Water in Oil Johnson 50HP Model 50 ESL75B

[Steve the greek]

Hi Guys
I thought I would do a oil change on the old girl today.
​As I removed the bottom plug this white milky oil started to pour out.
Ok water in the oil.
Question where should I start to discover problem ???
maybe prop shaft and seal ???
​Your advice would be greatly appreciated
​Thanks Steve
​Australia

 

[racerone]

You can pressure test to find the leak.----But if orininal the seals are likely all due for replacement.-----Get a kit.-----Watch some U-tube video to see how to install the seals.-----Not that hard to do.

 

[Joe Reeves]

********************
(Checking Gearcase For Leaks)
(J.Reeves)

Remove the large slotted drain/fill screw from the bottom of the gearcase and also the identical looking screw that will be located up near the cavitation plate in order to drain the gearlube.

After all of the lubricant has drained, install one of the slotted screws, whichever your preference might be.

Apply 7 to 12 pounds of air pressure to the open screw hole. Use a piece of rubber fuel line or something to create a tight air hose fit if you do not have a proper fitting.

If a leak exists, that pressure should allow you to locate the leak by sound and/or sight.

 

[oldboat1]

I do the test with the l.u. in a tub of water (unit removed from motor). An inflation needle works well with a piece of fuel hose or gasket material -- don't need much air. Look for bubbles to locate leaks.