The carbon faced to's were not designed to have the car in gear during long
stops (like stop lights). You were supposed to select neutral, and take your
foot off the clutch.
Sent from my Verizon Wireless Phone
----- Reply message -----
From: Paul.Tonizzo@sybase.com
Date: Tue, Jun 1, 2010 08:24
Subject: [Tigers] Tigers Digest, Vol 4, Issue 233
To: <drmayf@mayfco.com>
Cc: <tigers@autox.team.net>
No problem. :')
You do raise an interesting point though. British cars (like my MGA) have
a carbon-
faced bearing that wears - not a bearing at all in the conventional sense.
However, the same issue of contact and excessive wear would exist.
I do know that the clutch hydraulics were designed to allow backflow of
fluid - perhaps bearing
contact was the reason for this?
In any case, I can see that the Tiger release bearing WOULD benefit from
using a spring.
Paul
drmayf <drmayf@mayfco.com> wrote on 05/31/2010 05:23:57 PM:
> Paul, let me chime in here on your thread... no criticism of your
> message...
>
> Cars from teh era of our Sunbeams had mechanical clutch actuation
> schemes. her was a cross bar with a couple of levers and a big return
> spring. Clutches were adjusted so that the clutch pedal has a bit if
> free play at teh foot. Not much but always some. That was to keep the
> throwout bearing from riding continously on the clutch forks. Our throw
> out bearing were not intended to runn on teh clutch fingers full time.
> Now along comes Sunbeam and probably others. They used the hydraulic
> clutch actuation system because getting a mechanical clap trap to work
> would heva been difficult at best. So hydraulic was really good for
> making them work. But, the hydraulic versions keep teh throw out bearing
> surface in constant contact with the clutch fingers. Thats why they
> wore out and make lots of racket in teh olden days. I had to replace
> mine a time or two and indeed every time I had the engine out, I changed
> that sucker. Todays clutches and throw out bearings generally have a
> higher tolerance for running in full contact. So if replacing, try and
> get a hydraulic throwout bearing designed to run in full contact all the
> time. Ditto for the clutch fingers. And you'll be a happier camper...
>
> mayf
>
> Paul.Tonizzo@sybase.com wrote:
>
> >Hydraulic clutch slaves are self-adjusting and a return spring is not
> >needed (at least that's what other British cars do). The piston moves
up
> >the bore as the clutch wears. So just fit a pushrod that almost bottoms
> >out the piston to start.
> >
> >Paul
> >
> >
> >
> >>Subject: [Tigers] Clutch cylinder rod adjustment
> >>There's been lots of talk about throwout bearings. I wonder...
> >>
> >>Is there a problem with the clutch master cylinder or slave cylinder?
> >>
> >>The original slave push rod in my Tiger was a cut off carriage bolt.
> >>
> >>
> >When I
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