I have a 10hp Westerbeke 2cycl 10hp Diesel engine .. when at idle, and running without transmission engaged engine runs up to 3500 RPM's no problem..water discharge is clear ... CONVERSELY .. when transmission is engaged, engine won't rev beyond 2500 RPM's and it appears black soot/water is coming out of discharge .. WHAT'S UP WITH THAT ????? ... by the way oil pressure, temperature appear to be within aceptrable ranges... HELP ...
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Rich
Try this
Rick, I'm not a mechanic, but had a similar situation with my Yanmar this year. Mine was as simple as the oil level was to low and the sender unit was bad giving a false reading. So before doing anything major I would check your level first, then make sure your oil filter is clean.
Rick, I'm not a mechanic, but had a similar situation with my Yanmar this year. Mine was as simple as the oil level was to low and the sender unit was bad giving a false reading. So before doing anything major I would check your level first, then make sure your oil filter is clean.
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David C. Hirtle
Diesel engine question
I'm not a mechanic so take this with a grain os salt but in my experience it sounds to me as if your prop may be not be properly fitted to the drive train...the engine is loading up. Give it a check!
I'm not a mechanic so take this with a grain os salt but in my experience it sounds to me as if your prop may be not be properly fitted to the drive train...the engine is loading up. Give it a check!
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lnranch
Soot in water
I have a Universal 11 hp on my O'Day 28 and it is raw water cooled. It is normal for soot to be mixed in the exhaust water. Most engines will rev up high when not in gear (no load). It sounds like your engine is operating normally. Good Luck
I have a Universal 11 hp on my O'Day 28 and it is raw water cooled. It is normal for soot to be mixed in the exhaust water. Most engines will rev up high when not in gear (no load). It sounds like your engine is operating normally. Good Luck
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Vic
how many hours?
My 272le has a universal 12 which is very close ... and it does kick up a little soot on the sea water ... ran it for four hours nearly wide open last week and that motor ran like a swiss watch. diesels do kick out a little soot when operated rich which the cooling water will wash out of the exhaust. as long as you are not blowing black smoke ... I think you are operating normally. I'm still trying to find out how much fuel is in the tank though.
My 272le has a universal 12 which is very close ... and it does kick up a little soot on the sea water ... ran it for four hours nearly wide open last week and that motor ran like a swiss watch. diesels do kick out a little soot when operated rich which the cooling water will wash out of the exhaust. as long as you are not blowing black smoke ... I think you are operating normally. I'm still trying to find out how much fuel is in the tank though.
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Russ Marcks
No, this is NOT normal
Dave is right. Black soot from a deisel means the engine is being lugged. Typically, this means you are overpropped. I'm going to assume you mentioned 3500 rpm because this is the rpm where the manufacturer rated the engine at max HP. The engine should 'cruise' about 200 to 300 rpm below that which should correspond to peak torque. A torque/HP vs. rpm curve would come in handy and is available from the manufacturer. If you can't come up beyond 2500 rpm, then, as Dave stated, you probably have to large of a prop. But another possibility is to large an alternator. For example, a 120 amp alternator draws about 9 hp at full output. A 75 amp alternator draws about 5 or 6 hp. Assuming a 75 amp alternator at full output, you would only have 4 or 5 hp left to drive the boat. This is probably inadequate and the problem could appear like an overpropped engine. But the bottom line is the engine is being lugged. Check with a good marine mechanic. I know that Volvo-Penta requires their licensed service dealers to be able to size a prop for a specific boat. Russ
Dave is right. Black soot from a deisel means the engine is being lugged. Typically, this means you are overpropped. I'm going to assume you mentioned 3500 rpm because this is the rpm where the manufacturer rated the engine at max HP. The engine should 'cruise' about 200 to 300 rpm below that which should correspond to peak torque. A torque/HP vs. rpm curve would come in handy and is available from the manufacturer. If you can't come up beyond 2500 rpm, then, as Dave stated, you probably have to large of a prop. But another possibility is to large an alternator. For example, a 120 amp alternator draws about 9 hp at full output. A 75 amp alternator draws about 5 or 6 hp. Assuming a 75 amp alternator at full output, you would only have 4 or 5 hp left to drive the boat. This is probably inadequate and the problem could appear like an overpropped engine. But the bottom line is the engine is being lugged. Check with a good marine mechanic. I know that Volvo-Penta requires their licensed service dealers to be able to size a prop for a specific boat. Russ
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Russ Marcks
oops
I read black soot, but was thinking black smoke. However, based on your statements of rpm, I still would be concerned about being overpropped, having to large an alternator, or both. Russ
I read black soot, but was thinking black smoke. However, based on your statements of rpm, I still would be concerned about being overpropped, having to large an alternator, or both. Russ
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Vic
What is normal on a 15 yr. diesel?
Before you get paranoid about overprop and over alternator ... what makes you think anyone would have made prop and alternator changes on your 272? You still have the two blade? you still get a comfortable 5.5 knots under power? no big black smoke? That's seems pretty normal to me for a 272LE.
Before you get paranoid about overprop and over alternator ... what makes you think anyone would have made prop and alternator changes on your 272? You still have the two blade? you still get a comfortable 5.5 knots under power? no big black smoke? That's seems pretty normal to me for a 272LE.
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