Paul Deslandes Posted August 3, 2014 Share Posted August 3, 2014 My external hydraulic clutch slave cylinder has developed a weep around where the hose coupling screws into the cylinder body. The thread is parallel not tapered so I don't think PTFE tape is the answer although I might be persuaded to give it a try. The mating surface of the cylinder is cylindrical (funnily enough) so a sealing washer of some sort won't work. Is there a suitable sealant/thread lock that would do the trick? I suspect that's what was used previously and had lost its seal when I took the engine out recently. Please don't tell me to revert to a cable, I don't want to Thanks Paul Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 3, 2014 Member Share Posted August 3, 2014 If you're sure it seals on the thread and not on an end surface (cone/ flare/ washer/ O-ring etc) what options do you have? Loctite 542? Usual platitudes about cleaning and inspecting. Jonathan Edited by - Jonathan Kay on 3 Aug 2014 21:24:15 Link to comment Share on other sites More sharing options...
Paul Deslandes Posted August 3, 2014 Author Share Posted August 3, 2014 Hi Jonathan. Yes, it's definitely the thread as the coupling goes right through the cylinder sleeve. 542 is the only sealant I've found too, although I might consider an epoxy of some sort as that's what's been used to seal the bleed nipple adapter. If it was brakes I'd look for another solution but as the clutch is slightly less safety critical I can try a couple of options. Paul Link to comment Share on other sites More sharing options...
Mavic82 Posted August 3, 2014 Share Posted August 3, 2014 Paul, I will check the number tomorrow night if you have not found a solution but I would try a loctite hydraulic sealant. Much like thread lock but specifically intended to seal threads against seeping fluids. I use it on my dry sump fittings but equally at home on your nearest JCB. Edit to add a quick google shows either 542 or 569. Can check which I use tomorrow. Cheers Guy Edited by - Mavic82 on 3 Aug 2014 21:40:58 Link to comment Share on other sites More sharing options...
Paul Deslandes Posted August 3, 2014 Author Share Posted August 3, 2014 Thanks Guy. Loctite 545 or 565 look to the right stuff although I suspect that even a small amount will be expensive. I might see if I can find the local Pirtek service man as he's bound to have something. Link to comment Share on other sites More sharing options...
Birkin S3 ZA. Posted August 4, 2014 Share Posted August 4, 2014 I always use Loctite 567 for sealing high pressure hydraulics 10,000 psi its very good and a bit thicker than the other products. Link to comment Share on other sites More sharing options...
Paul Deslandes Posted August 4, 2014 Author Share Posted August 4, 2014 The Pirtek man wasn't able to help so I decided, as it's clutch not brakes, to make a conformal nylon washer that follows the curve of the cylinder and apply the Loctite 243 that I use for normal thread locking/sealing applications. It tested okay under heavy foot pressure so I remain optimistic 😬 Thanks for inputs Paul Link to comment Share on other sites More sharing options...
Mavic82 Posted August 4, 2014 Share Posted August 4, 2014 Ok, for reference I have just come in from the garage and I use 542. Guy Link to comment Share on other sites More sharing options...
Paul Deslandes Posted August 4, 2014 Author Share Posted August 4, 2014 thanks for that Guy. If I get a repeat of the problem I'll have to buy a bottle. Paul Link to comment Share on other sites More sharing options...
elie boone Posted August 5, 2014 Share Posted August 5, 2014 Didn't the original connection had a brass fitting ? this brass fitting would have been conical. If you tighten the connection make sure it isn't too long thus blocking the axe so it wont work properly. Link to comment Share on other sites More sharing options...
Paul Deslandes Posted August 6, 2014 Author Share Posted August 6, 2014 Unfortunately not Elie, the thread is parallel without any taper. My 'fix' using a thick nylon washer and standard Loctite 243 seems to be working so far. Link to comment Share on other sites More sharing options...
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