Modifying for conventional slave cyliner

zaph · 16th February 2017, 20:53

I have noticed that NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD- slave cylinders are killing ZT/75's, so I wondered if it would be possible to modify the gearbox to accept a conventional slave?

I know it wouldn't be easy, but in theory if you cut a slot in the bell housing facing the front of the car, mount the slave there and replaced the useless concentric slave with a pivot arm and old fashioned release bearing.

That way when the slave failed, you could replace it easily.

T16 · 17th February 2017, 03:23

What is the point?!

Fit a proper slave, and have it last the 60-100k miles most of the originals do.

EastPete · 17th February 2017, 09:11

Quote:

Originally Posted by T16

Fit a proper slave, and have it last the 60-100k miles most of the originals do.

Ross - what is your definition of a 'proper slave' ? Please enlighten us !
All the best
Cheers

Pete

T16 · 17th February 2017, 12:40

Quote:

Originally Posted by EastPete

Ross - what is your definition of a 'proper slave' ? Please enlighten us !
All the best
Cheers

Pete

AP OE slave.

As yet no experience for me with a Tazu slave, but having made sure my last slave was an OE AP job, it did another 100k and still feels like the day I replaced it.

Quote:

Originally Posted by Heddy

As said before, my only problem with the slaves was that they were melting. The metal slave has been excellent so far, 18mths and 30k miles.

This is interesting, and probably why there is such variance.

Im obviously a clutch friendly driver! I see people in other cars rocking backwards and forwards at lights and on hills, maybe this goes someway to explain why some cars have knackered clutches so fast.

zaph · 17th February 2017, 10:28

Quote:

Originally Posted by T16

What is the point?!

Fit a proper slave, and have it last the 60-100k miles most of the originals do.

The problems is the parts are NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-. This isn't unique to the 75, the quality of car parts is universally bad.

Not an issue when you can just unbolt the duff part and replace. Big issue when you have to take the car apart to get at the duff bit.

Robbberd · 17th February 2017, 11:03

not mechanically minded with this sort of stuff , is it not possible to manufacture a remote unit ?

Heddy · 17th February 2017, 11:44

As said before, my only problem with the slaves was that they were melting. The metal slave has been excellent so far, 18mths and 30k miles.

peelaaa · 17th February 2017, 12:41

My original slave lasted 135k, replacement not so sure as after 67k there is release bearing noise.

Sonic ZS · 21st February 2017, 07:35

Quote:

Originally Posted by zaph

I have noticed that NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD- slave cylinders are killing ZT/75's, so I wondered if it would be possible to modify the gearbox to accept a conventional slave?

Only yesterday I was thinking the exact same thing ! I was towing home an early CDT Tourer which was going to be crushed because the clutch slave is leaking, having been replaced in the past.

My tow vehicle is a Discovery 2 (TD5) which I coincidentally did a gearbox swap on about three weeks ago. This model has an old style, traditional slave cylinder, held in place externally with two bolts. On refitting, I had a very poor pedal which a quick bleed cured in just a few minutes (common problem on them apparently when the slave is unbolted from the bellhousing, not sure why), but it did make me think about how easy it would be to change if the seals ever went - it'd literally take no more than 10 mins, including a bleed.

So whilst I was sitting at the traffic lights, my mind started to wander around your idea to modify the 75 system. However in reality, the fine tolerances involved in getting the arm to pivot in the right place and obtaining the correct amount of travel, along with forming some sort of pivot point within the bellhousing for the arm, would all probably mean an awful lot of work if the Tazu item is proving durable.

However, the slave on the Discovery looks original, is 14 years old and has covered 160k without any problems...

murphyv310 · 21st February 2017, 07:45

Why any manufacturer would use a plastic slave in a hot environment beats me, although the plastics are designed to withstand the heat they do eventually get brittle and hairline cracks appear, this added to the the pressure of the fluid when operating the clutch can only weaken the plastic further.
If the Tazu is reliable then that surely is the only way to go.

16th February 2017, 20:53	#1
zaph Avid contributor Rover 75 Join Date: May 2015 Location: Leeds Posts: 135 Thanks: 0 Thanked 17 Times in 11 Posts	Modifying for conventional slave cyliner I have noticed that NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD- slave cylinders are killing ZT/75's, so I wondered if it would be possible to modify the gearbox to accept a conventional slave? I know it wouldn't be easy, but in theory if you cut a slot in the bell housing facing the front of the car, mount the slave there and replaced the useless concentric slave with a pivot arm and old fashioned release bearing. That way when the slave failed, you could replace it easily. Last edited by Dragrad; 24th February 2017 at 00:12.. Reason: Contravention of Club Rules - FAQ Rule 2 ;-(

21st February 2017, 07:45	#10
murphyv310 This is my second home Hyundai i10 998cc Join Date: Mar 2012 Location: Kilmarnock Posts: 6,602 Thanks: 2,088 Thanked 2,298 Times in 1,349 Posts	Why any manufacturer would use a plastic slave in a hot environment beats me, although the plastics are designed to withstand the heat they do eventually get brittle and hairline cracks appear, this added to the the pressure of the fluid when operating the clutch can only weaken the plastic further. If the Tazu is reliable then that surely is the only way to go. __________________ Cheers from Trevor MM0KJJ

17th February 2017, 03:23	#2
T16 I really should get out more....... ZT CDTi 135, ZT260SE Join Date: Feb 2011 Location: Dundee Posts: 2,877 Thanks: 10 Thanked 331 Times in 213 Posts	What is the point?! Fit a proper slave, and have it last the 60-100k miles most of the originals do.

17th February 2017, 11:03	#6
Robbberd Loves to post MG ZT Join Date: Feb 2012 Location: Wrexham Posts: 407 Thanks: 64 Thanked 5 Times in 5 Posts	not mechanically minded with this sort of stuff , is it not possible to manufacture a remote unit ?

17th February 2017, 11:44	#7
Heddy This is my second home None Join Date: Feb 2013 Location: None Posts: 5,556 Thanks: 465 Thanked 1,161 Times in 924 Posts	As said before, my only problem with the slaves was that they were melting. The metal slave has been excellent so far, 18mths and 30k miles.

17th February 2017, 12:41	#8
peelaaa Posted a thing or two 75 cdti 2004 contemporary Join Date: Apr 2008 Location: meath Posts: 1,551 Thanks: 272 Thanked 80 Times in 58 Posts	My original slave lasted 135k, replacement not so sure as after 67k there is release bearing noise.