Re: Help with strange scraping sound
 

Our 4.0 did something like that when the drivers side engine mount
tore. It let the engine swing just enough under torque so the exhaust
hits the front driveshaft pinion.

It was a really hard one to find until one day I saw shiny metal down
there....

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)

nrs wrote:
>
> Happy New Year to everyone!
>
> Well, the noise still hasn´t gone away (seems it wasn't the engine
> mount nor the u-joint). It sounds like a slow metalic scraping
> seeming to come from around the bellhousing area. It happens only when
> using engine compresion to control speed when going downhill. I've
> hear it now in 1st, 2nd, and 3rd gears at various times and speeds. I
> can make the sound stop by giving is a bit of gas or by pushing in the
> clutch pedal. The strange thing is that it does not seem to affect
> anything else, Jeep shifts ok, clutch operates smoothly, etc. Any more
> ideas? Any tests I can do?
>
> Thanks

Re: Help with strange scraping sound
 

Our 4.0 did something like that when the drivers side engine mount
tore. It let the engine swing just enough under torque so the exhaust
hits the front driveshaft pinion.

It was a really hard one to find until one day I saw shiny metal down
there....

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)

nrs wrote:
>
> Happy New Year to everyone!
>
> Well, the noise still hasn´t gone away (seems it wasn't the engine
> mount nor the u-joint). It sounds like a slow metalic scraping
> seeming to come from around the bellhousing area. It happens only when
> using engine compresion to control speed when going downhill. I've
> hear it now in 1st, 2nd, and 3rd gears at various times and speeds. I
> can make the sound stop by giving is a bit of gas or by pushing in the
> clutch pedal. The strange thing is that it does not seem to affect
> anything else, Jeep shifts ok, clutch operates smoothly, etc. Any more
> ideas? Any tests I can do?
>
> Thanks

Re: Help with strange scraping sound
 

Our 4.0 did something like that when the drivers side engine mount
tore. It let the engine swing just enough under torque so the exhaust
hits the front driveshaft pinion.

It was a really hard one to find until one day I saw shiny metal down
there....

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)

nrs wrote:
>
> Happy New Year to everyone!
>
> Well, the noise still hasn´t gone away (seems it wasn't the engine
> mount nor the u-joint). It sounds like a slow metalic scraping
> seeming to come from around the bellhousing area. It happens only when
> using engine compresion to control speed when going downhill. I've
> hear it now in 1st, 2nd, and 3rd gears at various times and speeds. I
> can make the sound stop by giving is a bit of gas or by pushing in the
> clutch pedal. The strange thing is that it does not seem to affect
> anything else, Jeep shifts ok, clutch operates smoothly, etc. Any more
> ideas? Any tests I can do?
>
> Thanks

Re: Help with strange scraping sound
 

Mike,

I replaced the driver's side engine mount and have checked for signs of
contact on the exhaust but can´t find any. It really seems to be
something in the bellhousing but don't know enough about these things
to visualize what could be happening.

Thanks


Mike Romain wrote:
> Our 4.0 did something like that when the drivers side engine mount
> tore. It let the engine swing just enough under torque so the exhaust
> hits the front driveshaft pinion.
>
> It was a really hard one to find until one day I saw shiny metal down
> there....
>
> 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)
>
> nrs wrote:
> >
> > Happy New Year to everyone!
> >
> > Well, the noise still hasn´t gone away (seems it wasn't the engine
> > mount nor the u-joint). It sounds like a slow metalic scraping
> > seeming to come from around the bellhousing area. It happens only when
> > using engine compresion to control speed when going downhill. I've
> > hear it now in 1st, 2nd, and 3rd gears at various times and speeds. I
> > can make the sound stop by giving is a bit of gas or by pushing in the
> > clutch pedal. The strange thing is that it does not seem to affect
> > anything else, Jeep shifts ok, clutch operates smoothly, etc. Any more
> > ideas? Any tests I can do?
> >
> > Thanks

Re: Help with strange scraping sound
 

Mike,

I replaced the driver's side engine mount and have checked for signs of
contact on the exhaust but can´t find any. It really seems to be
something in the bellhousing but don't know enough about these things
to visualize what could be happening.

Thanks


Mike Romain wrote:
> Our 4.0 did something like that when the drivers side engine mount
> tore. It let the engine swing just enough under torque so the exhaust
> hits the front driveshaft pinion.
>
> It was a really hard one to find until one day I saw shiny metal down
> there....
>
> 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)
>
> nrs wrote:
> >
> > Happy New Year to everyone!
> >
> > Well, the noise still hasn´t gone away (seems it wasn't the engine
> > mount nor the u-joint). It sounds like a slow metalic scraping
> > seeming to come from around the bellhousing area. It happens only when
> > using engine compresion to control speed when going downhill. I've
> > hear it now in 1st, 2nd, and 3rd gears at various times and speeds. I
> > can make the sound stop by giving is a bit of gas or by pushing in the
> > clutch pedal. The strange thing is that it does not seem to affect
> > anything else, Jeep shifts ok, clutch operates smoothly, etc. Any more
> > ideas? Any tests I can do?
> >
> > Thanks

Re: Help with strange scraping sound
 

Mike,

I replaced the driver's side engine mount and have checked for signs of
contact on the exhaust but can´t find any. It really seems to be
something in the bellhousing but don't know enough about these things
to visualize what could be happening.

