Cummins L10 problems....

[LKCONCRETE]

Have a 93 L10 - 300 (non celect) upon startup it smokes and runs rough, once warm it smooths out and no smoke exept on load. Strangly when i use the block heater it does not smoke for the first 5 mins of start up but then starts to run rough again and smoke until warm....???

could the thermostat cause this? Hoping its not major like a leaky head gasket, or injectors, though the engine consumes no oil or coolant, and there is no evidence of water in the oil....

any help would be great

[sdan27]

We have a tractor on our farm with a '92 non-electric L10 as well. We had similar problems that turned out to be a problem with the fuel pump. We did fuel pump and injectors at the same time and that helped it out a lot. Might be due to have the injectors gone through. I don't think that the thermostat would have anything to do with the symptoms you describe either. Ours probably had about 4000-4500 hours on it at the time. Definately hard hours though.

[Stewey]

More than likely an injector(s) problem. You'd have white smoke pretty much all the time if the thermostat was stuck.