Well we are back from 2 weeks on the water....2 days of which had great wind!. Question for the group.and I will also post in the mechanics area also..... on our return trip we developed 2 problems......1.. we had blue smoke coming out our exhaust..in access of usual......Our mechanic on first hearing of this is thinking ring job.......but the second problem was blackish smelly smoke coming up from our compainionway from the engine.....upon opening the compartment..there was rubber dust..I thought the belt was readjusting itself since I had just installed a new one...but as we progressed the compartment filled with black oily residue.......We thought exhaust leak......But after further discussions belive it is unburned diesel fuel that has vaporized..the cabin filled with this stuff....we shut down and had to be towed back in.....the black "oily" substance is everywhere...in all interior compartments.........We are looking into alot of senereo's the largest is engine replacement....we have already rebuilt this engine....the engine is almost 20 years old......(Perkins) ..in the course of its life the "previous owner" (whom I hold no trust in) said it sat for 10 years.engine hour meter is only 700 hours....but it runs as though it was beat to death...... So the question for the group..what is the oily residue in our cabin. Post note:...water temp/ oil pressure gauges and tach all read norm..dip stick before starting was fine...antifreeze good...sea strainer clear...charging systems all were ok.....just smoke....havent tried to start it since we were towed in...thanks for your help. Rob
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Ted
Broken/Worn rings
Broken or worn rings would cause the blue smoke in your exhaust, they could also result in excessive blow-by, pressurizing your crankcase causing oil vapor to exhaust out of the dipstick tube and engine breathers. A compression test would be the first step in diagnosing this problem.
Broken or worn rings would cause the blue smoke in your exhaust, they could also result in excessive blow-by, pressurizing your crankcase causing oil vapor to exhaust out of the dipstick tube and engine breathers. A compression test would be the first step in diagnosing this problem.
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Don Berger
First things first
before considering any major repair scenarios, the first thing (read the cheapest repair) would be to pull the injectors and have them checked if not done already. Almost assuredly with 700 plus hours and lots of years, they will need it regardless of whether this is the cause of your blue smoke. The most common cause of black soot in the engine room is blow by caused by a clogged exhaust elbow, something you should frequently check on an engine this old. If it is clogged or broken, that will cause both of your symptoms. Other possible causes are worn rings, value problems or head gasket leaks, all of which are major investments not worth making until you've exhausted the easier fixes described above. It's very difficult to tell via email - best to get a trustworthy diesel marine mechanic who won't look at this engine as his next vacation fund. Don Illusion
before considering any major repair scenarios, the first thing (read the cheapest repair) would be to pull the injectors and have them checked if not done already. Almost assuredly with 700 plus hours and lots of years, they will need it regardless of whether this is the cause of your blue smoke. The most common cause of black soot in the engine room is blow by caused by a clogged exhaust elbow, something you should frequently check on an engine this old. If it is clogged or broken, that will cause both of your symptoms. Other possible causes are worn rings, value problems or head gasket leaks, all of which are major investments not worth making until you've exhausted the easier fixes described above. It's very difficult to tell via email - best to get a trustworthy diesel marine mechanic who won't look at this engine as his next vacation fund. Don Illusion
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Ted
After pulling injectors
do the compression test. You probably need to pull them to do the test anyway. If this is OK go on to other things, but don't repair anything til the compression test proves that your cylinders are OK. It's a relatively cheap test and will prevent you from spending money to repair parts on an engine you might decide to replace.
do the compression test. You probably need to pull them to do the test anyway. If this is OK go on to other things, but don't repair anything til the compression test proves that your cylinders are OK. It's a relatively cheap test and will prevent you from spending money to repair parts on an engine you might decide to replace.
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Carter Leary
Water Pump
Rob, Be sure to check your W/P pump impeller which if bad will not pump and therefore will burn and cause smoke , also see if your water pump is pumping water into the exhaust manifold. If not , this will cause any rubber pipes in that system to over heat and burn , which would also cause your smoke problem. Just another thought. Good luck , let us know what you find . Carter Leary
Rob, Be sure to check your W/P pump impeller which if bad will not pump and therefore will burn and cause smoke , also see if your water pump is pumping water into the exhaust manifold. If not , this will cause any rubber pipes in that system to over heat and burn , which would also cause your smoke problem. Just another thought. Good luck , let us know what you find . Carter Leary
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Rob
Meeting with mechanic tomorrow
Thanks for the input guys very helpful. meeting with the mechanic tomorrow..Let you know how it goes. Rob
Thanks for the input guys very helpful. meeting with the mechanic tomorrow..Let you know how it goes. Rob
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Tom
I like Don's suggestions the best
take a look at clogged exhaust elbow. Its probably the least expensive and easiest to check. It should be completely clear, if it clogged then it causes problems. Then move onto the other things on his list later.
take a look at clogged exhaust elbow. Its probably the least expensive and easiest to check. It should be completely clear, if it clogged then it causes problems. Then move onto the other things on his list later.
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Ted
Clogged Exhaust
A clogged exhaust elbow would cause unburned fuel (black smoke) and possibly an overheating condition due to decreased water flow. I believe it's best to diagnose before repairing. Please let us know the outcome of your visit with the mechanic.
A clogged exhaust elbow would cause unburned fuel (black smoke) and possibly an overheating condition due to decreased water flow. I believe it's best to diagnose before repairing. Please let us know the outcome of your visit with the mechanic.
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