Johnson HD-25 "outboard or anchor?"

[Buccaneer]

Oltimer, did you machine the bottom crankcase hole
with a square plunge, or machine a "half round"
groove for the O-ring to fit in? I’d have to look again,
but I don’t think the bottom drain cap would keep
the o-ring in place, as I think the hole is too big.
What’s the thought with an o-ring just on the
bottom, and not the top of the crankcase?
Thanks!

Prepare to be boarded!

[oltimer]

I did it in the bottom of the crankcase casing, with both half’s bolted together, and ground down a half round bit for the cutting. The o-ring is far superior. Any machinist can do this for you, but as he will tell you; most of the time is taken in set up time and jig. Making the slot for the o-ring takes the least time.

[Author]

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