water in the engine...lots of gray foam

[ehorner]

Purchased my 1999 sport a few months ago, put it in thewater this week, ran for one hour and now this is what I am facing. Water got in through the oil cooler, lookingfor new one now. Been told that if I canget the part, drain oil, fit new cooler and then fill, cycle, drain oil andfilter 4-5 times. I believe my 5.8LGT-40 uses 4 qrts of oil? Use 3 qrts oiland 1 qrt of diesel on each flush? Anyone have advice on this or anything else? Greatly appreciated.

[Tom351]

I have heard to use 3quarts oil and 1qt of Auto Trans Fluid (or 3.5/0.5) in this situation.... The high detergent content in the ATF will help clean up the crankcase.

[ehorner]

yes, heard the same thing. Thank you.

[2001SAN]

Purchased my 1999 sport a few months ago, put it in thewater this week, ran for one hour and now this is what I am facing. Water got in through the oil cooler, lookingfor new one now. Been told that if I canget the part, drain oil, fit new cooler and then fill, cycle, drain oil andfilter 4-5 times. I believe my 5.8LGT-40 uses 4 qrts of oil? Use 3 qrts oiland 1 qrt of diesel on each flush? Anyone have advice on this or anything else? Greatly appreciated.

Bad times. You sure it was the oil cooler? My GT40 has not got an oil cooler, only a tranny oil cooler.

[crobi2]

There may not be an engine oil cooler on your boat. The bullet shaped cooler on the raw water intake hose is a transmission oil cooler in most cases. If you have confirmed water in your crankcase and not in the transmission, you may need to look for a different source.

Hope this helps, good luck.

EDIT: Ooops! +1 on above post - near simultaneous posting!

[AirTool]

I would probably go with a motor oil/marvel mystery oil mix.

In either case, don't run the engine at high rpm or under heavy load....but do run it until you think the oil is above 200 F if possible....to help boil the water out. that might not be possible depending on where you run the boat, lake water temps, etc.

I flushed an engine that sat for about 8 years by this method and it worked good. The old oil didn't have free water but it was gray in color and thicker than farm fresh honey. I'm pretty sure it had factory Mercruiser "marine" oil in it....which doesn't look all that good out of the bottle IMO. Nevertheless, it cleaned up nicely.

I think your ATF is going to foam too much....just sayin.