corn head grease removal?

Mercury Outboard  general discussion

corn head grease removal?

Postby Four Sons » Mon May 27, 2019 10:45 pm

I've got corn head grease in my Mk55 lower unit.  It's several years old, but only about 8 hrs of use.  I removed the vent and fill screws and absolutely nothing came out over the winter into the plastic pan under the motor.  Should I attempt to heat and drain it... or just fill with new until the new stuff shows up at the vent screw?

Thanks, Pat
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Re: corn head grease removal?

Postby dave bernard » Mon May 27, 2019 10:48 pm

Just add till it looks clean.
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Re: corn head grease removal?

Postby Four Sons » Thu May 30, 2019 11:52 pm

Thank you sir.
Pat Corry
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Re: corn head grease removal?

Postby 58woody » Thu May 30, 2019 11:55 pm

I have also used a little compressed air to squeeze it out.
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Re: corn head grease removal?

Postby Yellowjacket » Fri May 31, 2019 1:45 am

Warming it up a bit is fine, it'll drain much better if you get it to over 100F.  Corn head grease when fresh does flow some and if it's warm enough it should at least drip out.  If not some air is probably a good idea to get it to the point where it is flowing some.

I would want to look at it before I started mixing in new grease and make sure there was no water in it, but if you only had 8 hours on the motor it probably doesn't have any water in it.

If you just pump through you won't get a good bit of grease that is in there and it'll take a lot more to get it to the point where I'm happy with the flush.
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