The offset (distance) on the release bearing (carbon) from the center of the
pivot to the face of the carbon doughnut is different for each one because of
the three different clutch cover (pressure plate) assemblies used. They are 9",
10" and 9 1/2" from earliest to latest cars.
The offsets differ by approximately 1/4". The thickest clutch cover is the 10"
unit with uninstalled distance from mounting face (where it connects to the
flywheel) to the surface that the carbon bearing rides measures about 3",
followed by the 9" at 2 3/4" and then the later 9 1/2" diaphragm clutch at 2
1/2". Of course this distance changes when the clutch disc and pressure plate
are bolted to the flywheel. The 9 1/2" clutch pack uses a release bearing that
measures 1 1/4 " as measured per my first sentence.
As an aside to this, some of the newer Country brand release bearings for the 9
1/2" clutch have been 1/8 inch or more thicker than the standard. This causes
a constant contact on the carbon when first installed and as a result a smoky
clutch. Reference: See my email request of six+ months ago. The bearing wears
down quickly but as a result destroys the tight fit on the carbon doughnut and
subsequent bearing failure. No fun!
In a message dated 12/21/08 13:02:05 Hawaiian Standard Time,
Moss lists three different clutch release bearings for the 6 cylinders.
501-022 BN4, BN6
501-020 BN7, BT7, BJ7 to 29F-H4878
501-032 BJ7 from 29F-H4879, BJ8
I have a new bearing - how can I identify which application it's for? I
know that one of the differences is the thickness - from the pivot to the
front face (of the holder).
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