Re: 1967 Merc 60 (6hp) lower Unit Help

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auldscott

US Member - 2 Years
Replies: 175
Topics: 42
#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.