I'm not sure that condensation would be a likely source for any significant amount of water to get into the engine oil. The only real point of entry would be some sort of reverse flow through the EGR valve, which doesn't seem like it would be likely to admit much water vapor - particularly in a semi-arid area. And any rainwater would need to get in through the carburetor and likely collect in the intake manifold and have little chance of leaking into the oil pan.
The suggestion of a leak in the engine oil cooler seems a likely possibility, assuming you have one on that engine model. Another might be having water in the exhaust manifold when the engine was shut down that leaked back into the engine through partially opened exhaust valves. I lost an engine on my 38 that way: The PO had cut corners when the original A4 was replaced by the diesel, and when the boat heeled to port while sailing water in the lines and muffler could get back into the exhaust manifold. Was OK for a long time because starting the engine blew the water out. But I lost a rudder, had to be towed in, and during the months that the boat was on the hard during the replacement the water leaked into the engine and corroded piston rings to the cylinder wall so the engine would not start - which required a rebuild or a new bobtail engine (which turned out to be less costly). Never looked at the oil pan on the old engine, but seems pretty likely there was water in there. Of course, YMMV. Good luck with the engine. Rick Brass Washington, NC -----Original Message----- From: Stus-List <cnc-list@cnc-list.com> Sent: Oct 26, 2023 7:06 PM To: Stus-List <cnc-list@cnc-list.com> Cc: Korbey Hunt <kampf2...@hotmail.com> Subject: Stus-List Re: Water in the oil Yes. Good possibility, my boat is in Loreto/ Puerto Escondido. I was in San Carlos a few years ago. Fun town. Get Outlook for Android (https://aka.ms/AAb9ysg) From: Doug Mountjoy via CnC-List <cnc-list@cnc-list.com> Sent: Thursday, October 26, 2023 12:27:55 PM To: Stus-List <cnc-list@cnc-list.com> Cc: Doug Mountjoy <svrebeccal...@gmail.com> Subject: Stus-List Re: Water in the oil There was enough water to turn the oil to chocolate milk. Could be condensation, there was a couple of nasty storms that came through here this summer. I'm in San Carlos MX. in the desert. Didn't have this problem last year. I'm kinda thinking it might be the lube oil cooler. Douglas Mountjoy 1988 LF 39 Mexico at large 1984 Sabre 34 Port Orchard, WA On Thu, Oct 26, 2023, 11:32 Jeff Nelson via CnC-List <cnc-list@cnc-list.com (mailto:cnc-list@cnc-list.com)> wrote: How much water? A little could be condensation... Cheers, Jeff Nelson Muir Caileag C&C 30 - 549 Armdale Y.C. On 2023-10-26 14:59, Doug Mountjoy via CnC-List wrote: > I have a Yanmar 4JHE in my boat. After 4 months sitting on the hard, I > have water in the oil.Does anyone know where the most likely place for > leaking is? > When I put her away last spring, I had flushed the engine and let the > hoses drain. > I'm at a loss here. > > Douglas Mountjoy > 1988 LF 39 > Mexico at large > 1984 Sabre 34 > Port Orchard, WA > > Please show your appreciation for this list and the Photo Album site and help > me pay the associated bills. Make a contribution at: > https://www.paypal.me/stumurray (https://www.paypal.me/stumurray) > Thanks for your help. > Stu Please show your appreciation for this list and the Photo Album site and help me pay the associated bills. Make a contribution at: https://www.paypal.me/stumurray Thanks for your help. Stu
Please show your appreciation for this list and the Photo Album site and help me pay the associated bills. Make a contribution at: https://www.paypal.me/stumurray Thanks for your help. Stu
