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Mk1 master cylinders

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66S

Post subject: Mk1 master cylinders

Posted: Mon Sep 17, 2007 2:10 pm

998cc

Joined: Wed Sep 13, 2006 7:26 am
Posts: 900
Location: Christchurch New Zealand

Hi guys,
What is the deal with Mk1 brake master cylinders? Some have an identifying ring at the base and some don't. I used to know but cannot recall right now.

Regards
Al

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drmini in aust

Post subject:

Posted: Mon Sep 17, 2007 2:22 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

The MCs with the ring around them had a different main seal (not a plain cup)- it fitted over the piston similar to the bottom seal. :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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66S

Post subject:

Posted: Mon Sep 17, 2007 2:29 pm

998cc

Joined: Wed Sep 13, 2006 7:26 am
Posts: 900
Location: Christchurch New Zealand

Hi Kev,
Thanks for that. I seem to recall there was a change date, any ideas?

Al

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drmini in aust

Post subject:

Posted: Mon Sep 17, 2007 4:42 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

Sorry, no idea- you need a dude with a parts book. Morris 1100.. where are you??? :lol:

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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Morris 1100

Post subject:

Posted: Mon Sep 17, 2007 6:33 pm

Causing or creating vexation

Joined: Wed Jul 21, 2004 10:32 pm
Posts: 19124

I have just looked through my parts books and I can't find a changover date.
I have a 69 Mini parts book (just before the change from Deluxe to K) and a last edition Morris 1100 parts book from about 72 and neither of them mentions a change.

Karcraft shows both part numbers in their catalogue but no date.
Ring = two "ring" seals. Part number BAU1247
No Ring = one "ring" and one "cup" seal. Part number 50957

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Mick

Post subject:

Posted: Mon Sep 17, 2007 7:09 pm

SooperDooperMiniCooper ExpertEngineering

Joined: Fri Apr 29, 2005 9:46 am
Posts: 18888
Location: Under the bonnet son!

Can anyone describe the 'ring' a little better? I have a number of MC's here, but the only differences I see are in the top where the brake line union screws in.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

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Anto

Post subject:

Posted: Mon Sep 17, 2007 7:12 pm

1275cc

Joined: Tue Mar 16, 2004 10:34 am
Posts: 2067
Location: Canberra

The groove varies, sometimes it is on the bottom part below the reservoir, other times it is on the reservoir itself. It is basically a groove that runs all the way around the master cylinder. Sometimes it's hard to see if the m/c is dirty.

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Timbo

Post subject:

Posted: Mon Sep 17, 2007 7:21 pm

1098cc

Joined: Mon Sep 12, 2005 11:48 pm
Posts: 1842
Location: Hobart, Tasmania

Do you have any that look like these?

Tim

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1951 Morris Commercial J Type Van
1955 BSA C11G
1961 Morris Mini Traveller
1969 Triumph TR6R
1977 Leyland Moke Californian

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Morris 1100

Post subject:

Posted: Mon Sep 17, 2007 7:27 pm

Causing or creating vexation

Joined: Wed Jul 21, 2004 10:32 pm
Posts: 19124

This should explain it better.

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Mick

Post subject:

Posted: Mon Sep 17, 2007 7:37 pm

SooperDooperMiniCooper ExpertEngineering

Joined: Fri Apr 29, 2005 9:46 am
Posts: 18888
Location: Under the bonnet son!

Sorry Timbo, none like that one I am afraid...I had a look last time you said you were hunting for them..on a bright note though, I still have a rivetted 3.5 inch rim in careful storage around the back!

I had a look through the MC's again, one has a ring around the taper down at the top of the MC. it is quite distinct having been cut in by a lathe. The bore is .75 and (obviously later down the track ) stainless steel lined.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

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Timbo

Post subject:

Posted: Mon Sep 17, 2007 9:00 pm

1098cc

Joined: Mon Sep 12, 2005 11:48 pm
Posts: 1842
Location: Hobart, Tasmania

Mick wrote:

Oops sorry, I'll get on to that this week!

Tim

_________________
1951 Morris Commercial J Type Van
1955 BSA C11G
1961 Morris Mini Traveller
1969 Triumph TR6R
1977 Leyland Moke Californian

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Mick

Post subject:

Posted: Mon Sep 17, 2007 9:01 pm

SooperDooperMiniCooper ExpertEngineering

Joined: Fri Apr 29, 2005 9:46 am
Posts: 18888
Location: Under the bonnet son!

No stress, it's doing no harm around the back.

_________________
SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

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66S

Post subject:

Posted: Tue Sep 18, 2007 9:39 am

998cc

Joined: Wed Sep 13, 2006 7:26 am
Posts: 900
Location: Christchurch New Zealand

Hi folks,
Thanks for your help, I'll keep trying to find a change date and report if I do.

Regards
Al

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