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Re: Girling Hydraulics

To: Roland Dudley <cobra@cdc.hp.com>, laifman@flash.net
Subject: Re: Girling Hydraulics
From: Bob Palmer <rpalmer@ames.ucsd.edu>
Date: Thu, 06 May 1999 12:37:12 -0700
Roland, Steve, et Listers,

A few months back I had my buddy in the shop at UCSD (it always pays to
have a "buddy" in the shop) sleeve my clutch slave cylinder in stainless
steel. So far it has worked fine; i.e., no leakage. I was concerned about
the interference fit and thermal expansion too. This is particularly
important with the slave cylinder since it sits right over the exhaust
collector. I considered having Randal install the sleeve using Locktite to
both keep the sleeve in place and prevent fluid seepage. However, I never
did more than think about it and it doesn't appear to have been necessary.
I'm sure that surface finish is a factor as well as the amount of
interference. If there is no sealant between the sleeve and cylinder body,
then I do not see any reason why silicone should be any more prone to leak
than glycol based fluids. It should only depend on viscosity I think. One
reason not to use silicone is because you need some exposure to glycol to
get the rubber to swell and seal (see, for example, Ton Hall's post a few
months back). I would suggest using Castrol or equivalent for a while and
then replace with silicone if you like.

TTFN,

Bob


At 11:02 AM 5/6/99 -0700, you wrote:
>Roland Dudley wrote:
>
>> Steve,
>>
>> I can't speak for the servo rebuild, but you might want to do some
>> research regarding re-sleeving of master cylinders with stainless.
>> I've heard, but not personally verified the following:
>>
>> 1. That silicone brake fluid will seep past a stainless sleeve/cylinder
>>    interface.
>>
>> 2. That stainless sleeves must be interference fit into the master
>>    cylinder and that the aluminum they are made of is not strong enough
>>    for this purpose.  Another possible issue is the different thermal
>>    expansion rates for stainless and aluminum.
>>
>> Roland
>
>
>
>
>A good thought, Roland.  Although the original user of one firm seems to
>have had no problem.  Besides, not sure about the synthetic in the brakes
>yet.  Using it in the clutch to see what happens.  Easier to replace.
>
>Most sleevers use brass, which has an even higher thermal expansion, but
>probably not as high as the aluminum, so maybe it keeps outer contact
>better.  These are made with a friction/press fit, so some expansion still
>leaves compression between the sleeves and the cylinder.
>
>--
>Steve Laifman         < Find out what is most     >
>B9472289              < important in your life    >
>                      < and don't let it get away!>

Robert L. Palmer
Dept. of AMES, Univ. of Calif., San Diego
rpalmer@ames.ucsd.edu
rpalmer@cts.com

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