CJLennon
Well-Known Member
Folks, as always, thanks for all the help with these Cummins engines. We have an 855 Cummins, 400 hp, and the engine developed a miss. We pulled the injectors and found a lot of metal to metal wear so we replaced them. Made no difference. We also purchased a compression test adapter for the 855 engine and took a compression test. We got a low number of 320 psi (cyl. #3) up to a high number of 460 psi (cyl. #4). So, the first question is, what should I be getting as far as compression goes? Next question, what strategy do you use on these Cummins engines when you have a miss and the valves are within specs, the injectors have been replaced and their travel set at .175, and the fuel filters have been replaced? At least with the other engines you can crack open the fuel lines and figure out which cylinder you are dropping. How do you go about diagnosing a problem with these 855 engines?????:Banghead As always, thanks to any one that can educate me.
Chris
Chris