1960 Lark Impeller Housing Dilema

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  • May 7, 2020 at 2:51 pm #202383
    Ken Smith
    Participant

      Canada Member

      Working on my ’60 Lark 40 HP . The impeller housing is damaged at the driveshaft seal housing. I think I have some options. One being buy a new one but at $ 100 + I’m ruling that one out
      Can I;
      1 Install a new seal #321459 and hope for the best

      2 Is there anyway to convert it to a single tube housing(of which I have many) and if so which tube would be capped, removed?

      I hope I’ve explained it properly. Any suggestions would be great . Thanks and Hope Everyone is healthy and safe. Ken

      001

      www.kenadianoutboards.com

      • This topic was modified 5 years, 1 month ago by Mumbles.
      May 7, 2020 at 3:35 pm #202395
      frankr
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        US MEMBER PAY BY CHECK

        I see a couple of used housings on e-bay for $30 and less. Search for 381576

        • This reply was modified 5 years, 1 month ago by frankr.
        May 7, 2020 at 3:59 pm #202402
        Ken Smith
        Participant

          Canada Member

          Hi Frank
          OK I’ve got 3 part numbers for what looks like the same part.
          305095 which is the original one I have. It comes up as NLA
          378348 which on marineengine.com shows as the correct part for a ’60 Lark on their website
          and 381576 which comes up for a ’68 to ’70 40 HP and yes there are some cheap ones on ebay.

          My question I guess is….Will the 381576 fit? I’m pretty sure it will and I like the prices. What do you think? Thanks Ken

          www.kenadianoutboards.com

          May 7, 2020 at 4:59 pm #202405
          fleetwin
          Participant

            US Member

            OK, not as versed on these 40hps as Frank…But, I know that the pump changed a bit in the late 60s. The 378348 housing is listed for the 1960 40hp and doesn’t supercede, according to Marineengine.com The 1969 40hp uses the 381576 housing, which has the extra water tube that attaches to the end cap where the other two water tubes connect…
            Now it is certainly possible that these two part numbers are for the same housing, perhaps one is a “kit” or something like that. The original cap gasket from the 1960 model supercedes to the gasket used in 1969. What do you think Frank?
            In any event, I did see a few reasonably priced 378348 caps on ebay also…

            • This reply was modified 5 years, 1 month ago by fleetwin. Reason: correction
            May 7, 2020 at 6:14 pm #202413
            frankr
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              US MEMBER PAY BY CHECK

              OK guys, here is what I believe to be true, at risk of being made into a monkey. I believe all the 35-40 hp motors with dual water tubes used the same pump housing. Confusion comes with what was included, All came with a seal, but not all included the cap. The cap got changes in the late 1960’s due to different water inlets, but the pump housing itself stayed the same.

              Crunching some part numbers—–

              1959–377533 housing, no cap or seal–superseded by 378348 with cap & seal.

              1961–378354 housing with seal, but no cap–superseded by 381576

              1965–378593 housing with seal, but no cap–superseded by 381576

              1968–381576 housing with seal, but no cap

              Not fully sure, but the change to 381576 MIGHT have due to enlarged hole for the electric shift wire to pass through

              That’s my story.

              May 7, 2020 at 7:23 pm #202426
              fleetwin
              Participant

                US Member

                Makes sense Frank….The 378348 is for a cap, housing, and seal….Saw a picture of it on marineengine.com I would agree, the actual impeller housing itself didn’t really change over the years, just the end cap.

                May 7, 2020 at 7:39 pm #202429
                dave-bernard
                Participant

                  US Member

                  I would be willing to bet that if you used the original one and added a slinger on the drive shaft it would work fine. mercury did away with the seal in the top of there pumps.

                  May 7, 2020 at 7:56 pm #202430
                  frankr
                  Participant

                    US MEMBER PAY BY CHECK

                    Careful what you bet on, Dave. That OMC drive shaft runs in an isolation tube. The isolation tube must be sealed top to bottom to keep exhaust gasses from entering the cowling and smothering the motor. The seal in the pump housing keeps the isolation tube from being overwhelmed by water.

                    May 7, 2020 at 11:04 pm #202455
                    dave-bernard
                    Participant

                      US Member

                      much more complicated than merc’s

                      May 8, 2020 at 10:19 am #202492
                      Ken Smith
                      Participant

                        Canada Member

                        Thanks for the information Guys. I wound up going with a 378348 housing off Ebay. It comes with the plate(which is another story) and the seller states its off a 1960 Lark II 40 HP same as mine. Good price too. (except for the exchange from CAD!) Anyway thanks again ! Ken

                        www.kenadianoutboards.com

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