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Old 19th February 2017, 16:40   #11
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There is a vauxhall corsa one that might fit - all metal..
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Old 20th February 2017, 13:06   #12
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Quote:
Originally Posted by peelaaa View Post
My original slave lasted 135k, replacement not so sure as after 67k there is release bearing noise.
Peelaaa: How would you describe 'release bearing noise'? I am trying to track down two unidentified noises on my 75.
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Old 20th February 2017, 14:09   #13
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Quote:
Originally Posted by mossrose View Post
Peelaaa: How would you describe 'release bearing noise'? I am trying to track down two unidentified noises on my 75.
Im no expert but 2 garages said it is.

When you press the clutch pedal the noise appears. Its like a whirring sound, no vibration, just a noise. It increases in frequency when the engine is revved with the pedal still pressed.
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Old 21st February 2017, 08:35   #14
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Quote:
Originally Posted by zaph View Post
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...
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Old 21st February 2017, 08:45   #15
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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.
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Old 21st February 2017, 08:52   #16
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Hi Guys, there is a similar hydraulic system with the brakes BUT rarely
issues are reported ...

To me the main culprit is the seal ..... material quality,lubrication,shape etc..



Mike

Last edited by FrenchMike; 21st February 2017 at 09:39..
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Old 21st February 2017, 21:28   #17
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Quote:
Originally Posted by zaph View Post
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.
However--Assuming the slave cylinder lasted quite a while before it finally stopped working you will still have a good amount of wear on the release bearing.--

Five minutes after repairing the slave you might be taking the gearbox off to fit a new release bearing.--

Last edited by Dragrad; 24th February 2017 at 01:14..
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Old 23rd February 2017, 16:12   #18
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Thanks Peelaaa, much appreciated.
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Old 24th February 2017, 19:42   #19
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Maybe the OP's idea was not a good one as this thread seems to have nose dived into oblivion.

Sounded quite expensive to do as well.---

Possibly because our cars have so little street value now.--
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Old 24th February 2017, 20:49   #20
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I think that a lot of slave/release bearing problems are caused by sitting, with the engine in gear and the clutch pressed. "Old school" driving instructors told us to disengage gear and sit with the vehicle in neutral, with the handbrake on. I've always driven that way and have never (touch wood) had a slave/release bearing problem with any of my vehicles. ( I know that modern driving instructors tell students/learners to be in gear, at the ready to move off when road conditions allow. ) IMHO The pressure generated on the release bearing, in that extremely hot environment would soon lead to loss of lubrication and failure of the materials, particularly plastics.
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