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Old 08-30-2015, 07:59 PM   #21
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Or not enough air getting to the engine. Air filter clogged?
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Old 08-30-2015, 08:02 PM   #22
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Mud dauber nest in the PCV valve...
Now that's out-of-the-box thinking! But no.
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Old 08-30-2015, 08:03 PM   #23
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Or not enough air getting to the engine. Air filter clogged?
Air filters replaced twice. Airflow pathway clear. Not it.
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Old 08-30-2015, 08:05 PM   #24
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Bad exhaust flapper?
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Old 08-30-2015, 08:10 PM   #25
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Gas in the diesel.
Fuel ok.
No exhaust flaps
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Old 08-30-2015, 08:10 PM   #26
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Tell us, tell us, tell us.
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Old 08-30-2015, 08:10 PM   #27
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Blocked intercooler?
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Old 08-30-2015, 08:12 PM   #28
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Partially blocked sea strainer, lack of raw water, ...
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Old 08-30-2015, 08:13 PM   #29
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Filters too big, too much fuel?
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Old 08-30-2015, 08:14 PM   #30
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Valve clearance not right?
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Old 08-30-2015, 08:15 PM   #31
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Dammit man!
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Old 08-30-2015, 08:16 PM   #32
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Timing chain!!!!
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Old 08-30-2015, 08:16 PM   #33
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Greetings,
Mr. HW. So, NOT the cockroach eh? Hmmm...Too much fuel is being injected and/or not enough air is getting to the cylinder(s) for complete combustion.
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Old 08-30-2015, 08:17 PM   #34
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Don't tell yet but another hint perhaps?
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Old 08-30-2015, 08:21 PM   #35
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Tell us, tell us, tell us.
Alrighty then...
It wasn't the port engines fault at all!
The starboard transmission was slipping! The Starboard engine reved up to WOT but the prop didn't. The boss looked at the stbd shaft and said it ought to be turning alot faster for that RPM.
The Port engine was overloaded trying to pull the whole boat up to speed because the stbd was slacking off, hense the black smoke.
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Old 08-30-2015, 08:23 PM   #36
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Well heck. At least I got my post count up!
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Old 08-30-2015, 08:25 PM   #37
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Though, why wouldn't the port engine "come up to cruise" RPMs as per your OP?

I would have thought it would in this case?
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Old 08-30-2015, 08:32 PM   #38
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The stbd engine was not pushing much at all. Had the owner tried to power the boat from the starboard engine alone, the fault would have been obvious. But he always pushed up both throttles together.
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Old 08-30-2015, 08:41 PM   #39
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Wow, that's a good one.
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Old 08-30-2015, 08:47 PM   #40
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The stbd engine was not pushing much at all. Had the owner tried to power the boat from the starboard engine alone, the fault would have been obvious. But he always pushed up both throttles together.
But given that the port engine would have behaved normally and got to normal RPM for that throttle position, and the boat would have turned to starboard, hence indicating an weakness issue with the starboard engine? No?
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