milky oil

T

TomCaz

New member
The crank case oil is milky, I noticed a slight milky color and changed the oil and over the past few outings the oil continues to get milky but at a faster rate.

The power does not seem to be lacking, Is this a major $$$$$$$$$$$$$$$$ repair or worse?

TomCaz
 
It does sound like water getting into the system and that probably means a gasket or seal is broken somewhere in the system. Could be a head gasket, could be a number of other seals depending on make and model. Regardless of the cost to find and fix the problem, it will not get any cheaper the longer you run it with this problem especially if you are introducing salt water into the inside of the engine. You should seek fairly immediate help if your running in salt water.
 
yes, I knew it was water but do not know the point of entry. Its going in the shop asap. I thought it was odd to be taking on water in the crank case and not have any loss of power

TomCaz
 
I have a Suzuki 90 h.p. and had the same problem. Turns out it was just a bad thermostat. It was replaced and all is well... The good folks at Kitsap Marina took care of me., I wish you good luck.., Sam
 
Could be just the seals in the lower unit, just replace them and see if that fixes the problem.I would also check to see if the vent/fill screws .( lower unit ). are sealing properly.I would replace them too..they are cheap.I had the same problem ...milky oil..when i had some-ones fishing line get wrapped around my propeller and messed up the seals.Tug
 
The oil in the crank case is completely separate from the lower unit. If the milky material is in the lower unit--then definately seals.

No matter what don't run the engine any more, and get it taken care of next week. I would change out the oil now, and leave the clean oil sit in the unit until it is fixed. There can be multiple causes.
 
Jack in Alaska":1xl8qhh5 said:
My 90 Honda did exactly that....it was the thermostat. They are cheap and an easy self repair.

Jack
Click to expand...

If it is running cold, incomplete combustion will cause milky oil. I had that issue on an 8hp Honda classic, but never (yet) on the Honda 90... The cure on the 8hp was a different thermostat, and hotter plugs.
 
One of our twin 40 Honda's thermostats stuck open on our 2007 Southeast Alaska cruise. Would hardly run at idle and crankcase filled with unburned gas mixed with the oil, but remember color of oil and gas to be darker if anything then normal. Bought my replacement thermostat from Les at EQ (now carry a spare in boat) and though I thought the engined might have been damaged he suggested otherwise. It now has 1336 hours on it and has run great for the last 300 hours since the thermostat stuck , so appears he was right.

Jay
 
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