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Author Topic: Clutch won't disengage
Sphinx Verified Driver
M. Yusuf Mohamed

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I replaced the slave cylinder due to a failure. I didn't know to squeeze the boot, but basically, the pedal would return up, but there was no resistance from the clutch pedal.

I started the car up (while up on jackstands) and went to run to run it through the gears. Interestingly, while the clutch pedal was still in, the wheels started turning. As soon as I applied the brakes, it started to shake like it was going to stall.

What am I missing? Or was this an incorrectly diagnosed master failure?

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Sphinx Racing
Atlanta Region
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JIM DANIELS Verified Driver Made Donation to Website Series Champ
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Year : "You Pick"
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Did you bleed it? You need to bleed it.

http://www.youtube.com/watch?v=vKV8a0QL5uk

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Jim Daniels

MAZDARACERS.COM

Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by JIM DANIELS:
Did you bleed it? You need to bleed it.

Of course. And the pedal still feels like crap. Unlike before, I now get resistance once the pedal swings about 1/3 of the way down. I'll bleed it some more tonight, just to be sure.

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Sphinx Racing
Atlanta Region
http://www.sphinxracing.com
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Alberto M Goncalves
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Region: SFR
Year : 1990
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Probably the master. The internal seals let go and doesn't hold pressure when trying to move the slave.

JIM DANIELS Verified Driver Made Donation to Website Series Champ
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Keep bleeding.

Open the slave, push to floor, close. Do this until fluid comes out on the push. Then bleed normally and see.

Did the piston come out? If so, make sure the o-ring is installed properly.

When asking for help you need not reply with "Of Course" as readers have no idea what you did or know...... [Smile]

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Jim Daniels

MAZDARACERS.COM

Steven Holloway Verified Driver Made Donation to Website
Blue Eyes, Aquarius, hates being squeezed to the grass in SowDiv!

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Or your throwout bearing has come apart.

Does it make any noise when you push the pedal in?

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If you can't fix it with a hammer, it's got electrical problems.

Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by JIM DANIELS:
Keep bleeding.

Open the slave, push to floor, close. Do this until fluid comes out on the push. Then bleed normally and see.

Did the piston come out? If so, make sure the o-ring is installed properly.

When asking for help you need not reply with "Of Course" as readers have no idea what you did or know...... [Smile]

True. [Smile]

No, piston didn't come out. And I took a look at the old slave, no oil inside the slave. And the brand new one I put on still feels like crap after leaving it to gravity bleed for about 2 hours tonight.

I didn't do the "reverse bleed" shown in the video, as my assistant (wife) was unavailable tonight.

quote:
Originally posted by Steven Holloway:
Or your throwout bearing has come apart.

Does it make any noise when you push the pedal in?

The throwout bearing is brand new. What had happened is that we had the failure at the track. It was misdiagnosed as a clutch failure. We replaced the clutch, pressure plate, throwout and pilot bearings. Car ran fine for a few laps as the driver couldn't get the trans to shift anymore. At that point, we figured that it was a hydraulic failure.

The only noise (with the old slave) was that I would hear a "click" from the slave each time the pedal was depressed. Couldn't get the car into any gear. But I wasn't getting the whole wheel turning thing I'm seeing now.

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Sphinx Racing
Atlanta Region
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Qik Nip Verified Driver Made Donation to Website Series Champ
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Car #: 60
Year : 1990
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As Jim said, you need to keep bleeding. It may well take a dozen cycles of "pump-hold-open-close" to purge the line and the new slave. If it doesn't come up after that, you likely changed the wrong hydraulic cylinder (don't ask how I know).
Rick

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Fortune Cookie Racing SM 60
Directions for use: Race, Rumple, Repair ... Repeat!

Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by Qik Nip:
As Jim said, you need to keep bleeding. It may well take a dozen cycles of "pump-hold-open-close" to purge the line and the new slave. If it doesn't come up after that, you likely changed the wrong hydraulic cylinder (don't ask how I know).
Rick

[rolling on floor laughin] Well, my other choice is to cry about it. But yea, I think that I changed the wrong one. [Smash] Pedal still sucks after 30 minutes of bleeding with my trusty assistant.

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Sphinx Racing
Atlanta Region
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Frank Todaro
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I had this problem last fall and it was a bad clutch, it was gone no friction material and the Pilot Bering was shot.

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Frank
Member: No Pain Racing

Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by Frank Todaro:
I had this problem last fall and it was a bad clutch, it was gone no friction material and the Pilot Bering was shot.

