Re: 1967 Merc 60 (6hp) lower Unit Help
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April 20, 2018 at 1:49 am
#74355
Drill and tap for a Helicoil of the right size for your vent screw, or drill and tap the next size up (which will not look factory).
Full disclosure: I have not done either on a lower unit, but have done both on other castings.
If you do either of those, be most careful to clean out all metal chips and shavings. They could do damage if left in the lower unit.