Water in Lower Unit Oil 1975 85HP

[75GlastronMN]

I am getting water in my lower unit oil and assume it needs some new seals? Where are these seals located? Does anyone konw where I can get some schematics of the lower unit?<br />This is a 1975 85HP 4cyl.<br /><br />Thanks

 

[sangerwaker]

Re: Water in Lower Unit Oil 1975 85HP

Welcome to iboats!<br /><br />go to mercurypartsexpress.com for a schematic. You will need the serial # for your motor.<br /><br />Before you just start throwing seals at your lower unit, check which seal(s) are bad. Easiest way is to drop the l/u and fabricate an inflator. Use a new valve stem (couple bucks) and trim the end to fit tightly into either the fill or vent hole. Use a hand pump and inflate the l/u to 10 psi. DO NOT OVERINFLATE. Spray the lower unit down with soapy water and voilla, you'll find your leak.<br /><br />Where you at in MN?

 

[75GlastronMN]

Re: Water in Lower Unit Oil 1975 85HP

I will try that once it gets a little warmer out here. Orat least until the ground hardens a little so I can pull it out. I noticed it last fall when I drained all the oil out.<br />I am in St. Paul, near Indian Mounds Park.<br /><br />Thanks for the link!