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:
From: Dave Grandeffo <davegran@tds.net>
Subject: Re: [Spridgets] 1275 pressure plate question
To: spridgets@autox.team.net
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.
-- Dave Grandeffo
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