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Old 05-16-2010, 02:14 PM
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Default Uh oh!? Milky oil in lower unit.

Draining the oil from the Yamaha 150 lower unit revealed milky oil. Anyone have any idea how bad this is? Is it possible to run the boat - I have 3 charters this week.
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Old 05-16-2010, 02:15 PM
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Old 05-16-2010, 02:48 PM
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The bottom line is that if there's been damage, there's been damage. If it is OK. it is OK. Change the oil, run it for a day or two and change it again. You'll want to find out why it got in there, but I've changed more than my share of lower unit milk shakes and most of them have lived.

The oil actually still protects the steel against heavy rusting. The issue is if the lubricity of the oil is diminished badly enough that there is bearing damage.
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Old 05-16-2010, 02:50 PM
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That means water has gotten in. Amount of premature wear will depend on the length of time, and conditions under which, motor has run since water entered.
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Old 05-16-2010, 02:52 PM
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As mentioned, change it and check the fresh oil. It could be as simple as a leak in the drain screw washers..or as bad as a prop shaft bearing and seal. Change it daily if need be and get on it as soon as possible...
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Old 05-16-2010, 02:57 PM
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Quote:
Originally Posted by captcharles View Post
Draining the oil from the Yamaha 150 lower unit revealed milky oil. Anyone have any idea how bad this is? Is it possible to run the boat - I have 3 charters this week.
Just put fresh oil in and go. Any damage would have already occurred. If you still have the oil run a magnet around in it as see how much metal shavings are in it. Give your mechanic a heads up so he/she can get a foot seal kit in and replace it quickly. Gte new plug washers also. Take the prop off and look for mono filament behind the prop.

You should be OK.
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Old 05-16-2010, 02:57 PM
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Don't forget to change both drain and vent screw gaskets when changing the oil! they are only good to tighten down once!

Last edited by BigPumper; 05-16-2010 at 04:53 PM.
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Old 05-16-2010, 04:42 PM
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Change oil, run charter, check oil, if milky change again.....good luck
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