Just to update the clutch hydraulics problem...I think I found the culprit.
It's the new master cylinder. I was replacing my old master cylinder with a
new one because the old one was leaking fluid (ruined my front carpet). But
the old one still actuated the clutch just fine. This evening, after trying
to bleed and re-bleed the system endlessly, I pulled the new cylinder off
and put the old one back on just to check it. Within two minutes (using the
Mityvac bleeding system), the clutch was actuating perfectly. And this after
I spent all day trying to bleed that thing. So I need to replace the new
cylinder and that should solve my problem. By the way, the trick someone on
the list mentioned about pushing the slave cylinder rod in to push air out
of the slave works great. That's a trick I've used in the past when I was
bleeding the old fashioned way. But it doesn't seem to be necessary with a
vacuum bleeding system. I also wanted to say that I flushed a lot of fresh
fluid through the system and I bet I have the cleanest clutch hydraulics in
town (even with my old master cylinder). It really is a good idea to flush
it through several times at the expense of a 32 ounce can of fluid. I had
never flushed that much fluid through in the past and always ended up with
some gray or black color in the "new" fluid.
Thanks for the advice!
Greg
76 TR6
68 MGB/GT
----------
From: Steve Chandler [SMTP:chand@primenet.com]
<mailto:[SMTP:chand@primenet.com]>
Sent: Saturday, January 16, 1999 6:38 PM
To: Hutmacher, Greg
Subject: Re: TR6 clutch hydraulics
Sometimes air bleeds past the bleed nipple threads when you use a vacuum
pump, giving you a false indication that there is air in the line. Try to
close the bleed valve as much as possible when you use the pump.
With all the things you have tried, I would begin to suspect that the new
master cylinder is bad (unlikely but a possibility).
Also check that the bleed valve is in the top hole in the slave cylinder,
maybe there is air trapped in the slave...
cheers
steve
"Hutmacher, Greg" wrote:
>
> Thanks, Steve, I'll give it a try. I just went out and bought a
one man
> vacuum bleeding system for about $40 after I posted the question
this
> afternoon. It pulls a vacuum at the bleeder screw on the slave
cylinder and
> allows one person to bleed. Unfortunately, I've had no more luck
with it.
> I've fed a total of about 40 ounces or more through and it still
is not
> actuating the clutch. It appears to still have air in the lines
because the
> clear tube is still pulling bubbles. And the slave cylinder is
installed
> right way up with the bleed valve on top. I'm going to try your
method now.
> If that doesn't work, I guess I'll have to pull the master
cylinder and
> start over.
> Thanks, Greg
>
> ----------
> From: Steve Chandler [SMTP:chand@primenet.com]
<mailto:[SMTP:chand@primenet.com]>
> Sent: Saturday, January 16, 1999 4:18 PM
> To: Hutmacher, Greg
> Subject: Re: TR6 clutch hydraulics
>
> You might want to try bleeding the master cyclinder. This
is done by
> loosening the pipe
> from the master to the slave, and then pump the pedal a
couple of
> times.
> Put a rag over the
> screw because the fluid is going to squirt over your
paint.
>
> steve
>
> "Hutmacher, Greg" wrote:
> >
> > I'm embarrassed that I'm having to ask this, but
I've just spent
> all day
> > trying to bleed my TR6 clutch hydraulics and
have been
> unsuccessful. I've
> > done this simple task a number of times over the
years and have
> never had
> > this much trouble. I've just installed a new
master cylinder as
> the old one
> > was shot. I did not replace the slave cylinder
since it appears
> fine. I
> > flushed a significant amount of fluid through to
flush the
> impurities out
> > before I closed the bleed screw. Then I began
bleeding the system
> with the
> > traditional bleed tube in a glass jar full of
hydraulic fluid. I
> am getting
> > no air bubbles through the bleed tube anymore,
but the clutch
> peddle has
> > little resistance and is not actuating the
clutch. If the job is
> done right
> > and all goes well, how long does it take to get
the air out?
> Maybe there is
> > some obvious thing I've overlooked. I hope so.
Thoughts?
> > Thanks, Greg
> > 76 TR6
> > 68 MGB/GT
>
> --
> Steve Chandler - Chandler O'Bagy chand@primenet.com
<mailto:chand@primenet.com>
--
Steve Chandler - Chandler O'Bagy chand@primenet.com
<mailto:chand@primenet.com>
|