Holes on lower unit of Merc Black Max 150 '87

brazman

New Member
Joined
Mar 22, 2014
Location
Lufkin TX USA
#1
Hey fellas, a friend came over to look at some stuff on my new to me boat, give me some tips and pointers about boat ownership and maintenance. He was telling me about checking the lower unit gear box for water and how the oil was doing, and saw that there was a hole in the lower unit on both sides, between the upper and lower oil screws, and he had no idea what those holes are for. Thought I'd ask my new best friends/boating experts. What's with these holes?