Winterizing (Wher's My Gear Oil Drain - Mercruiser)?

[BarryBob]

Sorry for putting this in General Forum but I'm working on the boat as I type.<br /><br />I am winterizing my 1983 120 hp I/O Mercruiser and want to change my gear drive oil but can't find a drain or hole to put it in.<br /><br />Can anyone tell me where the drain and fill hole are? Does it use engine oil from the motor?<br /><br />Thanks!<br /><br />Barry

 

[moderator1]

Re: Winterizing (Wher's My Gear Oil Drain - Mercruiser)?

Moving to I/O's.

 

[LubeDude]

Re: Winterizing (Wher's My Gear Oil Drain - Mercruiser)?

You have to remove the prop, and there it is!!!<br /><br />LudeDude

 

[denniz]

Re: Winterizing (Wher's My Gear Oil Drain - Mercruiser)?

Thats only on a Bravo,83 120 is a alpha.

 

[LubeDude]

Re: Winterizing (Wher's My Gear Oil Drain - Mercruiser)?

Boy, that was a mistake! I guess I really didnt read the post! Just figured if he couldnt find it that it must be the newer outdrive! Duh!!!

 

[kachme]

Re: Winterizing (Wher's My Gear Oil Drain - Mercruiser)?

Barry, I have a '68 120 that may have a newer lower unit. My upper unit has both a fill and a vent screw (fill is on port side). These are just below the top cap and are marked on the casting. My lower unit should have a fill and vent screw but only has the fill screw. The lower unit vent screw is on the port side, leading edge, just under the buldge for the prop gears. I think your "newer" OD will have the vent and drain/fill on the port side. <br />Hope this helps,<br />Kach