Lower unit oil

jls02

Cadet
Joined
Jun 6, 2004
Messages
18
I have a 90hp yamaha 1988 2 stroke and I want to add lower unit oil. There are 2 plugs one is labeled oil level and the other is wash. They are right accross from one another. One is not higher than the other. How do I add lube? In which plug and is the motor supposed to be trimed up or down? Thanks<br /><br />Jon
 

roscoe

Supreme Mariner
Joined
Oct 30, 2002
Messages
21,862
Re: Lower unit oil

There should be 2 plugs, the one you found labeled "oil level."<br />And another one that looks the same but is approx 4" lower, It should be about 2" below the centerline of the propeller, possibly labeled "drain" or "fill".<br /><br />EDIT: Disregard the following for your motor, it does not apply. (If there is another screw/plug near the front of the lower unit, at about the same height as the prop center, do not remove it.)<br /><br />The motor should be vertical, not trimmed up.<br /><br />The procedure is to remove the bottom plug, then remove the top plug, allow oil to drain.<br /><br />Insert oil tube or pump into the bottom hole.<br />Squeeze the oil in, or pump it in if using a pump, until it starts to flow out of the top hole. It is now full.<br /><br />Replace the top plug, using a new washer/gasket/o-ring.<br /><br />Remove the oil tube/pump from the bottom hole and quickly replace the bottom plug, again using a new washer/gasket.<br /><br />It helps to have 3 hands to do this. :) <br /><br />If the old oil is creamy colored, you have a leak in the lower <br />unit and water is getting inside. Hopefully the new gaskets on the plugs will take care of it. Check the oil for water after your next trip to the lake.
 

jls02

Cadet
Joined
Jun 6, 2004
Messages
18
Re: Lower unit oil

I have 2 holes one is "oil level" the other is "wash" Ther are about 3 inches apart but at the same level I have no other holes on the lower unit.<br /><br />jon
 
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