Home › Forum › Ask A Member › 54 Johnson RD15A top seal (still) leaks › Re: 54 Johnson RD15A top seal (still) leaks
September 22, 2015 at 10:24 am
#24375
I like Frank’s idea about removing the carbon seal/spring/cup and finding a seal that will fit above the bearing, tight into the crankcase halves. The problem would be finding such a seal, you would have to measure the ID of the crankcase bore and the OD of the crankshaft. You would have to be careful not to plug up the vertical drain slot for the vacuum recirc to the intake manifold though.
But first, I would try a new carbon seal/oring, and make sure the cup and spring are the correct pieces.