Marina/ital master cyl

[simon]

What size bore is the standard marina/ital clutch master cylinder?

[Miket]

Simon

Don't know, but the genuine Girling 0.750 master cylinder with integral fluid reservoir, or for us old enough to remember 3/4" is a direct replacement.

Cheers


Mike

[STEVE G]

Simon
Yes it is 3/4". Down side itsover £100 for new.

I have a question>. I want to convert mine to remote reservior. I've taken off the plastic reservior and found 2 holes into the cylinder.I think one each side of the seal.I intended to weld a 3/8 unf weld adaptor on, do you think I can bridge the holes so one pipe from the reservior feeds both?
Regards Steve G.

[russell_ram]

Steve,

Not so sure that welding a pair of adaptors on is such a good idea:-
i) The cylinder is cast iron, to weld it succesfully you'll probably need to pre-heat it and even then it's not the easiest job (not that I'm doubting your competence as a welder of course!).

ii) Can you guarantee not to distort the bore? If it does your brakes won't work and all the fluid will wee out past the seals or the pistons will not move freely.

iii) There is a pin in the front hole that holds in the front piston and restricts its rearward motion. You need to be able to remove it to service the seals on the front piston.

I would think that tapping the two ports and screwing in adaptors would be a better bet. You don't need to worry about depth of thread engagement because there isn't any load applied as such.

As for feeding both ports off one resevoir, I don't see why you can't technically. However the whole point of dual circuit brakes is that you still have one circuit working should you lose fluid from the other. In your one resevoir scenario you would lose both circuits at once.

Just my thoughts chap.

Russ

[STEVE G]

Russ
Bit of a mix-up on my part.
1.The clutch cyl has 2 holes very close together,one each side of the seal.These are the ones I want to link by welding and adaptor to.The cylinder is new type and turned out of steel bar.
2.I've been thinking on the same lines about not welding the adaptors to the brake cylinder.I sussed the pin out whilst removing the seals.This has been a puzzle for some days.One of the lads at work thinks he may have a 7/8 unf or 20mm tap.If so I'm sorted.I will also use two reserviors for the brakes.
3. Any idea what the thread on the front brake line port of the brake cyl. is? Its not 7/16 or 1/2 unf but a finer thread approx 1/2 by 24 tpi.cant find it in Zeus.
Regards Steve G.