rgb@exact.com wrote:
>
> Do the OEM throw out bearings for the TR series have a pin
> through the fork pin groove to prevent the rotation while released?
>
> I have noted one or two pins in the replacement bearings to prevent
> rotation. The causes a wear spot in the face of the groove from
> the pins constant contact with this single point during operation.
>
> While the pins may prevent free-wheeling of the bearing and associated
> problems, the wear spots prevent the self-adjusting hydralics from
> working properly, i.e. I've seen as much as a 1/4" deep wear spot on
> both sides.
>
> If I remove the pin from the new one, the wear spots will be eliminated.
>
> What is the down side of this? Send replies to me, I'll summarize.
>
> (Triumph's law: for each and every "owner" modification there is an
> equal and opposite, MUCH more expensive reaction...)
>
> Roger
ROGER:
Just finished complete clutch replacement on my TR6. The small pin
inserted in the groove around the bearing IS NEEDED. As you correctly
stated, the pin prevents the entire bearing assembly from rotating about
the input shaft housing during clutch release. When, in the past, this
full rotation occurred, it also resulted in the flattening of the pins
at either end of the fork. These flat spots then create additional
"tolerance" or play of the pins within the groove, which creates more
serious problems.
I'd leave the pin there, and install the bearing with the pin on top!
An example of lessons learned by the mfrs. (I'd also recommend replacing
the pilot bushing while you're there.)
Martin Libhart
1972 TR6 (driver)
1970 Spitfire Mk.3 (under restoration)
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