I just finished changing the fuel filter on my yanmar diesel engine. Got the engine started after venting the air. Engine runs fine when idling in the slip. When I put it in gear and motor out of the slip I get thick dirty white or grey smoke. I've checked the fuel filter and vented again and still get the same results. Any ideas or suggestions would be appreciated.
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it's not the filter
If there was air in the lines or filter, it would be obvious - engine would die. It might help if you could provide more info, i.e., engine? does it run up to full rpm?, other anomalies? which filter did you replace (primary or secondary)?, same filter element as before?
If there was air in the lines or filter, it would be obvious - engine would die. It might help if you could provide more info, i.e., engine? does it run up to full rpm?, other anomalies? which filter did you replace (primary or secondary)?, same filter element as before?
feel injectors
I had the same problem. My fuel injectors needed to be cleaned. It cost $50 each to clean and replace the O-rings. I removed them myself.
I had the same problem. My fuel injectors needed to be cleaned. It cost $50 each to clean and replace the O-rings. I removed them myself.
Yanmar Smoking
As Don says, more information is needed to help much. For sure, you do not have air in the lines. Air means it won't run. Which filter did you change, or did you change more than one. The Yanmars have a little 2 micron filter on the engine, between the lift pump and the injector pump. Will it turn up full RPM? Will it turn up full RPM in neutral, but not under load. Have you checked the bottom to see if it is fouled? Generally black sooty smoke is the result of an engine not being able to turn up full RPM. This can be caused by a dirty bottom, wrong prop, etc. Not the result of a restricted fuel supply. Dirty injectors can cause a different set of problems.
As Don says, more information is needed to help much. For sure, you do not have air in the lines. Air means it won't run. Which filter did you change, or did you change more than one. The Yanmars have a little 2 micron filter on the engine, between the lift pump and the injector pump. Will it turn up full RPM? Will it turn up full RPM in neutral, but not under load. Have you checked the bottom to see if it is fouled? Generally black sooty smoke is the result of an engine not being able to turn up full RPM. This can be caused by a dirty bottom, wrong prop, etc. Not the result of a restricted fuel supply. Dirty injectors can cause a different set of problems.
How was it running before you replaced the filter?
Dirty white smoke points to low compression, leaking or in need of adjustment engine valves or faulty injectors. Most of the symptoms should have been present before; if the engine was running fine before, then bad fuel would be a suspect.
Dirty white smoke points to low compression, leaking or in need of adjustment engine valves or faulty injectors. Most of the symptoms should have been present before; if the engine was running fine before, then bad fuel would be a suspect.
white smoke is ....
Water in the exhaust (yea got, that is it cold outside?) or totally unburned but atomized fuel. Since you just changed the filters (did you do anything else?) that would speak to an injector sticking and injecting too much fuel. Does the engine run rough? Does the exhaust smell of diesel? If it does one or more of the cylinders is not firing. The likely cause of white smoke is poor compression but changing the fuel filter will not effect that. Which leads me to think there is too much fuel being injected. Like an injector that has a piece of grit in it and is not closing properly. Where you practicing surgical clean room procedures when changing the filters and bleeding? You cannot let dirt get into the system when preforming maintenance on the fuel system. A dirty bleed screw is all it takes to suck some dirt in!
Water in the exhaust (yea got, that is it cold outside?) or totally unburned but atomized fuel. Since you just changed the filters (did you do anything else?) that would speak to an injector sticking and injecting too much fuel. Does the engine run rough? Does the exhaust smell of diesel? If it does one or more of the cylinders is not firing. The likely cause of white smoke is poor compression but changing the fuel filter will not effect that. Which leads me to think there is too much fuel being injected. Like an injector that has a piece of grit in it and is not closing properly. Where you practicing surgical clean room procedures when changing the filters and bleeding? You cannot let dirt get into the system when preforming maintenance on the fuel system. A dirty bleed screw is all it takes to suck some dirt in!
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