boating4fish
Recruit
- Joined
- Mar 8, 2010
- Messages
- 4
When I found extra milky looking oil on the dip stick I was sure I had a water leak, but after reading some threads I think I was doing everything right(or wrong) to "Make oil". I was trolling on the motor for many hours in 50 degree water with a thermostat which I think was sticking open on a lake with a 5mph limit. The motor is a 2003 mercury 90 hp 4 stroke.
It seems like everyone correlates milky oil to water contamination I wonder can gas or something else also turn the oil milky?
This is why I ask, I changed the oil and filter three time to get rid of the old junk. I then ran the engine for an hour or so on the lake just like I was doing before and checked the oil when I got home. There was little more oil then when I started, started at 1/2 and it was 3/4 up the hashing. It was mostly clear but there was a small amount of white bubbles. I left the engine down and checked in the morning the oil was all milky and up over the hashing. The oil smelled a little like gas, but I couldn't tell for sure.
I would think if it was water being emulsified it would not continue without the motor running or am I wrong to think that?
I did not know about the thermostat yet, but I was pretty sure how I was operation the engine was causing the problem but before running that test I checked the compression and ran water through the flushing port for over an hour so I am pretty sure there was no obvious paths for water.
Changed the oil again three times, checked the thermostat, it got stuck open the first time in hot water, but started working after I pushed it closed so I replaced it. Checked the fuel pump and it was working OK. I changed the plugs as well.
I ran the engine again for a couple hours up on plane and the oil looks good.
While running I also checked the RPMs at WOT. ~5200 with the drive all the way down and 5600 trimmed up for max speed.
Besides sending the oil in for analysis is there anything else I can do to confirm it was fuel not water getting in?
It seems like everyone correlates milky oil to water contamination I wonder can gas or something else also turn the oil milky?
This is why I ask, I changed the oil and filter three time to get rid of the old junk. I then ran the engine for an hour or so on the lake just like I was doing before and checked the oil when I got home. There was little more oil then when I started, started at 1/2 and it was 3/4 up the hashing. It was mostly clear but there was a small amount of white bubbles. I left the engine down and checked in the morning the oil was all milky and up over the hashing. The oil smelled a little like gas, but I couldn't tell for sure.
I would think if it was water being emulsified it would not continue without the motor running or am I wrong to think that?
I did not know about the thermostat yet, but I was pretty sure how I was operation the engine was causing the problem but before running that test I checked the compression and ran water through the flushing port for over an hour so I am pretty sure there was no obvious paths for water.
Changed the oil again three times, checked the thermostat, it got stuck open the first time in hot water, but started working after I pushed it closed so I replaced it. Checked the fuel pump and it was working OK. I changed the plugs as well.
I ran the engine again for a couple hours up on plane and the oil looks good.
While running I also checked the RPMs at WOT. ~5200 with the drive all the way down and 5600 trimmed up for max speed.
Besides sending the oil in for analysis is there anything else I can do to confirm it was fuel not water getting in?
