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  • Lower main seal

    My engine is leaking oil through main drive shaft seal what does it take to replace seal?after removing lower unit I see four bolts/nuts holding retainer plate. Can retainer plate be removed from engine without messing with anything else like crankshaft timing gear on the other side of retainer plate I have condensed service data but is there a better manual out there for sale with more detail?. Looks like the best way is to remove lower cowling to gain proper access to plate. Regards, Paul

  • #2
    I had to pull the block on mine last year to fix an oil pan gasket leak. That gave very easy access to the retainer and seal you need to replace. Despite being there, I didn't change the seal as it wasn't leaking so I can't say what else you might have to deal with. I didn't remove the upper leg so don't know what type of access that would provide, but pulling the block might give you better access than trying to work from below. Essentially all you need to do is disconnect the wires from the junction terminal, the fuel line, and the water line, remove 6 bolts from the underside of the cowling and lift it straight up.
    _____________________________________
    1970 Boston Whaler Sakonnet w/ Bearcat 55
    1960 Chris Craft 18' Continental w/ 283 ci V8

    Comment


    • #3
      Originally posted by jhomeist View Post
      I had to pull the block on mine last year to fix an oil pan gasket leak. That gave very easy access to the retainer and seal you need to replace. Despite being there, I didn't change the seal as it wasn't leaking so I can't say what else you might have to deal with. I didn't remove the upper leg so don't know what type of access that would provide, but pulling the block might give you better access than trying to work from below. Essentially all you need to do is disconnect the wires from the junction terminal, the fuel line, and the water line, remove 6 bolts from the underside of the cowling and lift it straight up.
      I still have all my stuff in Storage and trying to get into my new shop down here. I do know that most anything you do, its not hard to pull the power head.
      Once my shop is back up and in order, I will get deep into the Bearcat engines again as we are loosing too many people that work on them.
      Supersporster has all the repair books, done total overhauls on them, knows were to get everything but the pump impeller.

      These engines are pretty simple to work on for the most part. Tune up parts are available at your local NAPA store still.
      I have several mods I did to mine. One a starting issue with the old stock coil. Thanks to John Nelson, I used modified my coil holding bracket, used a coil and "Matching" condenser for a 1968 ford 390. The trick is, Matching Condenser to the coil for the proper pico farads.

      I still use Points but now that Matches and match books are getting harder to find, you have to guess the point gap if no feeler gauge ;-)
      Helmar Joe Johanesen
      1959 Skagit 20ft Offshore, 1959 Skagit 16ft Skimaster,
      1961 17ft Dorsett Catalina.1958 Uniflite 17 ft
      Outboards: 2.5 Bearcats, 3 50hp White shadow Mercs
      2 40hp Johnsons, several smaller Old kickers for a total of 12

      Our Sister club
      http://www.goldenstateglassics.com

      Oh, and Where is Robin Hood when you need him??

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      • #4
        Hi Joe having a little hard time on the retainer plate in front of seal at end of crankshaft got the motor out as suggested easy to work on but things seem to be stuck in place pretty good I have four screws removed and working a exact blade in between plate and housing soaking in Kroil right now maybe that will free it up any suggestions. Paul

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        • #5
          Thanks for the help Jhome, that was alot easier I had 8 bolts 4 on the side 4 underneth. Paul
          Last edited by frogpond; 04-28-2016, 12:37 PM.

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          • #6
            Been a while since I've had one apart but if my memory is correct there is a spring under the retainer plate and the plate is under pressure. I've got a couple powerheads in the garage and can refresh my memory this weekend with pictures.
            Dick Johnson
            1989 16ft Sylvan
            '57 Evinrude 18hp
            '58 Johnson 5.5hp
            '61 Johnson 5.5hp LS
            '64 Johnson 18hp
            '72 Johnson 6hp
            '61 Homelite 55 Shortshaft
            '65 Homelite 55
            '66 Homelite
            '68 Bearcat 55 (3)
            '70 Bearcat 55 (2)

            Comment


            • #7
              Hi Dick there is a spring (25) looks like in front of oil pump gear so looks like retainer plate is just stuck with gasket sealer or old age. So this is under tension strange it's so stuck maybe I need to tap it a little. My next plan was to get on backside of plate with flat side of bolt head and use a slide hammer any suggestions?.
              Last edited by frogpond; 04-29-2016, 09:33 AM.

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              • #8
                Okay I was mistaken, retainer is not under spring pressure. Must have been thinking of the oil pump gear. I took this off just by tapping on it after removing the screws.

                IMG_0538.JPG

                IMG_0537.JPG

                IMG_0535.JPG
                Dick Johnson
                1989 16ft Sylvan
                '57 Evinrude 18hp
                '58 Johnson 5.5hp
                '61 Johnson 5.5hp LS
                '64 Johnson 18hp
                '72 Johnson 6hp
                '61 Homelite 55 Shortshaft
                '65 Homelite 55
                '66 Homelite
                '68 Bearcat 55 (3)
                '70 Bearcat 55 (2)

                Comment


                • #9
                  Tapping in, ? to rock it a little, could you possibly give me a seal number going to Mcquire bearing here in Tacoma to pick up a spedi sleeve to repair worn coupler seal surface. Was actually thinking of posting about this. Paul

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                  • #10
                    I've never replaced the seal, I do have an interchange showing a National Seal #472475 and a CR #11763 Take the retainer and coupler with you, they can mic them and find a replacement.

                    Yes I just tapped on it and it loosened up, there is also an o-ring on the retainer.
                    Dick Johnson
                    1989 16ft Sylvan
                    '57 Evinrude 18hp
                    '58 Johnson 5.5hp
                    '61 Johnson 5.5hp LS
                    '64 Johnson 18hp
                    '72 Johnson 6hp
                    '61 Homelite 55 Shortshaft
                    '65 Homelite 55
                    '66 Homelite
                    '68 Bearcat 55 (3)
                    '70 Bearcat 55 (2)

                    Comment


                    • #11
                      Thanks Dick I'll let everyone know of my progress. Paul

                      Comment


                      • #12
                        Super Sportster, I sent you a PM regarding the manuals Helmar indicated you have. Thanks, Jon
                        _____________________________________
                        1970 Boston Whaler Sakonnet w/ Bearcat 55
                        1960 Chris Craft 18' Continental w/ 283 ci V8

                        Comment


                        • #13
                          Originally posted by jhomeist View Post
                          Super Sportster, I sent you a PM regarding the manuals Helmar indicated you have. Thanks, Jon
                          Jon,
                          Email sent,did you get it?
                          Dick Johnson
                          1989 16ft Sylvan
                          '57 Evinrude 18hp
                          '58 Johnson 5.5hp
                          '61 Johnson 5.5hp LS
                          '64 Johnson 18hp
                          '72 Johnson 6hp
                          '61 Homelite 55 Shortshaft
                          '65 Homelite 55
                          '66 Homelite
                          '68 Bearcat 55 (3)
                          '70 Bearcat 55 (2)

                          Comment


                          • #14
                            Originally posted by Super Sportster View Post
                            Jon,
                            Email sent,did you get it?
                            Sure did, many thanks Dick!
                            _____________________________________
                            1970 Boston Whaler Sakonnet w/ Bearcat 55
                            1960 Chris Craft 18' Continental w/ 283 ci V8

                            Comment

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