jpitman2

To me 22.2 mm is .001" away from 7/8" - take the old piston and cup to a brake shop and I bet they can help you .....Most hydraulic cups in my experience have a size moulded on them, as do many of the actual slave cylinders, and masters.
jp 83 Euro S AT 57k

jpitman2

See this old thread from 2009......https://rennlist.com/forums/928-foru...der-seals.html
Roger indicates kits are all same part no, but actual slaves are different part nos - is that different push rods, not a diameter change?
jp 83 Euro S AT 57k

Mrmerlin

See my thread 88 5speed dropped in my lap it has pictures of the S4 slave vs the 86 slave the S4 slave also has a longer body this may be needed so the maximum travel of the clutch can be used the 86 body might work for this but it’s hard to tell without precision measuring of individual assemblies

mskar

I contacted a hydraulic shop yesterday to see if they could find me a seal, they said they don’t deal with anything that uses brake fluid and that the seal composition must be made specifically for that. Sounds fishy to me but they’re the experts and I don’t want the clutch slave to start leaking a year down the road.

As Roger said, he’s going t send an 83-86 slave cylinder to me, I’ll take some measurements and see if i use some combination of parts to build a suitable replacement of the same length and travel. Seems like the only part in the rebuild kit that doesn’t fit is the seal, and it is just slightly larger. I’ll take some pictures and do a writeup when Roger’s care package arrives.

I’ll peruse the seals catalog when I have some time, if they list brake fluid compatibility and have the correct size, heck, maybe a <$5 (shipped) option can be found!

Failing that, I’ll contact the Whitepost Restorations listed above by Merchauser to see what they can do.

merchauser

White Post is very fair in cost, can do one day turnaround, and lifetime warranty.
certain you will not be disappointed.

UKKid35

I had no idea that the genuine slave was $500, but since you can get a slave made by FTE for $100, and they are relatively easy to replace, is there any reason why you wouldn't fit one?

I fitted one to my car over five years ago with no problems at all, although how I came to replace it is a story in itself.

https://rennlist.com/forums/928-foru...ands-trip.html

Don't get me wrong, I am all for using repair kits, I used one on my clutch master.

ROG100

UKKid35 - that is the main issue the FTE slaves are NLA so we are stuck with the $500 variety.

Mrmerlin

I sent FTE a E note asking them to make more of the S4 slave cylinders but never got a response,
maybe it went to the wrong address

UKKid35

Sorry, I had no idea

Presumably there are no *** versions available either?

Might be worth me ordering one from here to see if there is any stock in the UK

hacker-pschorr

Yup

Once I learned of the piston size issue with the master, I'm sticking with rebuilding the parts that worked before the seals failed.

mskar

My care package from Roger arrived last night, I don't think cannibalizing parts from an 83-86 is going to work. As previously mentioned, the body is shorter and my measurements indicate 10mm less travel on the 83-86 compared to the 87-(95?). The push rod looks to be a slightly larger diameter and quite a bit shorter, regardless I'm pretty sure I could swap the later, longer rod into place judging by the snugness of the boot that came from the rebuild kit. Bascially, it looks like the only thing that doesn't work from the rebuild kit is the seal. I called EPM (the "Seal Man"), whose document is linked above and am going to send him pictures and measurements. If he can source a properly fitting seal, I think combining the 83-86 rebuild kit with that seal might turn out to solve this issue.

I contacted WhitePost, they charge $175 for a resleeve and rebuild with a lifetime warranty. Since my cylinder is in pretty good condition, and really just missing a $3 seal, I'm going to try that route first.

oups59

$500 USD (more than 630$ CDN)

Lucky me, I have a new FTE slave that I bought a couple of years ago to keep as a spare part after mine went away on the track ....

UKKid35

Like everyone else, I would be very grateful indeed for a foolproof way to order new slave seals

So please keep us informed of your progress

If that means we order from you because you have taken the plunge and have 100s stored in your garage, then make sure you don't loose any money, and please let us order from you

Many thanks - Paul

mskar

Just an update, I have contact EPM (linked above) and talked with them a bit, they told me to get them some measurements and they'd be happy to help. I don't see any measurements on my slave cylinder piston and the button battery in my micrometer is dead. Ordered batteries and will measure, photograph, and send to him by the weekend. I'll have him send several sizes then see which fits best. I'll ask the hydraulic shop to pressure test it to ensure it doesn't leak. Hopefully we'll have a part number for a seal soon which, combined with the early rebuild kit will make it easier to rebuild a later slave.

mskar

I send this diagram off to EPM last night after measuring the slave cylinder piston as carefully as possible. I also disassembled the "burner" 83-86 slave that Roger sent me to measure the piston from that. The 83-86 is .9330" in diameter vs the .8685" diameter of the later piston.