Reply To: MERCURY MARK 55 LOWER CRANKSHAFT SEAL

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October 6, 2019 at 12:30 am #184696
DAVID
Participant

    US Member

    like I said IF you don’t use the seal with the hole the lower of the 2 seals will burn.. no lube . then you will be using 1 seal. on later motors the puddle between the seals is sent thru the external hoses to lube the top bearing and center main.. just a side note.
    Bolt that nice Mark 55 ON I have seen them come off.