Hydraulic Throw out bearing - Page 4

Jamo · #1 (**permalink**) 08-29-2007, 04:18 PM

Of course, there was a colonial posterior in the left seat of Sir Wilfred's Crendon several years before yours, and the owner of said hind quarters also had the bloody foresight to take a picture of the "engineering marvel" in its native surrounds.

scott h · #2 (**permalink**) 08-29-2007, 05:30 PM

i am not happy with my McLeod HTOB, if i were to change to an external slave would that also require a new bell housing or is there some kit i could use

JayBar · #3 (**permalink**) 08-29-2007, 05:54 PM

This is a very long thread with all kinds of information and opinions.
But the simple answer is no, use you current bell housing.
The easy way with out a custom bracket is to get a Wilwood Type (there are a lot cheaper ones out there) "puller" slave cylinder.

Take the rod off the back, and the rubber bellows off the front. Stick the front shaft through the hole in the Bell housing (put there for the clutch cable). Get a (don't know the name, but it is a long bolt type thing about three inches long that will screw on to the end of the Wilwood shaft) then attach the shaft you took of the rear of the Slave. It will screw into the "nut" thing. Then attach it to the yoke. It is really very simple. The slave is held in position by the connection of the shaft to the yoke no bracket needed. I will try to post a picture which will be worth a thousand words.

I would purchase my slave from:

http://www.speedwaymotors.com/GmSear...itleDescr=True

They show two models, the "universal" one has a 1/3 inch greater pull. If you need more that one inch go with that one. The cost is half the Wilwood.

Naumoff · #4 (**permalink**) 08-29-2007, 08:24 PM

Quote:

Originally Posted by Jamo

Of course, there was a colonial posterior in the left seat of Sir Wilfred's Crendon several years before yours, and the owner of said hind quarters also had the bloody foresight to take a picture of the "engineering marvel" in its native surrounds.

I thought the seat was extra comfy. Like dad's old leather recliner.

Thanks Jamo and great picture.
Wilf wouldn't let me near his home.

olddog · #5 (**permalink**) 08-29-2007, 07:07 PM

My Cobra (that I just purchased) has a HTOB in it - about 2500 miles on it. Now you all have me a little worried about it. Thanks.

Now I have to ask, are the slave cylinders having O-ring failures as well? I know they are much easier to change. What I am trying to figure out is if the failures are related to a change in the rubber chemicals that the O-rings are made of.

We had a bunch of rubber coated roller failures at work about a couple years back and traced it to a chemical change in the rubber compounds. Fuzzily I seem to remember the tree huggers stopped production of some chemical that was used. They have since improved the rubber to a tollerable level, but still not as good as it was.

Naumoff · #6 (**permalink**) 08-29-2007, 08:10 PM

Quote:

Originally Posted by olddog

My Cobra (that I just purchased) has a HTOB in it - about 2500 miles on it. Now you all have me a little worried about it. Thanks.

Now I have to ask, are the slave cylinders having O-ring failures as well? I know they are much easier to change. What I am trying to figure out is if the failures are related to a change in the rubber chemicals that the O-rings are made of.

We had a bunch of rubber coated roller failures at work about a couple years back and traced it to a chemical change in the rubber compounds. Fuzzily I seem to remember the tree huggers stopped production of some chemical that was used. They have since improved the rubber to a tollerable level, but still not as good as it was.

Everything fails but the slave is much easier to work on. That is obvious.
I don't mind pulling my trans right now. So when I have a failure I will probably just change the o-rings. Take me about three hours to pull the trans and re-install and that is with the car on jack stands.

Damn tree huggers!

Go live in a cave and leave us alone.

Don't worry about it until it happens. if it ain't broke don't fix it.

Jamo · #7 (**permalink**) 08-29-2007, 08:35 PM

Quote:

Originally Posted by olddog

My Cobra (that I just purchased) has a HTOB in it - about 2500 miles on it. Now you all have me a little worried about it. Thanks.

It's totalled.

As Tony suggests...just drive it. If it fails, then think about changing over.

Excaliber · #8 (**permalink**) 08-29-2007, 11:05 PM

Slave cylinders don't use an O ring, they use a 'cup'. Their failure is generally a result of the edges of the cup literally wearing out over time. Premature failure can occur if the surfaces of the cylinder that the cup moves back and forth in are rough (not smooth). This can happen if moisture gets in the bore and 'sits' there rusting the bottom of the bore and 'tearing' the rubber cup next time you push the clutch in! Result is sudden failure of the slave cylinder due to leaking fluid. Drive home without the clutch (as Jamo noted) and buy another one (their cheap) two bolts, a bleed and your done! Beats the heck out of dropping the trans!

BDR561 · #9 (**permalink**) 08-30-2007, 05:34 AM

Guys,

Thanks for the help and recommendations. I scrapped the HTB and went with the included external slave, I made a bracket (thanks Robert from DSCC) that bolts to the trans which holds the slave.

Works like a charm other than the fact of an initial failure (leak) of the brand new slave!!! 20 mins later bolted a new one in its place...

I actually drove my car yesterday, I will wask it, take some pics and post shortly.

Thanks to Ed and Robert from DSCC for all their help over the past few days getting everything together. Steaks and beer on me....

Mark

David Kirkham · #10 (**permalink**) 08-30-2007, 07:56 AM

Mark,

That was just the ghost of past failed hydraulic TO bearings giving you its last gasp.

David

Dingocooke · #11 (**permalink**) 08-30-2007, 01:16 PM

Quote:

Originally Posted by David Kirkham

Mark,

That was just the ghost of past failed hydraulic TO bearings giving you its last gasp.

David

Ibr8k4vetts · #12 (**permalink**) 08-30-2007, 07:42 PM

I had a slave cylinders and it was the pits

hard to push did not feel like a clutch

So I change it out too a McLeod HTOB and went through the whole nightmare everyone has talked about

But now it works Great

I can push my peddle with one finger

Naumoff · #13 (**permalink**) 08-30-2007, 08:18 PM

Quote:

Originally Posted by Ibr8k4vetts

I had a slave cylinders and it was the pits

hard to push did not feel like a clutch

So I change it out too a McLeod HTOB and went through the whole nightmare everyone has talked about

But now it works Great

I can push my peddle with one finger

What clutch master cylinder are you using? Mine is a little stiff.
I am using a .75 bore Wilwood.

I figured if I went to a larger bore it would at least shorten the stroke of my peddle.

BDR561 · #14 (**permalink**) 08-30-2007, 08:48 AM

I was telling Ed last night that the slave on my first BDR (#198) never gave me any issues. Thirty mis later, the one on #559 started leaking like a faucet...

Sure glad it was an easy replace as oppose to changing out a HTB...

Jamo · #15 (**permalink**) 08-31-2007, 02:40 PM

CNC for the slave...

JayBar · #16 (**permalink**) 09-03-2007, 09:21 AM

I finally got under the car and took some pictures of my slave setup.

There is no bracket. It just inserts through the hole in the bell housing previously used by the clutch cable. I added a thin fiberglass spacer to give it some heat insulation. You have to extent the pull arm to reach the yoke.
Works well but like all hydraulics in the BDR it needs to be flushed out on a regular basis.

http://www.clubcobra.com/photopost/d...m/PICT4814.JPG

http://www.clubcobra.com/photopost/d...m/PICT4810.JPG

BDR561 · #17 (**permalink**) 09-03-2007, 09:32 AM

Nice looking slave... I don't believe I have the ability to do that on the quicktime bellhousing. I ended up using a bracket to mount mine.