366 Kohler Generator raw water discharge?

[hargsnz]

I have a new to me 2003 366 with 280HP Cummins & an 8 KvA Kohler. I have had part of 1 summer on board so far & we are loving the space & the set up. However I am now doing pre-season maintenance like filters etc.
It's true to say I haven't paid much attention to where the raw water from the generator exits the boat until now.

I replaced the impeller & took the heat exchanger off & cleaned it up, flushed & replaced the coolant & started it up. The first thing I looked for was to see the raw water discharge.

There was none I could see. None coming out of the exhaust outlet at the stern of the boat.
Expecting a blockage between the siphon break & the muffler, I've spent some time cleaning out the hoses etc with Barnacle Buster type stuff. If I now blow through the hose at the siphon break I can hear bubbles in the muffler.

But still no water out of the exhaust outlet.

However I do see the water coming out underneath the boat part-way down the hull. The generator runs OK but surely it's not meant to be in effect a dry exhaust going the length of the boat?

Because the generator is under the floor & up against a bulkhead I can't see the elbow mixer for the exhaust & the raw water, without cutting some extra hatches in floor.

Can anyone help with information for this model 366 exactly where the raw water is supposed to come out from the generator?

[bud37]

Check this out ,may help if right model.Page 181......

http://www.carveryachts.com/media/3993/2004-3408v1.pdf

[bud37]

To add, have a look at the parts drawing for your gen.Section 8.2.....this is the 2003.

http://www.carveryachts.com/media/3829/ ... ual_03.pdf

[Viper]

You probably have an exhaust/water separator where the exhaust exists the side of the hull and the water discharges under the hull. Look for one of these in the engine compartment (follow your exhaust hose), yours may be black. If you have one or something similar, the water is discharged under the hull.
http://www.centekindustries.com/products/2-x-2-x-1-5-gen-sep/

You may have a canister style but one hose will lead to a seacock.

[hargsnz]

Thanks guys I do have the drawings & the manual, but they don't really show where the water exits & the exhaust exits from what I can see. There is a short hose facing the stern that looks like it goes thru the hull on the drawings - but I don't have that. The only hose I can see is the long one that runs the length of the boat & carries the exhaust gases. My expectation is that this would also carry the salt water - keeping the hose cooler. The hose carrying the salt water must go through the hull on the side of the generator against the bulkhead. I can't see that side at all.

I do have a canister muffler & it has water in it as a 'water-lock' style. I'm told there's an elbow behind the generator that I can't see that's supposed to combine the gases & the salt water. I just can't work out why they'd separate the water back out.

I was hoping another 366 owner would step in an advise where the salt water comes out on their boat.

I guess I'll just cut the hatch in the floor over that side & take a look. I'm concerned that this elbow ( like a riser ) may have collapsed internally some way blocking the water flow & the underwater exhaust. It looks to me that the water should come out at the stern & the exhaust exit under the boat. That is an "underwater exhaust' like it says in the marketing material.

[tomschauer]

If you weren't moving raw water, the exhaust hose would get hot quickly and the genny would overheat and shut off after five or ten minutes. It must be going somewhere if it keep running.

[Viper]

They separate the water and direct it under the hull because it makes it quieter that way. All you get out the side of the hull is the quieted exhaust rather than the splashing water that would usually accompany it.

If you have a separator, it will either be built into the muffler or a separate unit from the muffler. if you see a smaller hose coming out of your muffler along with the exhaust hose going into it form the generator and out again to the stern, then you have a built in separator. If you don't see the smaller third hose, follow the outlet exhaust hose from your muffler and see if it leads to a separator as noted in my link above. If it doesn't, then you should be getting water out the side of the hull where the gases are discharged.

If you're not pumping water, the generator won't run for long if its over-temp shutdown is working properly. Don't know what model you have but it may also have a low water pressure shutdown if it's not pumping. If it does have low pressure shutdown feature, the generator won't run longer than 10 seconds when there's no water.

[hargsnz]

Viper I believe you are right, I have been concerned not to try to run it too long because I'm told that the fibreglass muffler will only handle so much heat. But I cut a new hatch in the floor over the genset so I could get at the radiator holding tank and view the side next to the bulkhead. I could then see the join of the raw water hose into the exhaust elbow from the manifold. Running the genset shows that this part of the exhaust is quite cool, I'm guessing as you say the water cools an inner exhaust pipe and then exits under the boat while the exhaust gasses after cooling travel the length of the boat and exit at water level at the stern. I'm just so used to seeing hot exhaust gasses and cooling water exiting together & that's what the Kohler manual shows. Anyway I know a lot more about this genset now than I did before.