Thanks. I finally got brave and pulled hard on the plastic cap over the hex
nut at the bottom of the reservoir. With a little rocking it came off. I
have learned (though not always adhere to it) not to force things if I don't
understand how they come apart. All went well. You're right the rubber
washer should be looked at carefully. It seems fine.
-----Original Message-----
From: Tom Hall [mailto:modtiger@comcast.net]
Sent: Sunday, September 18, 2011 10:14 PM
To: Mike Michels
Subject: Re: [Tigers] removing master cylinder reservoir
On 9/18/2011 12:10 PM, Mike Michels wrote:
> I'm replacing a GIrling master cylinder with the plastic fluid reservoir.
> Need to remove the reservoir from old cylinder and install on the new. How
> to remove it? There is a plastic "hat" at the bottom center of the
reservoir
> which I presume covers a nut or C clip that retains the reservoir. It
> doesn't come out with finger pressure, and doesn't unscrew. I don't want
to
> force it with pliers for fear of breaking it. Anybody run into this?
> _______________________________________________
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The OEM Girling reservoir is mounted on a stud with a copper washer to
seal the hex nut to the cylinder body and a rubber washer on top of the
hex to seal to the reservoir. Inside the reservoir you will find a 3/8
jam nut and steel washer which tightens down on the reservoir. The
rubber washer is centered on a raised boss above the hex, the height of
which limits the compression of the rubber washer. So the change is
accomplished by removing the nut and washer allowing the reservoir to be
pulled off the stud. Then a wrench to remove the stud and
re-installation into the new cylinder.
It is common for the rubber washer to be less than adequate after many
years of being compressed. I think the only replacement comes with a
new reservoir, as I've never seen one in a rebuild kit. You may find a
workable replacement in a plumbing store but the rubber may or may not
be suitable with Type 3 &4 brake fluid.
The old reservoir typically had a 12 point recess that fit over the stud
hex that keeps the reservoir from turning.
--
Tom Hall
ModTiger Engineering LLC
www.tigerengineering.net
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