posloke123
Cadet
- Joined
- Jun 13, 2016
- Messages
- 9
I have a 99 Cobalt with twin Volvo 5.7Gsi and DP-SM drives. I pulled the boat to winterize and do drive maintenance (and some bottom paint touch up). I used muffs to cool the engines while I got them hot enough to change the oil (a few weeks ago). I pulled the drives off this weekend and changed the drive oil. When I pulled the drain plug on the starboard drive about 10-15 ounces of clear clean water came out (our lake water is green tinted, but clean). Then the oil came out. There was no emulsion and the oil and water were clearly separated, so the water was almost certainly not in there when the drive was turning (running in the lake). My guess is that somehow when I ran the water to the muffs it leaked into the drive in the couple of minutes before I started the engines. I assume there would be about 40 psi water pressure and that might have passed through the seal on the freshwater feed pipe between the upper and lower units. But I would also assume any leakage would just run out the exhaust channel since the fresh water pipe appears to pass through it. I guess it's possible it could have leaked into the bearing retainer but that seems like a long shot.
I pressure tested and vacuum tested the drive and it passed (vacuum at 15 in - lost 1/2 in in 5 minutes).
Any ideas how I might have gotten clean fresh water into the oil without any emulsion? And of course, what to do about it.
I pressure tested and vacuum tested the drive and it passed (vacuum at 15 in - lost 1/2 in in 5 minutes).
Any ideas how I might have gotten clean fresh water into the oil without any emulsion? And of course, what to do about it.