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  1. #11
    Join Date
    Feb 2011
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    Quote Originally Posted by mylesdw View Post
    I reckon you're right - a non-issue.

    Just the threads differ, it's all 3/16" pipe but the ports are 7/16 and 3/8" (UNF).
    I can't imagine why a vehicle manufacturer would go to the trouble of having a cylinder machined with two different threads (therefore, at the time, likely two different operations on two different machines meaning handling between machines) unless they really didn't want you to mix those pipes up (and by you I mean the on-strike-half-the-time bloke on the assembly line working through rolling blackouts .. Marina was the 70s, right? ) - perhaps the master cylinder is a stepped bore cylinder (which I think is fairly common, actually, among middle-aged cars to provide the bias front/rear, with newer cars using proportioning valves)?

    Just a thought, I haven't seen a Marina master cylinder in at least 20 years at this point .. oh, god.. 24 years.
    My DeDion build diary..
    Hon Sec of the Digidash branch of the Unpopular Kit Car Design club

  2. #12
    Join Date
    May 2004
    Location
    Cowbridge, United Kingdom
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    9,946
    Ha Ha! Red Robbo and his gang at British Leyland.
    I'm sure that Ford was no better at the time.
    I agree the different threads would be to aid correct mass assembly by "monkeys".
    No offence to anyone I was one once myself.
    Kev Davies
    South Wales Area Rep. UKCC Membership Secretary
    DAX Mk4, 383 Chevy Stroker, Tremec. SOLD
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    In build- Hawk 289 Sebring

  3. #13
    Join Date
    Feb 2011
    Location
    Northampton
    Age
    41
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    4,054
    Likewise, no offence meant in my post either

    If anyone has a spare Marina master cylinder knocking about .. I'd be tempted to dismantle it just to see, now, if it has a stepped bore or not! The seal repair kit pictures imply not, to be fair, as they look like the same size seals. So maybe it really was just to stop Terry* from trying to stretch the wrong pipe to the wrong hole..

    *Names changed to protect the innocent, etc.
    My DeDion build diary..
    Hon Sec of the Digidash branch of the Unpopular Kit Car Design club

  4. #14
    Join Date
    Aug 2004
    Location
    Christchurch, NZ
    Age
    59
    Posts
    2,340
    I don't *think* it is stepped, but it is 32 years since I rebuild mine.
    Cheers

    Myles D-W

  5. #15
    Join Date
    Apr 2004
    Location
    East Leake, Nottinghamshire, England.
    Age
    55
    Posts
    9,521
    Quote Originally Posted by aaronjb View Post
    Likewise, no offence meant in my post either

    If anyone has a spare Marina master cylinder knocking about .. I'd be tempted to dismantle it just to see, now, if it has a stepped bore or not! The seal repair kit pictures imply not, to be fair, as they look like the same size seals. So maybe it really was just to stop Terry* from trying to stretch the wrong pipe to the wrong hole..

    *Names changed to protect the innocent, etc.
    When I rebuilt my Marina master cylinder it was all the same size bore in the master cylinder.

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