Coaxial Clutch Release Bearing

[markmac]

https://shop.retro-engineering.co.uk/coaxial-clutch-release-bearing-kit-377-p.asp

 

I was looking through Retro-Engineering's website to see what bits they have available for 235/5 transmissions, and noticed this item 'coaxial clutch release bearing kit'.  Anyone here have any familiarity with this type of release bearing?  Off hand wondering what it plumbs into?  I wouldn't imagine there would be any need for the clutch slave cylinder.  Curious.

[Lorin]

That is a slave cylinder and throw out bearing in one unit like many modern cars use. 

[Son of Marty]

It's hydraulic probably works with your existing clutch master, The one advantage that comes to mind is it's compact and could work with a tranny that has a throw out system that is incompatible with what the 02 could accommodate.

[stone02]

yes I have a customer race car with one in it.

works well. easy to  use.

 I believe the original automotive design came

from a company named McCloud. I bought one

in 1993 for a 1949 chevy pick-up truck.

[calw]

Note that this goes inside the bell housing- It may seem difficult to change and bleed the '02 clutch slave, but at least you don't have to drop the transmission to do so. 

 

The one we replaced in my ford ranger came with the attached hose and pre-charged with fluid because bleeding it is no picnic.  While you're in there it's expedient to do the clutch also because the additional labor's almost nuthin, and the price of a clutch kit is way less than the labor to go back inside again later. 

 

But it must be much better since the scheme is used on lots of newer cars......  I guess.

 

[Son of Marty]

It looks like this one is a 2 hose set up it either recirculates the fluid and is self bleeding or has a external bleed.

[TobyB]

I used a Saab throwout 

(same design)

when I was farting around with the Nismo transmission.

 

It worked fine.

 

t

 

[John76]

3 hours ago, Son of Marty said:

It looks like this one is a 2 hose set up it either recirculates the fluid and is self bleeding or has a external bleed.

 

I was wondering the same thing....

How do modern cars bleed a release bearing like this?

Is it just a design "feature" to add service cost to a routine maintenance item??

[Ian]

I have a Tilton hydraulic throw-out bearing which looks similar to the one in the picture.  The Tilton has two lines attached to facilitate bleeding.

[Lorin]

9 hours ago, John76 said:

 

I was wondering the same thing....

How do modern cars bleed a release bearing like this?

Is it just a design "feature" to add service cost to a routine maintenance item??

I’ve just done a couple T56 transmission installs recently that use an OE GM concentric slave that only has one fluid port and line to the slave. There is a bleeder on the hydraulic line about 10 inches from the slave, outside the bellhousing. The bleeder is noticeably lower than the fluid port in the slave and my brain said no way is that going to work! 
 

But it works just fine. The bleeding process sort of works in reverse. The fluid inlet to the slave cylinder is at it’s top and the slave is nearly collapsed when installed. 
 

When you step on the clutch pedal, fluid and air are pushed down the line into the slave partially engaging it. When you crack the bleeder with the pedal still down  (on the same line!) the clutch pressure plate pushes the slave back to near collapse and sends fluid back up the line and out the bleeder. The next pedal stroke pushes the slave further so the slave returns further and a longer column of fluid and air is expelled. 
 

It works because the volume of the extended slave is much greater than the volume of the collapsed slave and the line up to the bleeder. 
 

I didn’t believe it would work til I saw it happen. 

[gracer]

There are several different designs.  Tilton, Quartermaster, etc.  Easy to bleed.  You just have to make sure the spacer is correct for it to work.  G

[Jeff]

This looks like a great option, I'm guessing it also allows you set the TO bearing height depending clutch type , single disc or twin disc, 7.25 or 5.5 clutch. 

[Ian]

The Tilton is adjustable for height.  I have the Tilton TIL-60-6104 and it threads on a collar for height adjustment.