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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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  • 1 Post By Capt. Gary Randall
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Old 03-16-2013
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no water exhaust

Hello,

I don't get any water out of my engine's exhaust, only air. I seem to have water pressure at least up to the entrance to the mixing elbow (it flows when I unmount it).

The engine is a 2gm20f with a fiberglass muffler.

It seemed to work well before my boat was hauled out about a month ago. Now I just started the engine for the first time and witnessed that issue
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Old 03-17-2013
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I should clarify: started the engine for the first time after the boat was put back in the water. The whole system ran well before that.

Also that might sound stupid and is probably unrelated but my engine started incredibly quickly. Pushed the button and the engine started almost without cranking at all. Usually it need a couple of rotations to start.
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Old 03-17-2013
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Re: no water exhaust

Just wonder what you are referring to in up to the mixer. It can be quite difficult to remove that u shaped mixer, and I found it easier to have the whole heat exchanger taken off. I take it literally up to the mixer.
The u shaped bit is a part requiring regular replacement say at about 5 years, and or cleaning as it can block. It rusts and develops holes spraying potentially expensive salt water over the engine and mounts. It can block and be cleaned out.
If water is getting past it, then there is a subsequent block either a closed through hull on the exhaust, a leak or some blockage.
I would have thought the motor would not run properly if there was too much back pressure.
I have had a mechanic leave the inlet closed but that doesn't seem to be your problem.
I am no expert just some ideas.
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Old 03-17-2013
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Re: no water exhaust

Water flowing gently out of the hose at the mixing elbow doesn't mean its got enough pressure to fight the exaust pressure. It should really come at you. If the elbow is clear look at the ends of the heat exchanger for rubber bits from the water pump.Check the raw water in from the thruhull for a plastic bag etc.If you are in shallow water it's possible to suck up debris like suspended sawdust and bark. Usually you find this in the transmission cooler (if salt cooled, which is not a good idea anyway) If the sea **** is a non marine type ( the red/white handled gate valve made in China) corrosion has disconnected the shaft /gate, I am usually surprised at what you can see by looking.
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Old 03-17-2013
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Re: no water exhaust

check your intake valve to see if it is open.
check your strainer to see if there are any leaks you can suck air.
If you have water at the exhaust elbow connection it is possible that your muffler needs to fill with water before it comes out the exhaust. I have seen this before
normally when a vessel was winterized all standing water is drained to prevent freezing.
CaptG
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