I have a 1969 Mercury 100 HP in line 6.
Last fall when I replaced the lower unit lube I noticed some fluid leaking out of a small hole in the lower unit. See arrow in photo. What does this mean? Is it an easy fix or disaster? Thanks for your help.
That weep hole is primarily for water drainage to prevent freezing but it also acts a catch point for lower unit oil which is leaking past the shift shaft seal.
Here is a picture of my engine but similiar to yours. Scroll down to item 41which is the seal housing for the shift shaft seal. The seal is inside this housing.
Thanks Gerry. So you're saying the hole is supposed to be there? and the fact that fluid is leaking out means that the seal is bad and needs to be replaced? sn is 2399810. Joe
Yes that is correct. It may only be leaking a small amount now but it is probably going to get worse, When was the last time you checked the oil level?
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