Cracked head?

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Cracked head?

Postby Frylock » Tue Dec 17, 2013 11:27 am

Milky oil in crankcase, and overflowing through breather valve. Is there another explanation other than a cracked cooling jacket? I should add that when I pulled the dipstick out oil/water pushed out of motor indicating that there was a lot of water as it was way overfilled.
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Re: Cracked head?

Postby Smith » Tue Dec 17, 2013 5:48 pm

A failed head gasket is another possibility.
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Re: Cracked head?

Postby bulletman » Tue Dec 17, 2013 6:15 pm

Is it a four stroke boat motor????? If so search "four stroke making oil"
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Re: Cracked head?

Postby Frylock » Wed Dec 18, 2013 7:34 am

Smith wrote:A failed head gasket is another possibility.

Ugh.....another fear of mine.
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Re: Cracked head?

Postby Frylock » Wed Dec 18, 2013 7:36 am

bulletman wrote:Is it a four stroke boat motor????? If so search "four stroke making oil"

Interesting stuff, and it could be my issue. My motor is a Yamaha F15, I hope this is the problem. Thanks for the help.
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Re: Cracked head?

Postby Frylock » Fri Dec 20, 2013 7:11 pm

Screw it, bought a new Yamaha 15 today.


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Re: Cracked head?

Postby Boatman » Sat Dec 21, 2013 8:38 am

If you leave the fuel line hooked up and the vent on the fuel tank closed you will fill the motor,crankcase, with fuel. Just too much pressure for the carb needle and seat.
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Re: Cracked head?

Postby midaoutlaw » Mon Dec 30, 2013 6:43 am

Smith wrote:A failed head gasket is another possibility.



:thumbsup:
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Re: Cracked head?

Postby Swanny » Mon Dec 30, 2013 11:16 am

My four stroke honda was doing that same thing. It ended up being a thermostat stuck open. It doesn't allow the engine to get hot enough and will make a lot of condensation in the oil.
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Re: Cracked head?

Postby mudpack » Tue Dec 31, 2013 8:09 am

While condensation can turn oil milky, it will not create an overfull crankcase.

While fuel in the oil can create an overfull crankcase, it will not turn the oil milky.

Most likely a head gasket.
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Re: Cracked head?

Postby Frylock » Tue Dec 31, 2013 9:41 am

mudpack wrote:While condensation can turn oil milky, it will not create an overfull crankcase.

While fuel in the oil can create an overfull crankcase, it will not turn the oil milky.

Most likely a head gasket.

The conclusion I came to as well, the oil came gushing out of the dipstick hole and was very thin and watery, plus it was the color of coffee with lots of milk. My mechanic also said gas in the oil would not create that color. Sold that motor last week to a guy who will strip it for parts.
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