Home Forum Ask A Member MERCURY MARK 55 LOWER CRANKSHAFT SEAL

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  • #184775
    dave-bernard
    Participant

      US Member

      That oil also lubes the drive shaft /crank shaft coupling.

      #185424
      jrm80
      Participant

        SEEMS LIKE IT NEVER ENDS SOMETIMES. AFTER THE RESPONSES I GOT FROM EVERYONE, I THOUGHT I HAD A PRETTY GOOD UNDERSTANDING OF WHAT THE TINY HOLE WAS ALL ABOUT, SO I WENT AHEAD AND REMOVED THE LOWER END CAP AND PULLED THE BEARING. I AM ATTACHING PHOTOS OF WHAT I FOUND. CONTRARY TO WHAT I REPORTED EARLIER, THERE ARE IN FACT TWO SEALS IN THIS ENGINE. THE FIRST SEAL (THE ONE ON THE ENGINE SIDE) HAD THE TINY HOLE AS EXPECTED. I REMOVED IT AND FOUND THE OTHER SEAL (ON THE DRIVESHAFT SIDE) UNDERNEATH. TROUBLE IS, IT HAS THE TINY HOLE ALSO. THAT BEING THE CASE, I CAN ONLY ASSUME THAT SOMEBODY HAS ALREADY BEEN HERE BEFORE AND INCORRECTLY REPLACED THE SEALS. I DO NOT BELIEVE THE SECOND SEAL SHOULD HAVE THE HOLE, AND I PLAN TO REASSEMBLE WITH A SEAL ON THE DRIVESHAFT SIDE HAVING NO HOLE. PLEASE LET ME KNOW IF THERE IS ANY DISAGREEMENT ON THIS.

        BY WAY OF EXPLAINATION ABOUT MY INITIAL REPORT OF THIS ENGINE HAVING ONLY ONE SEAL, THIS IS ONLY MY SECOND GO-AROUND WITH THESE ENGINES. MY FIRST ENGINE, AN EARLIER VERSION NO DOUBT, HAD ONLY ONE SEAL, AND MY PARTS BOOK ONLY SHOWED ONE SEAL. I ASSUMED INCORRECTLY THAT THIS ONE ALSO. HAD ONE SEAL. MY APOLOGIES FOR THE CONFUSION. AT ANY RATE, THANKS TO ALL FOR THE ASSISTANCE, AND IF ANYONE HAS ANY ADDITIONAL THOUGHTS, I WOULD SURE LIKE TO HEAR THEM.

        #185427
        dave-bernard
        Participant

          US Member

          both seals lips face down.
          first seal going in No hole
          second seal has hole
          seal with hole is next to the crank throw.
          1 914 310 7086.

          #185485
          jrm80
          Participant

            WHEN YOU SAY THE LIPS SHOULD FACE DOWN, DO YOU MEAN THE WAY THEY ARE SHOWN IN THE PHOTOS? THAT SEEMS BACKWARDS TO ME. SHOULDN’T THEY BE FACING THE OTHER WAY SO CRANKCASE PRESSURE FORCES THE SEAL TIGHTER RATHER THAN LOOSER ON THE CRANKSHAFT?

            #185489
            dave-bernard
            Participant

              US Member

              the photo is correct the seals also keep the water OUT.
              NOTE the top crank shaft seal also faces down if you do that one later.

              #185558
              jrm80
              Participant

                OK, MANY THANKS.

              Viewing 6 posts - 11 through 16 (of 16 total)
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