Thanks


Mike Romain wrote:
> Our 4.0 did something like that when the drivers side engine mount
> tore. It let the engine swing just enough under torque so the exhaust
> hits the front driveshaft pinion.
>
> It was a really hard one to find until one day I saw shiny metal down
> there....
>
> 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)
>
> nrs wrote:
> >
> > Happy New Year to everyone!
> >
> > Well, the noise still hasn´t gone away (seems it wasn't the engine
> > mount nor the u-joint). It sounds like a slow metalic scraping
> > seeming to come from around the bellhousing area. It happens only when
> > using engine compresion to control speed when going downhill. I've
> > hear it now in 1st, 2nd, and 3rd gears at various times and speeds. I
> > can make the sound stop by giving is a bit of gas or by pushing in the
> > clutch pedal. The strange thing is that it does not seem to affect
> > anything else, Jeep shifts ok, clutch operates smoothly, etc. Any more
> > ideas? Any tests I can do?
> >
> > Thanks

Re: Help with strange scraping sound
 

Clutch release bearing?

Merrill

nrs wrote:
> Mike,
>
> I replaced the driver's side engine mount and have checked for signs of
> contact on the exhaust but can´t find any. It really seems to be
> something in the bellhousing but don't know enough about these things
> to visualize what could be happening.
>
> Thanks
>
>
> Mike Romain wrote:
> > Our 4.0 did something like that when the drivers side engine mount
> > tore. It let the engine swing just enough under torque so the exhaust
> > hits the front driveshaft pinion.
> >
> > It was a really hard one to find until one day I saw shiny metal down
> > there....
> >
> > 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)
> >
> > nrs wrote:
> > >
> > > Happy New Year to everyone!
> > >
> > > Well, the noise still hasn´t gone away (seems it wasn't the engine
> > > mount nor the u-joint). It sounds like a slow metalic scraping
> > > seeming to come from around the bellhousing area. It happens only when
> > > using engine compresion to control speed when going downhill. I've
> > > hear it now in 1st, 2nd, and 3rd gears at various times and speeds. I
> > > can make the sound stop by giving is a bit of gas or by pushing in the
> > > clutch pedal. The strange thing is that it does not seem to affect
> > > anything else, Jeep shifts ok, clutch operates smoothly, etc. Any more
> > > ideas? Any tests I can do?
> > >
> > > Thanks

Re: Help with strange scraping sound
 

Clutch release bearing?

Merrill

nrs wrote:
> Mike,
>
> I replaced the driver's side engine mount and have checked for signs of
> contact on the exhaust but can´t find any. It really seems to be
> something in the bellhousing but don't know enough about these things
> to visualize what could be happening.
>
> Thanks
>
>
> Mike Romain wrote:
> > Our 4.0 did something like that when the drivers side engine mount
> > tore. It let the engine swing just enough under torque so the exhaust
> > hits the front driveshaft pinion.
> >
> > It was a really hard one to find until one day I saw shiny metal down
> > there....
> >
> > 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)
> >
> > nrs wrote:
> > >
> > > Happy New Year to everyone!
> > >
> > > Well, the noise still hasn´t gone away (seems it wasn't the engine
> > > mount nor the u-joint). It sounds like a slow metalic scraping
> > > seeming to come from around the bellhousing area. It happens only when
> > > using engine compresion to control speed when going downhill. I've
> > > hear it now in 1st, 2nd, and 3rd gears at various times and speeds. I
> > > can make the sound stop by giving is a bit of gas or by pushing in the
> > > clutch pedal. The strange thing is that it does not seem to affect
> > > anything else, Jeep shifts ok, clutch operates smoothly, etc. Any more
> > > ideas? Any tests I can do?
> > >
> > > Thanks

Re: Help with strange scraping sound
 

Clutch release bearing?

Merrill

nrs wrote:
> Mike,
>
> I replaced the driver's side engine mount and have checked for signs of
> contact on the exhaust but can´t find any. It really seems to be
> something in the bellhousing but don't know enough about these things
> to visualize what could be happening.
>
> Thanks
>
>
> Mike Romain wrote:
> > Our 4.0 did something like that when the drivers side engine mount
> > tore. It let the engine swing just enough under torque so the exhaust
> > hits the front driveshaft pinion.
> >
> > It was a really hard one to find until one day I saw shiny metal down
> > there....
> >
> > 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)
> >
> > nrs wrote:
> > >
> > > Happy New Year to everyone!
> > >
> > > Well, the noise still hasn´t gone away (seems it wasn't the engine
> > > mount nor the u-joint). It sounds like a slow metalic scraping
> > > seeming to come from around the bellhousing area. It happens only when
> > > using engine compresion to control speed when going downhill. I've
> > > hear it now in 1st, 2nd, and 3rd gears at various times and speeds. I
> > > can make the sound stop by giving is a bit of gas or by pushing in the
> > > clutch pedal. The strange thing is that it does not seem to affect
> > > anything else, Jeep shifts ok, clutch operates smoothly, etc. Any more
> > > ideas? Any tests I can do?
> > >
> > > Thanks

Re: Help with strange scraping sound
 

nrs wrote:
> Mike,
>
> I replaced the driver's side engine mount and have checked for signs
> of contact on the exhaust but can´t find any. It really seems to be
> something in the bellhousing but don't know enough about these things
> to visualize what could be happening.

FWIW: All mounts should be done at the same time or the engine and
transmission will not sit properly.

The only time I had a grind/scrape under load it was due to a
failed rear mains bearing. You can tell if the harmonic balancer
can be moved back and forward by more than 1/8" Mine moved almost 1/2"

Sorry to say, if that is the problem, the fix is a shortblock.

--
DougW