JB Weld or epoxy will work for sealing. First, grind off the crack
surface and locate the ends of the crack. Use a magnifying glass. Drill
a 1/8" hole at each end of the crack to stop it from spreading. Don't
drill past the inner surface. Spray the crack with carb cleaner to
remove the oil. Work the sealer into the crack and holes.
JR

Chris wrote:
Does anyone here know about welding a lower unit? Basically, there's a
hairline crack at the bottom that allows oil to leak out, and I want it to
be sealed up with a weld (as I don't know any other compound that would do
the job).

The motor is an early 70's Mercury 4 cylinder. I'm not sure what its all
made of, but likely a more traditional material would be the case.

Again, I'm not looking for a strength weld, but rather a sealing weld.
Maybe a bead would do the job.

Can it be done? ( I heard they can weld props, so why not this ).

Also, if you do know anything else that may work, please let me know. I
have considered JB Weld, but haven't gotten around to try that as a sealer.

Cheers

Chris





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