Home › Forum › Ask A Member › 54 Johnson RD15A top seal (still) leaks › Re: 54 Johnson RD15A top seal (still) leaks
Well, I have to admit that the operation/theory of that seal/drain system does not make sense to me, even though I understand how it is supposed to work. I guess the best set up would have been to have the oring around the bearing AND put the drain system above the oring.
In any event, doesn’t look like anyone has had that crankcase apart. Did you do the test that Mumbles showed online with the drill/socket spinning the engine with the plugs out? Be careful with the drill, the motor might spark igniting crankcase fumes. If so, did you plug off the fuel tank pressure port? I’m not sure which cylinder it is plumbed into, but left open it will make it harder to do mumbles’ test.
I would not pull that crankcase apart, remove the support and clean everything up with brake clean like others have mentioned. I doubt the crankcase spaghetti seal is bad, block could be cracked/porous though.