Ok, I have a spare clutch kit I can install if needed. The 'free pedal'
concept makes sense to me. I'm guessing that there is some difference in
my replacement slave cylinder, with the result effectively being that my
push rod is now too long, keeping the TO bearing in contact with the
diaphragm and causing an overthrow condition.
In order to obtain the free pedal and appropriate TO bearing clearance,
I suppose I'll need to shorten the push rod by some fractional
increment(s) until I have it right.
Hopefully, it's as simple as gaining the clearance necessary and there
"should" be ample travel left for proper disengagement? Um, how far is
too far (overthrow condition)?
Ron Soave wrote:
> The instructions on my goofy Tilton clutch are very good in this respect - you
> put the car in gear, wheels up in the air, verify wheels don't turn. With
> assistant trying to turn wheels (he's usually curling, but still...) verify
> pedal is depressed some amount (I forget their exact recommendation, say
> 5/16") when wheels release. Set stop at some distance past that (like 3/4") to
> prevent over throw. We set it up with a fancy dial indicator, then just did it
> by feel at the track when it acted totally different.
>
> --- On Wed, 5/6/09, Dave Grandeffo <davegran@tds.net> wrote:
>
> Date: Wednesday, May 6, 2009, 3:22 PM
>
> David Riker wrote:
>
>> The TO bearing is supposed to be in constant contact with the pressure
>>
> plate. Like the pads on disc brakes, there is no spring to pull the throw out
> bearing away. It is the diaphram spring itself returning to rest that pushes
> back on the TO bearing....
>
>> David R.
>>
> Not to start an argument, but every clutch I've worked on is supposed to be
> set up with a measurable amount of "Free Pedal". This means that the first
> small increment of clutch pedal travel (typically 1/2" -1" or thereabouts -
> check your manual) doesn't move the pressure plate. In other words, there
> should be no tension/pressure on the throwout bearing. A lack of free pedal
> means that the throwout bearing is being held against the pressure plate, is
> spinning constantly, and will have a greatly reduced life span. This is the
> same reason you shouldn't come up to a stop sign and stay in gear with the
> clutch disengaged, no matter what they say in driver's ed....
>
> I've never had to replace a throwout bearing on one of my own cars and I
> usually keep 'em for over 200,000 miles before they succumb to the tin worm. A
> throwout bearing is not designed to spin constantly.
>
--
Marc
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