91 N14 Cummins intermittent miss

timc1134 · Nov 5, 2014

kennethc said: ↑

I have a n 14 cummins i rebuild the motor last June 2013 all new pistons bearings rods rebuilt 6 new injectors . last week i was coming through Louisville Ky headed to the house . motor started knocking . come home on the hook. about 180 miles $1150. started trouble shooting . i gould tell it was in the top of the motor . i pulled off the center head an turned the motor by hand # 3 and 4 piston comes up at the sane time . when i got it to the top and they started back down #3 moved down about a fourth of a inch be for # 4 moved when i looked at it the # 4 piston was at the top of the liner in front and in the back was down about a Fourth of a inch. pulled off the oil pan and # 4 piston and rod . and the piston broke off where the pin goes through. has anyone ever seen this . i been at this a long time never seen one do this. i have a pic of it o face book .
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sounds like a wrist pin bushing came out, check the oil pan for metal.

rebeloutlaw66 · Nov 5, 2014

I had a 92 Volvo with the n14, and it would miss sometimes and then run fine, it was very frustrating because when I would have it checked it would run fine so finally I did the old heat gun on the exhaust manifold and sure enough one cylinder wasn't getting as hot as the others so we changed the injector and never had anymore trouble, its amazing what 1 injector will do

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