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Old 04 May 2012, 07:14   #1
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More steam than usual coming out of exhaust pipe

So

Inboard Diesel engine
Checked
Compression of cylinders ľok
No leaks
No water in oil
Changed impeller and thermostat
No water loss from fresh water tank

Water seems to be circulating in an out (raw sea water). Changed the U bend.

Issue seem to be more prevalent when motoring, any tips or checks to make?
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Old 04 May 2012, 07:51   #2
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Are you sure it's steam and not smoke
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Old 04 May 2012, 08:06   #3
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pretty sure its steam
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Old 04 May 2012, 08:46   #4
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The only other way for white, lets say fumes , is a crack in the manifold, it would have to be a funny crack in as much it could only be between exhaust and seawater and I'm not sure that's even possible as the seawater only enters the exhaust system at the exhaust elbow.
It could still be white smoke, dark smoke is lack of air and white smoke is lack of fuel, you might have a bug in the filter that's restricting the fuel slightly.
Try running the engine straight off the pump from a fresh bottle of derv
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Old 04 May 2012, 10:14   #5
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Biffer

a very good point - i will check and thank-you
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Old 04 May 2012, 13:20   #6
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When I owned an inboard there are days you couldn't see the steam and days I would look back and go "What is wrong with my boat?" The colder the morning the more steam that was produced. This was not an issue at all, just had to do with humidity and temperature of the surrounding air.

Unless you overheated it recently, and it is running well, I wouldn't worry about it at all.
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Old 04 May 2012, 15:45   #7
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I would check your fuel system before you stop worrying it
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Old 04 May 2012, 16:08   #8
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Quote:
Originally Posted by biffer View Post
I would check your fuel system before you stop worrying it
Well you would be able to smell fuel big time, and it probably wouldn't be running very well.
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Old 04 May 2012, 21:24   #9
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Well you would be able to smell fuel big time, and it probably wouldn't be running very well.
Not so. We are talking about air fuel mixture. Explain how you can smell that.
You would have to run it a sustained high revs before you could determine whether it wasn't running right and then with a restricted flow. (Which is the white smoke). As soon as you come off revs it stops running rough.
This ain't the first time at this
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Old 05 May 2012, 01:43   #10
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You dident mention you changed the fuel filter in your list think I would have changed that first before doing compression tests
could just be a restriction at full flow or a faulty injector
what did the cylinder compressions say in your test
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