Re-engined boat developed water in oil. Can it be heat exchanger? - SailNet Community
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post #1 of 23 Old 08-17-2019 Thread Starter
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Re-engined boat developed water in oil. Can it be heat exchanger?

~~~I REALIZE THE LIKELIHOOD OF A BLOWN HEAD GASKET, OR HEAD ISSUE, BUT....""""~~~


Hi,

I don't know where to begin with my question, so any leads are helpful. I have an older VW pathfinder engine with a bowman heat exchanger. I just installed the engine, got it running without water (just for a very little while to make sure fuel & electric was working) and it ran fine. Once water pump was installed, and engine was run for a minute or so, it wouldn't restart (after idol was set too high, shut off, fixed, restarted 2 times no issue, 3rd time wouldn't start), and I had water in the oil.

I REALIZE THE LIKELIHOOD OF A BLOWN HEAD GASKET, OR HEAD ISSUE, BUT....

I was wondering what possibility it could be leaking from the heat exchanger. For one, there is no antifreeze detected (circulated from internal water pump and antifreeze tank), and it only happened once water was introduced, so it seems possible it could be heat exchanger issue. it is an external water pump, so it can't be leaking from the raw water pump. I'm not experienced in wet exhaust systems so I don't know the possibilities of it leaking from the heat exchanger. I did not have a chance to view the exhaust aft of the transom to know if there was proper water exit. It was never run for over a minute.

Thanks for any help or direction you can provide.
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post #2 of 23 Old 08-18-2019
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

Do you have a anti siphon in the sea water circuit?
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post #3 of 23 Old 08-18-2019 Thread Starter
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Yes, and I just got done reading how common these crappy little plastic pieces go bad. I heard it hissing like crazy towards the end of its Run Cycle. I drained the oil and took off the filter today, and I will do a couple of oil changes with the new anti siphon and higher lift in the lift Muffler. Unfortunately, on its last run it started to develop a nasty sound. Hopefully I didn't been things to destruction. I'm also going to remove the glow plugs and have the starter rotate the engine for a few to see if that helps push any piston water that may be here. Any other suggestions before lighting this up again and / or removing water that's inside?
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post #4 of 23 Old 08-18-2019 Thread Starter
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However, I also dont understand how anti siphon failure allows water into my engine when the system is meant to be run with flowing water. And should there be air relief on the top of exhaust hose above lift muffler, or is a loop sufficient?
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post #5 of 23 Old 08-18-2019
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

This is a time when photographs would really help,. because, no one's there looking over your shoulder, they can't see what you're talkin about unless you use photographs.

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Waterline is in blue. Post wouldn't allow me to turn anti siphon pic 90. (Mess is temporary)
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post #7 of 23 Old 08-18-2019 Thread Starter
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And if anti siphon failure allows water into engine, what stops the water from the anti siphon break to keep from coming back into the engine. That's a solid amount of water through that 3 1/2 foot tube.
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

Only a guess, too much water is falling back to the engine. Never seen a siphon tube that high above the engine I know supposed to be above the water line is the raw water pump strong enough?

Just thoughts:
Bad HeatEx would be coolant in the oil

Clogged mixing elbow, wrong design,

More than one trap in the discharge hose to transom

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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

Must have a vent in the top of loop. Lets air in. Pissser tube up to overboard or the silly little diaphragm that always dribbles or fails,. Only the water in the exhaust side drains back down to water injection point . I usually put a drain valve in the water lift so no way will it fill. ,,, Crank engine with plugs out to see if any water spray. Sounds like a head gasket.
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

I feel bad usually the forum is all over a post like this, you don't seem to be getting much attention hope it's not head gasket!

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