trac bar, trac mount
and steering damper are 100% correct you will get 'nodes' of
vibration.at various driving speeds. The trac bar (and damper) prevents
these natural oscilations from occurring; the damper is there for
'transient' vibrations caused by 'bumps in the road' etc. the trac bar
there to prevent 'natural frequency oscilation'. The symptoms of
vibrational instability will be found by carefully examining for
adverse wear patterns on the road surface edge of the inside of the
inner tire tread margins.

Check the inside margin of the tires (the inside tread).... lightly rub
your hand along this margin and feel for uneveness and irregular wear
patterns on the surface (only on the 'inside' tread). If you find them
do the following test: Engine off, steering wheel centered - turn
steering wheel 180 degrees back and forth, sight down hood at far
distant object ..... and if the body is 'moving' with respect to a far
distant object when you rotate the steering wheel back and forth then
you probably have something loose in the trac bar or its mounting on
the frame. If the body moves have an assistant rotate the wheel while
you are under the vehicle and look for the sites of looseness on the
trac bar and mount.

For the trac bar *mount* on the frame - ... be *sure* that all the
bolts are fully torqued especially the ones that attach the bottom
flange of the mount to the frame --- then test for movement between the
trac bar itself and the mount. If any of the mounting part are loose,
use RED locktite to reassemble and re-torque. The mount is very
subject to wear (ductile deformation) in the hole that accepts the
pin/spindle of the trac bar .... only a few 'thousands' of 'play' in
the 'hole' of the mount will magnify to a LOT of vibration when the
steering components reach their "natural frequency" of oscilation. If
the bottom flange bolts of the mount are loose, the vibrations when
they occur will be greatly MAGNIFIED.

Check the inner tread on the tires !!!!!!!!!!!!!!!! any 'waviness' of
the (road) surface of the 'inside' tread indicates a loose trac bar /
trac bar mount. The waviness on the inner tread margin is caused by
induced 'natural frequency vibrations' the same thing that makes a
violin string vibrate - the suspension is the violin string, the road
surface is the 'bow'. A dead tight trac bar system will keep this from
happening.

Hope this helps.

In article <41C5902E.15AEBB94@sympatico.ca>, Mike Romain
<romainm@sympatico.ca> wrote:

> At that age I would be checking the track bar close. That is a bar that
> goes on a diagonal from the passenger side axle up to the drivers side
> frame in the front. It wears out in 2 places. The bushings at the axle
> and the ball joint at the frame. If you have someone cut the tires side
> to side while you watch it, you can see play in the bushings and
> movement in the ball joint if either is bad.
>
> Your steering has a shock or stabilizer on it to slow down vibes, it
> could be worn out. 'Usually' you can see signs of leaks when worn out.
>
> The rad fan can also make a really strange vibration when it is worn
> out. Bad enough I thought I was going to lose a front wheel when ours
> went.
>
> If you are in the neighborhood, drop on by Herb, maybe we can spot
> something here.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
> >
> > 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the speed,
> > the higher frequency the vibration is. Get tires balanced,vibration still
> > there. I jacked up front end, no joints found to be loose.
> >
> > Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or the
> > hub?
> >
> > Any advice on how to find out the problem?
> >
> > thanks
> >
> >