Re: Loud grinding on start-up
 

>>> And since the general consensus is it's not my pilot bearing, I guess I
>>> ASS-UMED right.

>> I see no evidence to indicate that your TO bearing could not be
>> ultimately at fault.

> The pilot bearing 'cannot' be the problem because the noise exists with
> the clutch pedal up which means the pilot bearing is 'not' in use at
> that time.

The pilot bearing and the clutch throwout bearing are two different
things; I was referring to the throwout bearing.

Re: Loud grinding on start-up
 

>>> And since the general consensus is it's not my pilot bearing, I guess I
>>> ASS-UMED right.

>> I see no evidence to indicate that your TO bearing could not be
>> ultimately at fault.

> The pilot bearing 'cannot' be the problem because the noise exists with
> the clutch pedal up which means the pilot bearing is 'not' in use at
> that time.

The pilot bearing and the clutch throwout bearing are two different
things; I was referring to the throwout bearing.

Re: Loud grinding on start-up
 

>>> And since the general consensus is it's not my pilot bearing, I guess I
>>> ASS-UMED right.

>> I see no evidence to indicate that your TO bearing could not be
>> ultimately at fault.

> The pilot bearing 'cannot' be the problem because the noise exists with
> the clutch pedal up which means the pilot bearing is 'not' in use at
> that time.

The pilot bearing and the clutch throwout bearing are two different
things; I was referring to the throwout bearing.

Re: Loud grinding on start-up
 

Outatime wrote:
>
> >>> And since the general consensus is it's not my pilot bearing, I guess I
> >>> ASS-UMED right.
>
> >> I see no evidence to indicate that your TO bearing could not be
> >> ultimately at fault.
>
> > The pilot bearing 'cannot' be the problem because the noise exists with
> > the clutch pedal up which means the pilot bearing is 'not' in use at
> > that time.
>
> The pilot bearing and the clutch throwout bearing are two different
> things; I was referring to the throwout bearing.

The throw out also isn't supposed to be turning when the clutch pedal is
out.

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)

Re: Loud grinding on start-up
 

Outatime wrote:
>
> >>> And since the general consensus is it's not my pilot bearing, I guess I
> >>> ASS-UMED right.
>
> >> I see no evidence to indicate that your TO bearing could not be
> >> ultimately at fault.
>
> > The pilot bearing 'cannot' be the problem because the noise exists with
> > the clutch pedal up which means the pilot bearing is 'not' in use at
> > that time.
>
> The pilot bearing and the clutch throwout bearing are two different
> things; I was referring to the throwout bearing.

The throw out also isn't supposed to be turning when the clutch pedal is
out.

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)

Re: Loud grinding on start-up
 

Outatime wrote:
>
> >>> And since the general consensus is it's not my pilot bearing, I guess I
> >>> ASS-UMED right.
>
> >> I see no evidence to indicate that your TO bearing could not be
> >> ultimately at fault.
>
> > The pilot bearing 'cannot' be the problem because the noise exists with
> > the clutch pedal up which means the pilot bearing is 'not' in use at
> > that time.
>
> The pilot bearing and the clutch throwout bearing are two different
> things; I was referring to the throwout bearing.

The throw out also isn't supposed to be turning when the clutch pedal is
out.

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)

Re: Loud grinding on start-up
 

Mike Romain wrote:

> The throw out also isn't supposed to be turning when the clutch pedal is
> out.

Unless there is a lot of freeplay, it normally does; most self-adjusting
clutch release assemblies keep lateral loads to a minimum while
minimizing freeplay, which usually spins the bearing without a load when
the clutch is fully engaged. Most TO bearing problems I run into in
commercial vehicles make noise regardless of pedal positioning.

The sound that a dry/pitted TO roller bearing makes is very distinct.
We normally lube TO bearings from underneath the bellhousing when clutch
freeplay is adjusted (usu. every 10K miles or so), but most mechanics
are too lazy to bother these days. Their redemption comes in the form
of a complete clutch assembly replacement on a weekend they would
normally have off.

All of the armchair quarterbacking here can't replace disassembly and
inspection, which is what I recommend.

Re: Loud grinding on start-up
 

Mike Romain wrote:

> The throw out also isn't supposed to be turning when the clutch pedal is
> out.

Unless there is a lot of freeplay, it normally does; most self-adjusting
clutch release assemblies keep lateral loads to a minimum while
minimizing freeplay, which usually spins the bearing without a load when
the clutch is fully engaged. Most TO bearing problems I run into in
commercial vehicles make noise regardless of pedal positioning.

The sound that a dry/pitted TO roller bearing makes is very distinct.
We normally lube TO bearings from underneath the bellhousing when clutch
freeplay is adjusted (usu. every 10K miles or so), but most mechanics
are too lazy to bother these days. Their redemption comes in the form
of a complete clutch assembly replacement on a weekend they would
normally have off.

All of the armchair quarterbacking here can't replace disassembly and
inspection, which is what I recommend.

Re: Loud grinding on start-up
 

Mike Romain wrote:

> The throw out also isn't supposed to be turning when the clutch pedal is
> out.

Unless there is a lot of freeplay, it normally does; most self-adjusting
clutch release assemblies keep lateral loads to a minimum while
minimizing freeplay, which usually spins the bearing without a load when
the clutch is fully engaged. Most TO bearing problems I run into in
commercial vehicles make noise regardless of pedal positioning.

The sound that a dry/pitted TO roller bearing makes is very distinct.
We normally lube TO bearings from underneath the bellhousing when clutch
freeplay is adjusted (usu. every 10K miles or so), but most mechanics
are too lazy to bother these days. Their redemption comes in the form
of a complete clutch assembly replacement on a weekend they would
normally have off.

All of the armchair quarterbacking here can't replace disassembly and
inspection, which is what I recommend.

Re: Loud grinding on start-up
 

If you spin the throwout bearing on a Jeep, it will fast burn a hole in
the front bearing cap or seal cover or 'nose' of the cover. It will
then hang and burn all the fingers off the pressure plate.

This was a common problem with the mechanical linkages if they were not
adjusted correctly. If they were too tight or if someone used the
clutch pedal as a foot rest, good bye pressure plate and tranny nose.
(bearing cap) Common enough failure, that the local Jeep shops even
stock new bearing caps...

There is no adjustment on the new hydraulic systems so if he has throw
out bearing noise, his new clutch was incorrectly put together or they
used the wrong parts.

When I hear his symptoms on a new clutch, I think loose pressure plate
bolt or even a loose starter.

I have also seen bad noises happen on start up just before the
transmission falls out of the Jeep because the installer forgot to
torque the bellhousing bolts.

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)

Outatime wrote:
>
> Mike Romain wrote:
>
> > The throw out also isn't supposed to be turning when the clutch pedal is
> > out.
>
> Unless there is a lot of freeplay, it normally does; most self-adjusting
> clutch release assemblies keep lateral loads to a minimum while
> minimizing freeplay, which usually spins the bearing without a load when
> the clutch is fully engaged. Most TO bearing problems I run into in
> commercial vehicles make noise regardless of pedal positioning.
>
> The sound that a dry/pitted TO roller bearing makes is very distinct.
> We normally lube TO bearings from underneath the bellhousing when clutch
> freeplay is adjusted (usu. every 10K miles or so), but most mechanics
> are too lazy to bother these days. Their redemption comes in the form
> of a complete clutch assembly replacement on a weekend they would
> normally have off.
>
> All of the armchair quarterbacking here can't replace disassembly and
> inspection, which is what I recommend.