Oil leak? '75 Evinrude 25HP

jugdish

Cadet
Joined
Jul 3, 2005
Messages
10
After leaving the motor in the 'tank' for a couple of days, an oil film developed on the water surface. There is a hole on the starboard side of the lower unit (just to the left of the fill plug for the gear case) which is oozing dark gray oil/grease.<br /><br />What is this hole for? Any ideas why it's leaking and/or how to fix it? Could water be getting into the gear case and causing the oil/grease to overflow thru this hole?<br /><br />Please advise.
 

G DANE

Commander
Joined
Nov 24, 2001
Messages
2,476
Re: Oil leak? '75 Evinrude 25HP

This hole drains the midsection for unburned 2stroke oil, and cooling water when tilted up.. When motor iddles or runs without oil, it is not able to burn all the oil in gas. Perfectly normal.
 

jugdish

Cadet
Joined
Jul 3, 2005
Messages
10
Re: Oil leak? '75 Evinrude 25HP

Thanks! I had just rebuilt the carb and replaced coils, etc. and got it running (without missing) again. I was a little worried I had another problem to solve.
 

river rogue

Recruit
Joined
Aug 17, 2005
Messages
2
Re: Oil leak? '75 Evinrude 25HP

Originally posted by jugdish:<br /> Thanks! I had just rebuilt the carb and replaced coils, etc. and got it running (without missing) again. I was a little worried I had another problem to solve.
 

river rogue

Recruit
Joined
Aug 17, 2005
Messages
2
Re: Oil leak? '75 Evinrude 25HP

I had black oil dripping slowly from the hole you mentioned that I hadn't had before. Repair shop said I must have a bad seal in gearcase
 
Top