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PostPosted: Mon Sep 05, 2011 6:21 pm 
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Joined: Sun Aug 16, 2009 12:00 pm
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Location: Atascocita
I just changed mine and it came out dark blue/green (Mercury high performace gear oil) with some streaks of bluish "creme" in it. I know the creme is water so I figured I had a seal leak.

I did a vacuum test with my mity-vac break line pump and the lower unit held (25 in-Hg) vacuum for over 2 hours. I spun the prop over by hand at 1 hour just to see and the pressure didn't move.

Good nuf? I hear of people doing a positive pressure test as well to see if it will hold up bring pressured up by 6 - 10PSI without bleading down. I don't know how to setup for a test like that without some custom plumbing.


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PostPosted: Mon Sep 05, 2011 8:44 pm 
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I'd be real carefull with a positive pressure test. I've never seen one done on a lower unit (though I'm a shadetree mechanic and have only done 1 lower unit in my "career"), but I can tell you what happens when a positive pressure test goes bad with ASME Code vessels (drums/tower/refinery/chem plant stuff) and pipe. It ain't pretty when it goes wrong.

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PostPosted: Mon Sep 05, 2011 9:55 pm 
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yeah thats why they say 6-10PSI only. otherwise you blow out a seal and make a leak where there wasn't one.

Seems like the vacuum test would be a better on since I'm looking for how water seeps in and not how oil gets out.


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PostPosted: Thu Sep 08, 2011 5:11 pm 
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It may have just been condensation build up.

one thing to do when you change oil a lot of people do not do and that is change the little nylon o ring gasket at the top and bottom plug
they will crack and leak . they are cheap and it is better to change them every oil change,


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