TR6 72 TR6 clutch high engagement point

[bfitz]

Trying to help a friend out. He had someone install a new clutch master and slave in his TR6. Engagement point has gone from normal to about 1/2" before top of pedal travel. Any ideas? This is a new one on me.
We're going to check the easy stuff like the slave cylinder mounting and fluid level, but was wondering if anyone's seen this before.
Thanks

 

[rjc157]

Is the push rod in the slave in the middle position.

 

[bfitz]

yes it is

 

[rjc157]

Moss sells an adjustable rod for about 35.00 it should help.Maybe with all new parts he has nothing to compare it too unless you have a tr6.

 

[bfitz]

Unfortunately, I've got a Jensen Healey. It has a cable clutch. Is there supposed to be any play in the clutch rod? His is under compression even when released. My car has .060 slack when released[yes, I set it with a feeler gauge] It's been a long time since I fought with a hydraulic clutch.
Air in the system would lower the engagement, right?

 

[Gliderman8]

Is there a slave return spring?

 

[CJD]

I was going to suggest you check the adjustment, to ensure the release bearing is not riding on the clutch diaphragm full time. Elliot's spring idea would cause that too.

But, if you are adjusted at the .06" play, then the release bearing should be disengaging and you should be good. The disc you used has a large affect on the release point. Many discs have a "springiness" to the faces to slow the engagement. If you have a disc with no spring, then the engagement point will be much higher. I have a newer model Vette with a hydraulic clutch, and it disengages within the first inch of travel. My TR2 waits until about an inch from the floor. It really freaks me out changing from one to the other, but both are working properly!

 

[bfitz]

I was going to suggest you check the adjustment, to ensure the release bearing is not riding on the clutch diaphragm full time. Elliot's spring idea would cause that too.

But, if you are adjusted at the .06" play, then the release bearing should be disengaging and you should be good. The disc you used has a large affect on the release point. Many discs have a "springiness" to the faces to slow the engagement. If you have a disc with no spring, then the engagement point will be much higher. I have a newer model Vette with a hydraulic clutch, and it disengages within the first inch of travel. My TR2 waits until about an inch from the floor. It really freaks me out changing from one to the other, but both are working properly!

You read that wrong, I adjusted the clutch on my Jensen to .060".
There is no adjustment on this TR and the clutch rod is under constant compression. No movement at all.
I'm starting to think there's a problem either in the master or the slave

 

[bfitz]

Is there a slave return spring?

View attachment 55059

No return spring

 

[bfitz]

Slave is mounted as it should, on the rear side as indicated in the picture

 

[Gliderman8]

I believe that pic show the mounting to be incorrect... the mounting plate goes on the other side of the bell housing (I think). I only posted that pic to show the spring return. I have a hydraulic clutch in mine and it's been a while since I removed the slave but I do think the mounting plate needs to be moved. Hopefully others will chime in on the position of the mounting plate.

 

[Gliderman8]

Like this...

 

[CJD]

You read that wrong, I adjusted the clutch on my Jensen to .060".
There is no adjustment on this TR and the clutch rod is under constant compression. No movement at all.
I'm starting to think there's a problem either in the master or the slave

Then it needs to be adjusted properly. If there is zip clearance, then the release bearing is spinning at all times, and that explains the high engagement point. Without a return spring the slave cylinder may not return to it's compressed position.

In short, the adjustment is off.

 

[CJD]

Well, disregard! I just studied up on the TR6 manual. There is no adjustment at all, unlike the pics shown above. The TR6 is designed for the bearing to ride on the clutch.

There is nothing wrong with the clutch engaging with a high pedal, so long as it IS fully engaging. It sounds like your friend was accustomed to operating a worn out clutch...and how did the Jenson get in the conversation?!?

 

[poolboy]

This is a TR6 slave cylinder, properly mounted, no washers used as spacers, no external spring and no adjustable push rod.

 

[bfitz]

This is a TR6 slave cylinder, properly mounted, no washers used as spacers, no external spring and no adjustable push rod.

View attachment 55080

Thanks for that. That's how his is mounted. It'll be his decision how he wants to proceed. Thanks for the help

 

[Tr6easyrider]

The slave has an internal light spring, which makes it self adjusting. If everything is right, there is no need for an external spring or an adjustable rod.
https://www.buckeyetriumphs.org/technical/clutch/ClutchHydraulics/Clutch_Hydraulics.htm