1974 merc 200 20 hp gearoil change

johnnycrab

Cadet
Joined
Jul 19, 2010
Messages
29
I just got a 74 merc. 20 hp and I'm changing lower unit oil. it has the lower drain plug but the upper plug says flush not vent.there is a small screw about a inch back from flush plug is that the vent? and what is the flush for? thanks much John
 

Coloradolakeboy

Petty Officer 2nd Class
Joined
Jun 21, 2010
Messages
197
Re: 1974 merc 200 20 hp gearoil change

John, take a look at the sticky's at the top of the first page, your manual may be available to see online.
 
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