Water in gearbox oil??

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Joined: Sun Nov 27, 2016 5:06 pm
Boat: 6.5m Rubber duck with 2 X 60 Mariners
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Location: Cape Town but lives in Thailand

Water in gearbox oil??

Post by Bkkaquaman » Tue Oct 06, 2020 8:20 pm

Hi everyone,
I bought a second hand Mariner 60HP (two stroke) as a backup motor. When I drained the gearbox oil, it was milky white.(see picture)
Just wondering if this is water in the oil, or if it's some special expensive/cheap oil, or if it has an additive in it. I've never seen gearbox oil look this white. It also didn't smell like normal gear oil....rather a pungent smell and had the consistency of enamel paint.
Any comments would be appreciated.

Posts: 75
Joined: Wed Apr 17, 2013 3:19 pm
Boat: 4.6 m Coast Craft, 60 hp Yamaha

Re: Water in gearbox oil??

Post by GUPPIGETTA » Wed Oct 07, 2020 7:52 am

That is a sign of water in the oil. You will have to fit new oil seals and O-rings to the gearbox.

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