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  1. #1
    Member
    Join Date
    Jun 2004
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    Bentonia, MS 39040
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    3,358

    Changing rail diaphrams

    Mine are all original and gonna replace all three, has anyone got the cups, I need the air and fuel spring cups, sure they are worn, thanks Ron
    Ron Fears
    Stroker/300XS
    1E003823

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
    Join Date
    Apr 2008
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    Greenville, SC (US)
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    95,315
    #2
    Ron... WHY are you replacing these? Many of the original diaphragms are actually better quality, IMHO.

    Spring cups should last several thousand hours under normal conditions. I've replaced less of them than I have fingers on one hand (and I work on rails every day). A dab of 2-4-C on the end of the adjustment screw helps to keep the cup happy.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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  3. Member
    Join Date
    Jun 2004
    Location
    Bentonia, MS 39040
    Posts
    3,358
    #3
    Well I have new purple ones, gonna at least check them all and look at cups. It is two lbs low, 14lb spread. So I thought I would look over and change if needed.....
    Ron Fears
    Stroker/300XS
    1E003823