In my case, I pray that is not the case. Remember this all began with a clutch change, which was putting in a ACT 4 puck & PP. Otherwise I just blew a chunk of $$.

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Sphinx Racing
Atlanta Region
http://www.sphinxracing.com
http://www.layersdesserts.com
Support our racing efforts by shopping at your favorite online merchants at SphinxRacing.com!

Frank Todaro
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quote:
Originally posted by Sphinx:
quote:
Originally posted by Frank Todaro:
I had this problem last fall and it was a bad clutch, it was gone no friction material and the Pilot Bering was shot.

In my case, I pray that is not the case. Remember this all began with a clutch change, which was putting in a ACT 4 puck & PP. Otherwise I just blew a chunk of $$.
Sorry I missed that part, then I would expect the clutch material to be just fine, but I would look at the pilot or something popping apart in there. After you have bleed the clutch master and the slave and convinced your have got the air out of it, there is not much left to do at that point but crack the trans case and take a look see.

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Frank
Member: No Pain Racing

Al Smith
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Try adjusting the pedal.

Keith in WA Verified Driver Made Donation to Website
Pack Fodder

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Probably not the pedal if it won't come back up. I had that one.

Replaced the clutch, new clutch slipped, pulled the trans, cleaned everything thinking it was an oil leak, still slipped, replaced the slave, still slipped, bled the bejesus out of it, nada, pulled the trans again, no sign of oil. Then I remembered I had adjusted the pedal prior to the new clutch but not after. Too tight. Loosened it up. Bingo.

[banghead]

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Keith Novak
(Will work for tires)

Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by Keith in WA:
Probably not the pedal if it won't come back up. I had that one.

Replaced the clutch, new clutch slipped, pulled the trans, cleaned everything thinking it was an oil leak, still slipped, replaced the slave, still slipped, bled the bejesus out of it, nada, pulled the trans again, no sign of oil. Then I remembered I had adjusted the pedal prior to the new clutch but not after. Too tight. Loosened it up. Bingo.

[banghead]

Yea, I'm wondering if that's not it too. I've replaced the master (for $35 worth doing anyway), and the pedal still sucks. So, gonna adjust it and see what happens.

It's behaving almost like the piston on the slave isn't extending far enough. So, either the pedal is off or the clutch release fork is bent (which I've never heard of happening).

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Sphinx Racing
Atlanta Region
http://www.sphinxracing.com
http://www.layersdesserts.com
Support our racing efforts by shopping at your favorite online merchants at SphinxRacing.com!

MazdaSteve Verified Driver
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Region: CCR
Car #: 14 SM
Year : 1990
Posts: 36
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Change the Master & Slave as a set. Make sure you bench bleed the Master before putting it on the car.

Ensure the clutch fork is mounted properly on the bell housing and the clutch rod is in place.

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Seneca Motorsports
Sponsored by Race Engineering
"American by birth, CONSERVATIVE by the grace of GOD"!

MazdaSteve Verified Driver
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Car #: 14 SM
Year : 1990
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I thought John just replaced the clutch assembly at the ARRC enduro last year?

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Seneca Motorsports
Sponsored by Race Engineering
"American by birth, CONSERVATIVE by the grace of GOD"!

Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by MazdaSteve:
I thought John just replaced the clutch assembly at the ARRC enduro last year?

Exactly, clutch, both bearings & pressure plate. Over the last week, I replaced the slave, and when that didn't fix it, the master too. Problem is still there.

So, I'm trying to check the easy stuff before dropping the tranny. And if that's required, then I'm gonna wait till we get togther to prep it.

I just want it drivable to get it on the trailer.

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Sphinx Racing
Atlanta Region
http://www.sphinxracing.com
http://www.layersdesserts.com
Support our racing efforts by shopping at your favorite online merchants at SphinxRacing.com!

MazdaSteve Verified Driver
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Region: CCR
Car #: 14 SM
Year : 1990
Posts: 36
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Air.

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Seneca Motorsports
Sponsored by Race Engineering
"American by birth, CONSERVATIVE by the grace of GOD"!

Glenn Verified Driver
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Region: CCR
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Take it to Fowler and let him fix it, LOL

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Glenn
Crew chief Meathead Racing, NE Region Sales Division Race Engineering, The GOLD standard in SM engines, Occasional race slave for OPM Autosports

Dave Lewis
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Region: detroit
Car #: 17
Year : 1991
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Do you still have the curly metal line? If so, junk it and get the full length flex line from Dave Wheeler. Best thing I ever did.

   

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