Douglas SV54

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  • April 15, 2025 at 2:48 pm #43623
    will
    Participant

    Good afternoon everyone,

    Might anyone be able to provide tappet clearances for the Douglas SV54 engine?

    Thank you
    Will

    April 17, 2025 at 7:59 pm #43626
    will
    Participant

    In the end I used 10 thou inlet and 16 thou exhaust (not sure why 16 exactly!). With a hone and new rings it now has huge compression and runs beautifully

    April 18, 2025 at 8:54 am #43627
    sidevalve5
    Participant

    Hi Will,

    Did not see your posts until this morning. I set the tappet clearances on a Jap 5 & 6 to 10 thou on the inlet and 20 thou on the exhaust. These figures are stamped on the inside of the inspection cover. Have also fitted new rings if required and can vouch for the increase in compression when this is done. Have two Douglas SV54 engines that I got when I purchased a couple of Trusty’s that were taken apart so that they could be stored. Intend to reassemble the machines one day and will make sure the engines perform well. If they need new rings, I will fit them. Out of interest, where did you get the rings from.

    Best wishes,

    Grahame

    April 18, 2025 at 9:18 am #43628
    andyfrost
    Participant

    Grahame , Cox and Turner should be able to help you with SV54 rings.

    Andy.

    April 18, 2025 at 4:25 pm #43635
    trusty-bloke
    Participant

    PM me you e-mail and I’ll send a pdf of the 2No. SV54 manuals that I have ..

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