Whaler Central - Boston Whaler Boat Information and Photos

Posted by Greg Mitchell on 09/03/08 - 3:48 PM

I have a 1982 Johnson 90HP 2 stroke. It seems to run great, I just bought the boat so I am still learning about the boat and engine. When I take it out of the water to clean and flush I see a little oil leak out from the lower part of the engine. Any ideas as to what could be going on? And how can I find out the weight of this engine? I also have a 1986 johnson 7.5 as a kicker, is this to much weight for my 1982 Montauk 17? Thanks for your help

Posted by Jeff on 09/03/08 - 5:50 PM

Greg,

Where is the oil leaking from? The drain plug or your the prop exhaust? To be sure you do not have a leaking seal on the lower unit pull the plug to drain a little oil out. If it is milky / creamy in color you have a leaking seal. If the oil in the lower unit is not milky or creamy then it is most likely just unburnt 2 Cycle oil draining out of the exhaust. This is a common occurrence in old 2 Cycle motors. My OMC V6, V4, and Merc inline 6 all did this. The oil is typically very black and has a metallic / acrid oder.

The weight on your old 90 I believe should be 310 lbs. Throw in around 60lbs for the kicker. You have nothing to worry about with what you have on your stern.

Edited by Jeff on 09/03/08 - 5:52 PM

Posted by Binkie on 09/03/08 - 7:56 PM

Why don`t you just drain the lower unit? It will tell you everything. If oil is leaking out, then water is leaking in. It will be a milky color. If it looks like oil, or is just dark in color, add fresh oil and forget it. The oil you see dripping out the exhaust is just unburned 2 stroke oil..
Rich

Posted by Binkie on 09/04/08 - 4:58 AM

You should still unscrew the two plugs, and drain and refill the gearcase. It is a good idea on any motor that is new to you, or as a yearly maintenance on any outboard. Gearcase repairs are costly, resealing is relatively inexpensive.

rich

Posted by CES on 09/04/08 - 5:54 AM

IS it more of a tar like substance or is it really oil? I know that when I ran some "Ring free" in my gas, the result was a discharge of a tar like substance. Also, you may be running too much oil in your gas/oil mixture and the run off is exiting from the exhaust housing.