do i need to replace seals on lower unit?

[spacerust]

i have a 73 johnson 135hp. i recently changed the oil on it a couple of weeks ago. i have noticed a little bit of oil from behind the prop after a day out but am thinking it may be unburned oil. but today i noticed that there was so oil leaking from one of the vents on the starboard side. it seemed quite a bit. no mix-just looks like the oil when i put it in throught the bottom. so i take off the vent screw to inspect the oil and when i remove the bottom screw some water came out first. maybe about a second or so and then oil. it didn't look milky like it was mixed in with the oil. any suggestions?

 

[Vic.S]

Re: do i need to replace seals on lower unit?

Read http://forums.iboats.com/showthread.php?t=207285

Black gungy oil is almost ceratinly partly burnt oil from the fuel and is normal.

Oil that is clean and obviously gear oil = a leaking seal, O ring or gasket in the gearcase.
water in the gear case may just be the result of reusing the old seals on the level/filler plugs but otherwise is due to a leaking seal etc.