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Old 06-05-2015, 07:38 AM   #1
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westerbeke Gray smoke

. 15kw grey smoke under load any ideas runs good other than that
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Old 06-05-2015, 11:51 AM   #2
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Is it using any coolant?
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Old 06-05-2015, 01:07 PM   #3
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Is it smoke or steam? Steam dissipates, smoke lingers.
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Old 06-05-2015, 01:48 PM   #4
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I think it is smoke. lingers off from the boat for 10 feet or more. As far as using coolant none being used that I can tell.
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Old 06-05-2015, 01:50 PM   #5
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If the smoke is dense, an oil sample analysis should show if there is something really out of whack. Cheap and fast.
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Old 06-05-2015, 02:06 PM   #6
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Post a video of it. It sounds like either steam or fuel.

Is there a sheen on the water where the exhaust comes out?
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Old 06-05-2015, 02:09 PM   #7
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Only happens when you put a load on it? Does the engine/gen seem to work harder now with load than before when loaded?
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Old 06-05-2015, 02:10 PM   #8
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Initially when you first start it up sometimes you get a sheen but it clears after loading for about 10 minutes or so.
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Old 06-05-2015, 02:10 PM   #9
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Grey smoke usually indicates a fuel/rack or governor problem. Usually a perforation in the governor's diaphram allowing more fuel to enter the injectors than is burned.
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Old 06-05-2015, 04:54 PM   #10
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Quote:
Originally Posted by Rogerh View Post
Initially when you first start it up sometimes you get a sheen but it clears after loading for about 10 minutes or so.
Well if there is no sheen at all then it's more likely steam.
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Old 06-05-2015, 07:52 PM   #11
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It does have a sheen but does seem to clear after running a while but the smoke does not. I will try to get a video tommorrow and post. If it is fuel, how should I troubleshoot to narrow down injector or govenor?
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Old 06-06-2015, 06:27 AM   #12
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Cheapest is to check each injectors and cylinder by simply loosening the fuel nut on the injectors , one at a time., while underway , under load.

If its only one cylinder , I would yank that injector and have it rebuilt.

After a rebuild IF the smoke stays its compression check time.

If labor is free a compression check first would be informative.

I would also check the engine operating temp as too cool can cause crap combustion , and smoke.
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Old 06-06-2015, 11:25 AM   #13
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OK, I went out to take the video today of the smoke. Started the gen up and started video, no smoke or sheen at all. Then loaded gen with 4 ACs and still no smoke. Then I let it run for 45 minutes with load up to good operating temp and still no smoke. All is well, I guess I was seeing things. Here is some background of what I did before this.
I changed oil, and flushed coolant, replaced a defective hose from coolant pump to heat exchanger, cleaned heat exchanger with rod through tubes, some clogged a little. Finally replaced zinc and gasket. Now engine running cooler. I did run the gen a number of times through this work with little to no load to check items as I went through the work. ( this might explain some sheen because of not running gen with load for short durations)
After the above work I noticed the smoke after we had been anchored and gen ran all night with little load. 2 ACs on but did not run much after initial cool down of cabin. Cool damp morning. Could it have been a result of warm exhaust water hitting the cooler sea water??? Note it was not very much smoke to start with....
I guess I will monitor and hope I don't see it again.
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Old 06-06-2015, 12:16 PM   #14
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Some atmospheric conditions favor making the "steam" visible. Cool, still and humid. Sounds like what you had.
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