Diesel exhaust- water? - Page 2 - SailNet Community
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post #11 of 27 Old 06-13-2006
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No water out the exhaust would worry me and I've not experienced the water seperator that Deep speaks of. I would suggest it's quite rare. Be that as it may, it is of importance to note that if and engine is short of coolant the temp guage may still give a decent reading even when the engine starts to glow because the sensor is designed to sense coolant and not metal temperature. If the engine is filled with steam, the sensor will often give a reading that looks reasonable.
Can you disconnect the water pipe from pump to engine? This should pump a goodly amount of water and will immediately show whether the pump is working or not. Buggered impellers are not the only reason a pump won't deliver, it could be drawing air on a bad joint in the line from the skin fitting to the pump.
Good luck.
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post #12 of 27 Old 06-13-2006
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The other thing that may be the case, is that the engine is fresh-water cooled, much like a automobile engine. If that is the case, you would not see any water being ejected, and there would be no through-hull for the cooling system. There are two types of fresh-water cooled systems, some use sea-water for heat transfer and would require the use of a through-hull, but most do not and are essentially self-contained systems.

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post #13 of 27 Old 06-13-2006 Thread Starter
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Problem solved

Thanks to all who offered suggestions
Problem solved because the cause was unrelated
PO of boat had a professional bottom job during which they faired over the raw water intake. Guess I should have counted seacocks and number of holes in the hull. One less hole than seacock. Who would have thought
After replacing the impeller, and checking many times but no water in exhaust, started to trace the water back. Nothing in the strainer, then removed the intake hose and opened the seacock
Nothing
Used a long 3/8 bit to drill through the open **** andgot soaked. Put it all back together and
Voila- water through the exhaust
Sometimes the answer is so different from the problem you suspect
have a great summer everyone
Marty and Peggy Besant
Margarita- Newport 30
Buffalo NY
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post #14 of 27 Old 06-13-2006
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Are you sure that running the engine without coolant for 20 minutes as mentioned in your previous post didn't cause any damage due to overheating--as someone mentioned, if there is no coolant, the gauge may not have read correctly.
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post #15 of 27 Old 06-13-2006
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My question is how can you run an engine for 20 minutes without cooling water and not cause damage???

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post #16 of 27 Old 06-13-2006
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Quote:
Originally Posted by MBesant
Problem solved because the cause was unrelated. PO of boat had a professional bottom job during which they faired over the raw water intake . . . Used a long 3/8 bit to drill through the open **** and got soaked. Put it all back together and Voila- water through the exhaust
Something seems seriously wrong here. Even fresh water cooled marine engines need raw water - without, destruction is inevitable - especially after running for 20 minutes. Didn't you have this boat surveyed before purchasing from the PO?

How could a "professional" fair over the raw water intake though-hull? I've yet to see one without a strainer grate. If the grate was in place, and you drilled from the bilge side with a 3/8" bit while in the water, then I would suggest you dive down to inspect the condition of the grate. Additionally, your engine will require a larger intake opening than 3/8".

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post #17 of 27 Old 06-13-2006
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Quote:
Originally Posted by TrueBlue
Something seems seriously wrong here. Even fresh water cooled marine engines need raw water - without, destruction is inevitable - especially after running for 20 minutes. Didn't you have this boat surveyed before purchasing from the PO?

How could a "professional" fair over the raw water intake though-hull? I've yet to see one without a strainer grate. If the grate was in place, and you drilled from the bilge side with a 3/8" bit while in the water, then I would suggest you dive down to inspect the condition of the grate. Additionally, your engine will require a larger intake opening than 3/8".
I see a lot of problems with a "professional" fairing over a through hull in general.

But there are a lot of other questions I'd be asking too. Like, if the boat was surveyed, how the surveyor could possibly miss a faired over through-hull. Like, who did the work which resulted in the through hull being faired over. Like, did the PO actually inspect the most recent work done on the boat before selling it.

However, there are a few, albeit rare, fresh water cooled engines that do not require any sea water supply. They are setup much like the cooling system on a modern automobile, which also does not require a sea water supply to function.

I still don't see how any engine, gasoline or diesel, could run for over 15 minutes with out overheating if it requires sea water, and the sea water intake was effectively shut. A hybrid system (fresh water cooling, with a seawater heat exchanger) might be able to do it, but it should have shown some signs of overheating.

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post #18 of 27 Old 06-13-2006
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Running an engine without sea water going to the exhaust will melt your exhaust system.

I agree with TrueBlue.

I think we been had...

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post #19 of 27 Old 06-13-2006
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"PO of boat had a professional bottom job during which they faired over the raw water intake. ...Who would have thought"
Yeah, who woulda thought. Just when you think you've heard of everything.
If this is an intercooled engine (raw water cools heat exchanger, engine is a closed loop) then in cool wx it would be possible to run it without any damage, as the heat exchanger side would be acting as a heat sink and it might do well enough for 20 minutes under no load.
Still worth checking the exhaust very carefully, and especially the impeller and pump in the raw water side to see if they've been damaged.

The hard part is, do you let the bottom get real foul BEFORE you keelhaul the guy who faired it over? Or just keelhaul him now, and do it slowly and repeatedly? Decisions, decisions....
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post #20 of 27 Old 06-13-2006
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Quote:
Originally Posted by hellosailor
The hard part is, do you let the bottom get real foul BEFORE you keelhaul the guy who faired it over? Or just keelhaul him now, and do it slowly and repeatedly? Decisions, decisions....
I'd keelhaul both the PO and the guy who faired it over...repeatedly.

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—Cpt. Mal Reynolds, Serenity (edited)

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