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Post by biggles on Aug 26, 2017 8:50:06 GMT
I have finally got around to checking why the Clutch master cylinder has been losing fluid and it's clear it's the slave that's been leaking. The pin (?) that operates the clutch has been at a crazy angle. I didn't think there should be any fluid this side of the cylinder but there was loads. As you can see from the pictures below, the rubber boot is deformed and needs to be replaced. The pin and cylinder have a minor mark where they've been touching but I don't think that's much of a problem. The round clips (circlip type things) are pitted and worm but might clean up ok. ( ![]() For some reason I can't get these images to display in the message - sorry) ibb.co/k2O51kibb.co/cvV7E5ibb.co/nF63nQDo I need to ; a) just replace the boot and perhaps the circlips? b) dismantle the assembly and replace anything inside? c) try and buy a complete slave cylinder? Bob - are these bits available in club spares ? Simon  ![]() |
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Post by noddy on Aug 26, 2017 9:59:56 GMT
Hi Simon, If I was you I would replace the whole thing - just to be on the safe side. It is more than likely that the bore of the cylinder is rusty/scored/pitted and even after replacing the seals it will still leak. So replace! Original Riley 1.5 ones are quite expensive - but I believe Bob may have some in stock. However I am positive that an MGA one will fit as a direct replacement (I vaguely remember fitting one to our racing 1.5 many years ago!) - the bonus of these are that they are much cheaper. One thing ... I am a bit surprised at the angle that the push-rod has been pushing on the cylinder  - I would double check that everything is squared up when you fit the new one. Let us know how you get on, All the best Roger |
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Post by canuck on Aug 27, 2017 16:54:27 GMT
Simon There is something amiss with your slave cylinder internals, particularly the piston. This actuator piston should/has a machined concave side that centers the actuator rod. The one you show is not at all like this.
The 'flat' side you show is for the main rubber seal to align with.
This piston is either the incorrect part or installed backwards
So you can buy a replacement cylinder, or kit the existing one, 2 new seals and assemble correctly.  The bore of the cylinder needs to be in good shape to do its job, and may not be rebuild able, so take a look. I chose to have my OE cylinder sleeved, but this is just me.
Although I think Roger solution of a MG A/B slave cylinder will function, my aging memory tells me that the cylinder bore of the Riley slave cylinder is a different diameter. If we use our high school physics, (Pascals law)  the hydraulic pump, in this case the master cylinder, is sized to the actuating piston, in this case the slave cylinder. So in this case maybe size matters?
Have fun
B |
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Post by biggles on Aug 27, 2017 18:39:11 GMT
How strange - I did think that the flat piston pressing against a bar was sort of imprecise. I have ordered a complete new unit from club spares so it'll be interesting to see how it differs from the current one.
Simon
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Post by canuck on Aug 28, 2017 14:32:00 GMT
Simon One more thing that is amiss with your clutch cylinder assembly. The actuator pushrod should have a rounded end where it fits to the concave face of the cylinder piston.
Don't pay any attention to the lower rod in my photo, this was a Bruce invention!
Use the rod you have you will only need to round off the end on the grinder. Not doing so will cause grief with the centering/aligning of this rod,
B |
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Post by biggles on Aug 28, 2017 15:32:44 GMT
I knew it - it's really a Wolseley with extra trim !!
Will be interesting to see what Bob sends me..
thanks
Simon
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Post by biggles on Sept 2, 2017 16:48:39 GMT
Bruce you were spot on - my cylinder was missing a 'cup' for the pushrod to engage with. The new one arrived yesterday and I fitted it this morning and the gearchange has been transformed.
Had a long run out to celebrate..
Bob - thanks for getting it to me so quickly - will send back the old one..
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Post by bobthescrapman on Sept 2, 2017 19:32:12 GMT
Glad to be of service. Are you coming to Standish in the 1.5?
Cheers,
Bob.
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Post by canuck on Sept 4, 2017 16:23:49 GMT
Bruce you were spot on - my cylinder was missing a 'cup' for the pushrod to engage with. The new one arrived yesterday and I fitted it this morning and the gearchange has been transformed. Had a long run out to celebrate..
A happy ending, Bravo!
I wonder where that 'frankenstein' slave cylinder you had originated? There was so much wrong, with so few components, on a simple part. 
B
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Post by biggles on Sept 4, 2017 17:44:23 GMT
Glad to be of service. Are you coming to Standish in the 1.5? Cheers, Bob. I feel I may have missed a memo..  |
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- I would double check that everything is squared up when you fit the new one.
The bore of the cylinder needs to be in good shape to do its job, and may not be rebuild able, so take a look.
the hydraulic pump, in this case the master cylinder, is sized to the actuating piston, in this case the slave cylinder. So in this case maybe size matters? 
