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Re: [Mgs] B/GT gearbox mystery

To: mgs@autox.team.net
Subject: Re: [Mgs] B/GT gearbox mystery
From: Paul Hunt <paulbhunt73@gmail.com>
Date: Mon, 7 Oct 2024 16:40:09 +0100
Delivered-to: mharc@autox.team.net
Delivered-to: mgs@autox.team.net
References: <1250110833.1317283.1727129345861@epix.net> <003f01db188c$24f1b530$6ed51f90$@planet.nl> <5b09dcc029704a0bbe581dc960046c69@ranteer.com>
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If you mean the clutch pushrods, if that appeared to fix it then 
something else was wrong that was fixed in the process.

All the slave pushrod does is position the slave piston in the slave 
cylinder.  The MGB system is self-adjusting which means that when you 
release the clutch pedal the clutch cover springs push the release ring 
back, which pushes the release bearing back, which pushes the release 
arm back, which pushes the slave push-rod and piston back, which pushes 
fluid back into the master reservoir.  The length of the slave push-rod 
doesn't directly affect that.  If it's too long it can bottom the piston 
in the cylinder and prevent the clutch from being fully engaged, which 
can cause clutch slip.  If it's too short fluid displacement from the 
master can push the piston out of the end of the cylinder.

If the master push-rod is shorter than it should be then the pedal 
footpad is lower than it should be, it doesn't travel as far as it 
should before reaching the floor and you get a low biting point.  That 
can cause grinding when selecting reverse, which was covered way back, 
and there has been no response to that or any of the suggestions.  If 
that push-rod is lengthened the pedal pad sits higher and can travel 
further, which can push the pressure seal to the end of the cylinder and 
damage it.

PaulH.

On 07/10/2024 15:37, dave northrup wrote:
> Try adjusting the pushrods,  making them longer.  I know it sounds 
> crazy,  but i had a similar problem and that fixed it.   People on 
> this list even said don't do it,  but i did it anyway.   Now it works
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    <p>If you mean the clutch pushrods, if that appeared to fix it then
      something else was wrong that was fixed in the process.</p>
    <p>All the slave pushrod does is position the slave piston in the
      slave cylinder.  The MGB system is self-adjusting which means that
      when you release the clutch pedal the clutch cover springs push
      the release ring back, which pushes the release bearing back,
      which pushes the release arm back, which pushes the slave push-rod
      and piston back, which pushes fluid back into the master
      reservoir.  The length of the slave push-rod doesn't directly
      affect that.  If it's too long it can bottom the piston in the
      cylinder and prevent the clutch from being fully engaged, which
      can cause clutch slip.  If it's too short fluid displacement from
      the master can push the piston out of the end of the cylinder.<br>
    </p>
    <p>If the master push-rod is shorter than it should be then the
      pedal footpad is lower than it should be, it doesn't travel as far
      as it should before reaching the floor and you get a low biting
      point.  That can cause grinding when selecting reverse, which was
      covered way back, and there has been no response to that or any of
      the suggestions.  If that push-rod is lengthened the pedal pad
      sits higher and can travel further, which can push the pressure
      seal to the end of the cylinder and damage it.<br>
    </p>
    <p>PaulH.<br>
    </p>
    On 07/10/2024 15:37, dave northrup wrote:<br>
    <blockquote type="cite"
      cite="mid:5b09dcc029704a0bbe581dc960046c69@ranteer.com">
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      Try adjusting the pushrods,  making them longer.  I know it sounds
      crazy,  but i had a similar problem and that fixed it.   People on
      this list even said don't do it,  but i did it anyway.   Now it
      works</blockquote>
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