Today I went to tackle the removal
of oil from engine replace the oil and oil filter and it all went pear shaped now water
is in the oil
First I checked the oil level with the dip stick and found that the oil had somehow increased in level from about 4/5 the level to being about 20% over the maxuim level
The engine had not been run for nearly a week so I assumed that either Diesel fuel
had somehow leaked into engine or high up oil in engine had dropped down and running the engine would reduce the oil level.
I dipped the stick several times to confirm level and smelled the oil to see if had diesel
fuel smell. The oil was very clean nearly no colour as it had only been in engine running about one hour run time and no diesel odour I could smell
I ran the engine for ten minutes to warm the oil up and stopped engine
I connected up the oil suction pump
and took all the oil out.
Then as I stopped the oil suction there was evidence o very milky oil to be seen .
I recantened the oil into clear can and it was all very milky oil
I estimate that some ~1/2 litre of water was now in the engine oil of about ~2.5 liters of engine oil
The Yanmars are known to have corrosion
and other pipes that can allow water to enter engine.
I am open to any suggestions that can say which is the most likely source of water eg head gasket exhaust elbow
When I started engine it was as always slow to start about 10 seconds to start as it drags fuel into engine.
The engine nearly started and then it suddenly stopped like it hydro locked from I thought too much fuel . I turned key again and it started after ten seconds..
The engine ran smoothly for some ten minutes before I stopped it
Last night there was choppy water one foot waves hitting the stern so I don't know if water went up the exhaust pipe system
Two weeks ago the toilet valve broke and when in returned to boat a few hours later some large amounts of water had come in the boat and was 6 inches above the floor boards and up to the level of the oil sump.
I bailed out boat repaired the broken valve and checked the engine and when all was dry ran it for few hours and oil checks showed no water ingress
Then the next week ran the engine for about one hour and that was the time all the oil fell out of engine
The next day I filled up the oil ran the engine for a hour and oil fell out out again
I filled up the oil again and ran engine several times mostly about 20 minutes and no indications of where there was a oil leak and no signs of milky oil
I waited week for parts and today went to drain out oil and now it milky oil ???
Thanks a head
for any inputs