I have a Cummins M11 on a 2007 Woodsman whole tree chipper. The fuel is getting so hot that you can't touch the tank and the oil dipstick is blowing out of the tube on the side of the engine.
Engine: 400 hp Cummins M11
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Hi my name is XXXXX XXXXX X see this question is still unanswered. I will try to assist with thought on what might be happening. Since the fuel is getting very hot I was thinking you might have a problem with the injector cups, or injectors leaking exhaust gas back into the fuel system. This would explain the heat build up, and I would also expect to see the fuel becoming darker than normal. In addition the fuel tank should have excessive pressure and or possible you could see bubbles in the return line for the tanks. WIth regards XXXXX XXXXX oil dipstick blowing out, I would wonder if the oil level is rising indicating the exhaust gas is also leaking past the injector cups and bringing pressure plus some fuel with it to cause excessive crankcase pressure. You could sample the oil to verify any contaminants. Another cause for this pressure is the turbo being worn allowing boost or exhaust to enter the oil sump via the return oil drain. One other important check is to make sure the engine breather tube isn't plugged which also cause high crankcase pressure. Hope this is helpful, These are things I have run into on other engines. Thanks, Dan.
Road service Mechanic for Volvo Construction Equipment
The engine has 1029 hours on it, so a worn turbo seems unlikely, but that may be the case. I think you may be on to something with the injector cups. I have a cummins tech coming this morning to check it out.
Hi thanks for the reply back, okay let me know how you make out, I'm interested as well. Thanks Dan.