gear oil leaking from water intake

[cjwess]

I have a 93 johnson 8hp 2 stroke outboard and am leaking gear oil out of the water intake screen. I know it is gear oil because I drained it and found water inside. I attached a link with the diagram for my gearcase. The oil is leaking from part# 24, any ideas on what may be causing the leak.

http://www.boats.net/parts/search/BRP/JOHNSON/1993/J8RETB/GEARCASE/parts.html

 

[cjwess]

gear case diagram

 

[oldboat1]

Where on this diagram: http://www.iboats.com/Gearcase/dm/cart_id.935043584--session_id.243357546--view_id.1536674 ?

leaking driveshaft seal, maybe?

 

[cjwess]

part number 24

 

[oldboat1]

not the source of the leak, though. I would pressure test the gearcase and see if I could locate the leak. Need a small pump (hand or foot pump) -- I use an inflation needle and a piece of gasket material. Insert and hold the needle in the vent or drain hole, drained gearcase immersed in a tub. Look for bubbles. Low pressure -- maybe 6 or 8 lbs.

 

[racerone]

Major leak point is the shift rod o-ring.----There is room for 2 of them so I install 2.

 

[boobie]

Sometimes it takes 12 to 14 psi to find the leak.

 

[oldboat1]

fair enough. Just don't blow out seals with your compressor. Should add that the l.u. needs to be removed before dunking -- maybe obvious, but wasn't said.

 

[cjwess]

Air is coming out from part# 57, I think you may be right that it is the driveshaft seal. Does that seem right?

 

[oldboat1]

Think that's likely. Remove the water pump assembly and pressure test again. I use either the drain or vent hole to pressurize -- inflation needle through a piece of rubber gasket (hold in place with your finger).