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Recent content by dh_user

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    1973 Johnson 50 with “Powershift” piston assisted shifting

    Update; after a good long time, I got the gear case back from the machine shop. He did really good work, and the gear shift rod/piston assembly fits now. Here are a couple of photos. (I also asked him to dig out the broken 1/4-20 bolts from the old gear case, so I’ll have that one too.) Big...
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    1973 Johnson 50 with “Powershift” piston assisted shifting

    I took the new gear case to a good machine shop, to have the cylinder cavity milled out a little wider. Will post photos when I get it back.
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    1973 Johnson 50 with “Powershift” piston assisted shifting

    I've installed the oil pump, forward gear/thrust bearing/washer, plus the drive shaft/pinion/nut... and fit seems correct. The hole in the oil pump (facing up the gearcase) that accommodates the bottom end of the shift-rod (from the assist cylinder) is linked up correctly. The bottom of the...
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    1973 Johnson 50 with “Powershift” piston assisted shifting

    I broke off 2 bolts (that hold the the driveshaft bearing housing) inside the old gearcase. 2 local machine shops looked at it and passed on the extraction project. Hey - love this idea to switch out the gear case to a newer platform... you have a lot more experience here than I do... what do...
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    1973 Johnson 50 with “Powershift” piston assisted shifting

    CORRECTION: I can no longer edit/correct my initial post - so I'm correcting one thing here: The NOS gear case I thought I got from marine engine - I actually got from pine lake parts on ebay. It was sold as OMC part 385560, which is shown as superseded part 393752 on me.com (and both those...
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    1973 Johnson 50 with “Powershift” piston assisted shifting

    And the old one:
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    1973 Johnson 50 with “Powershift” piston assisted shifting

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    1973 Johnson 50 with “Powershift” piston assisted shifting

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    1973 Johnson 50 with “Powershift” piston assisted shifting

    Racer one, if I got tired of messing with this, what would it take to use the same NOS gear case and convert the shifting mechanism to mechanical? (I'm somewhat committed to this gearcase, as all 11 lower pieces are primed/painted/clear coated.) My first guess is to: - replace the prop shaft...
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    1973 Johnson 50 with “Powershift” piston assisted shifting

    Thanks recerone; appreciate your experience. I’ll call marine engine today and talk through it with them. Posting photos in a few minutes.
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    1973 Johnson 50 with “Powershift” piston assisted shifting

    Thanks Droid … I’ve experienced that too. Other than this cavity for the shift assist cylinder, the NOS gear case seems to match. I ordered it by the OMC part number from marine engine, but the old and new ones are definitely different in that one respect. I’ll post photos in a few minutes...
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    1973 Johnson 50 with “Powershift” piston assisted shifting

    Hi all - I have a 1973 Johnson 50hp, model 50ESL73R. The shift rod design is 2 sections: an upper shift rod that goes up through the exhaust housing and connects to the linkage on the power head just like nearly all shift rods do; and a lower section with a cylinder/piston/valve that lives...
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    1973 Johnson 50: gearcase oil pump assembly

    No kidding! That was my favorite. For anyone out there with a similar issue, here’s what I got on another board; this info plus “just one more parts order” will solve it.
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    1973 Johnson 50: gearcase oil pump assembly

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    1973 Johnson 50: gearcase oil pump assembly

    Hi all, here’s my engine… 1973 Johnson 50hp, long shaft, electric start Manual shift with hydraulic shift assist pump (as far as I can tell) As I disassembled the gearcase, I was expecting to find some detent springs and balls, but there’s weren’t any in there. I don’t really trust what was...
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