Clutch master cyl option?

[Galileo]

I did a bit of research on the LR part number 90569126 and could not find anything to say the series 2 used the .625 bore, and that includes looking at old part guides and cross reference stuff.

[James467]

It was more of a case of I remember taking a master cylinder off of the Series 2 and it looked the same as a dolly and someone telling me that they were.

At lease we have cleared that one up!

[Galileo]

Ah, sorry James, that was a rushed lunchtime post and I didn't make the point I really intended!

I was trying to that I'm a little confused by this, for one thing I doubt that a .625 bore with 7/16" master cylinder was unique to the Sprint but anyway, though I looked I could not find a definitive source that said what a series 2 LR master cylinder should be, only people selling replacements that could fit a Series 2 and 2a. Example is TRW who list PMD350 as a cross match for 90569126:

LAND ROVER 569126
LAND ROVER 90569126
LAND ROVER GMC310
ROVER GMC310
ROVER 905691126
ROVER 569126
ROVER 274841

LAND ROVER
MODEL MODEL YEAR FROM MODEL YEAR TO PART FITTED YEAR FROM PART FITTED YEAR TO KW HP
LAND ROVER 88/109 (LR_) 2.3 4x4 (LR 88 OL, LR 109 OL) 09/63 12/86 09/63 12/86 51 69
LAND ROVER 88/109 (LR_) 2.3 D 4x4 (LR 88 DL, LR 109 DL) 09/63 12/86 09/63 12/86 46 63
LAND ROVER 88/109 Hardtop (LR_) 2.3 4x4 (LR 88 OP, LR 109 OP) 09/63 12/86 09/63 12/86 51 69
LAND ROVER 88/109 Hardtop (LR_) 2.3 D 4x4 (LR 88 DP, LR 109 DP) 09/63 12/86 09/63 12/86 46 63

Even registered with TRW for a login but nothing states the outlet size, but it does state that the bore is 19.05mm, which is a 0.75" bore. So I tried going through Land Rovers from 1961 and all .75" so gave up on that. Checked other suppliers of the same part numbers and all state 3/8" outlet.

That only says to me that the aftermarket LR replacements might not have the right outlet size. As the slaves are usually still 7/16" does that sort of suggest that clutch master cylinders are now all just actually brake master cylinders?

I do wonder about using a new one with a 3/8 to 7/16" adaptor, as the point of 7/16" pipework is supposed to be less resistance and I've just introduced a reduced diameter. I know that the pressure does not alter on pipe diameter, but I'm of the understanding that a larger bore is used in clutch hydraulics due to the speed of clutch pedal travel and so fluid transfer causing a resistance and therefore dampener effect that would not be apparent in a brake circuit. Guess I'll find out when I fit mine, and I can always get it drilled and tapped to 7/16" if all else fails!

[xvivalve]

Stainless sleeved clutch master cylinders, the remote reservoir type, are now in stock. £87.50 each incl postage to UK address on exchange basis

[tonybsa]

Apologies for not checking this thread,before now.
The number I posted was the e bay item number NOT the part number,after further investigation,I am not so sure the seller hasnt just used a handy britpart box to put the cylinder in.
But I assure you its new,has 5/8 bore,and 2 x 7/16 UNF outlets,cost £39,plus post. E bay item no 311750566097 or Classic parts tel 01206230961.
Hope this helps.