Re-engined boat developed water in oil. Can it be heat exchanger? - Page 2 - SailNet Community
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post #11 of 23 Old 08-19-2019
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

Another possibility is a cracked water-cooled manifold dribbling into open exhaust valve . Some conversions Ive seen (fords) depend on the gasket to seal water from exhaust ports Woud need removal ? and pressure test )which is easier than pulling the head and would be necessary if you need to pull the head anyway . Is the H ex. a separate unit. If so .not the problem By the way, pathfinders have been known to runway on their own lube oil if it gets too high (floating on water?)

Last edited by Capt Len; 08-19-2019 at 12:49 PM. Reason: clarification
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post #12 of 23 Old 08-19-2019 Thread Starter
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Denise, could you elaborate on the last two things.

"Clogged mixing elbow, wrong design,

More than one trap in the discharge hose to transom."

Are you saying my mixing elbow is wrong?


Are you saying I need another trap in large exhaust hose?
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post #13 of 23 Old 08-19-2019 Thread Starter
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Capt Len;

My heat exchanger is a seperate unit from intake, but it bolted to exhaust ports of the engine.

Is lift muffler failure a possibility. It ran okay before adding water to the system, granted, I ran it no more than 30 seconds.
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post #14 of 23 Old 08-19-2019
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

I wasn't saying that, there should only be one trap in the discharge line to the transom from what I understand.


I was looking at your mixing elbow, about it looks like it's upside down but I'm probably wrong about that, and it's just the way it's designed.

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post #15 of 23 Old 08-19-2019
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

who made the exhaust elbow. could it be on backwards. water usually goes in on the end nearest the engine

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post #16 of 23 Old 08-20-2019
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

Just looked at the photo. Installation is ambiguous. Would depend on the internal configuration. Id look careful at that. hot salt water can cut metal pretty quick so even if its on right doesn't mean its without flaw . Water should squirt down into down rubber hose and engine shut down complete before releasing fuel stop device to prevent snort back
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post #17 of 23 Old 08-20-2019 Thread Starter
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Overbored: riser is on correctly, that is the output from heat exchanger to anti siphon to riser.
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post #18 of 23 Old 08-20-2019
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

Have you taken the hose off the mixing elbow and put water to it to see if it goes straight down to the muffler? I've never trusted mixing elbow design.

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post #19 of 23 Old 08-21-2019 Thread Starter
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I planned on running a few water tests. But can I do it at the end by the muffler, the big one on the Riser is an absolute nightmare to get on, off, or adjust.

I talked to centek, they vaguely said running the original 2"id hose (and had a 1.88" lift muffler) could "cause issues". Im trying to get more specifics. They suggested 2.5" but its a lot of hose, and I can't afford riser, hose, and muffler overhaul. Does a 1.88 that came with it seem odd? The current engine is much smaller than original, doesn't that equate to smaller hose and muffler anyways?. And I assume the similar 1.88" is for the ease of wrestling 2" exhaust hose. Am I wrong?
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Re: Re-engined boat developed water in oil. Can it be heat exchanger?

I don't know if it was mentioned, is it coolant or raw (sea) water that's in the oil?

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