87 evinrude 15hp milky white coming from upper exhaust

john h

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Dec 8, 2006
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milky white coming from upper exhaust port and also coming out of motor directly to the back of upper exhaust port along with exhaust smoke this is an area that should have no discharge of any kind. Rough idle stalling especially going from top speed to low speed.Loss of top end speed. Tore motor apart replaced lots of gaskets. also ran omc fuel conditioner and engine cleaner to remove any carbon deposits.Plugs are wet. Any ides of what the problem is please advise. Thanks
 

kenmyfam

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Aug 10, 2006
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Re: 87 evinrude 15hp milky white coming from upper exhaust

Is it still doing this after replacing "lots of gaskets" as you stated above ?
It is either a blown gasket of a cracked block or head or both. Are the plugs wet and really clean looking ??
 

john h

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Dec 8, 2006
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Re: 87 evinrude 15hp milky white coming from upper exhaust

kenmyfam said:
Is it still doing this after replacing "lots of gaskets" as you stated above ?
It is either a blown gasket of a cracked block or head or both. Are the plugs wet and really clean looking ??
 

john h

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Dec 8, 2006
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3
Re: 87 evinrude 15hp milky white coming from upper exhaust

The plugs are clean but wet. Thanks
 

WillyBWright

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Dec 29, 2003
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8,200
Re: 87 evinrude 15hp milky white coming from upper exhaust

Wet with water or wet with gas? Either a leaking head gasket/warped head, or a hole in the fuel pump diaphragm respectively.
 

F_R

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Jul 7, 2006
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28,226
Re: 87 evinrude 15hp milky white coming from upper exhaust

The milky white stuff is fuel emulsified with water which has done it's job in the cooling system and is then discharged into the exhaust. So, you may be running way too rich, or not running on both cylinders (the not-running cylinder just dumping the unburned fuel out the exhaust. The possible causes are many, as are the guesses.
 
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