[DeTomaso] Throwout Bearing for Centerforce Clutch

Asa Jay Laughton asajay at asajay.com
Sun Oct 25 20:06:39 EDT 2009


That wear pattern would indicate the bearing outer diameter was too 
big.  Can you take a photo of your clutch on the engine so we can see 
what you believe the outer edge is interfering with?  Thank you for 
using the POCA gallery to share your photos, it really helps us get a 
look at what your talking about.

Asa Jay

Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1971 Mach I Mustang  [ASA JAY]
1973 Pantera L 5533  [ASASCAT]
    
******************************     
http://www.asajay.com
http://www.teampanteraracing.com
  



Scott Couchman wrote:
> I'm sure this has been discussed before, but I searched the archive and couldn't find it, so bear with me please. I've got my ZF out on the garage floor and the TO bearing out, but I want to make sure I replace it with the correct one, and I'm concerned that I may have another problem that I don't understand.
> As a reminder, I was in Ely last month ready to run the Silver State when my Pantera started to make noises that sounded like a bad throwout bearing. It didn't make any noise when the clutch pedal is
>  out (no load on the bearing) or when the clutch pedal is in all the way (full load on the bearing). It only
> made noise occasionally when the clutch pedal
>  was depressed or released
> as the clutch started to engage. Once engaged, it did not make any noise.
> So, in the normal shifting sequence, no noise when I push the clutch in and
> hold it while the car is stationary, noise starts as I let the clutch out and the
> clutch starts to engage, and finally, no noise when the pedal is out and the
> clutch is engaged and the car is moving. I drove the car home 500 miles with
> not problems and have finally gotten around to pulling the ZF.
> I have a
>  centerforce clutch with a heavy duty centerforce pressure plate
> assembly from Bob Byers. I looked at SOBill's data spreadsheet and it
> recommends a Ferderal Mogul 1697 bearing. I contacted my local NAPA
> store and that bearing retails for $97 and is available for about $50 cross
> referenced to a NAPA #N1085. The bearing I've been using says TT 1181
> and USA on it.
> My problem is with the bearing in my hand, it sounds fine and looks fine
> EXCEPT it shows rubbing-metal-wear around a chamfered surface near the
> outer OD of the bearing facing the flywheel. I've posted photos on the POCA
> photo page. This chamfered surface seems to have been contacted by the
> moving weights on the centerforce clutch that effect the increased force on
> the flywheel during operation. These weights are held in place by the
> multitude of fingers and a circular spring that allows the weights to move in
> and out with rpm. These weights seem to be wearing on this
>  chamfered
> surface and creating a rough/worn
>  surface that I
>  think may be the source of
> my noise.
> I'm wondering if I have the wrong throwout bearing or a bad clutch or wrong
> installation or it's making a normal nasty noise. Anyone seen this before?
> Anyone know the correct throwout bearing to use on a centerforce clutch?
> Anyone know if I'm asking the right questions??? Thanks Scott 
>
>
>       
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