Reply To: Mercury KG7Q

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May 5, 2026 at 9:28 am #317618
Aidan Smith
Participant

    US Member

    Unfortunately, I believe my crank seals are gone.

    When I pulled the mag plate, there was a fine oil slick across the bottom of the rotor.

    I also had it running great in the test tank for about 30 minutes, then it suddenly started backfiring, and couldn’t be resolved by adjusting the carb or timing.

    I’m thinking I will go through the motor before the summer, replace all gaskets and both crank seals.

    If anyone has any other recommendations or advice, it would be greatly appreciated.

     

    Thank you,

    1952 Blue Streak "B-Stock Runabout" - 1952 Mercury KG7Q
    1955 Feather Craft Vagabond - 1956 Mercury Mark 55E