I did a complete o/h on a n14 c+ around 2 years ago. It has gone through at least 3 sets of injectors and probably threw a rod today. This was a no expense spared overhaul literally every moving part was looked at and had new crank and cam injectors and everything else typical of an out of frame overhaul. My understanding is that the last injector failure destroyed one hole. I did not see it and it was done by another shop because the truck has changed hands. Now unfortunately it was purchased by a friend of mine about a week ago and something let loose on him today that caused oil to leave the engine and makes really bad noise when he tried to restart it. I am wondering if it ended up with a bunch of fuel in the oil and caused a bearing failure. I guess the bottom line of this long story is does anyone make a reliable injector for these engines at this point. Most of the injectors were replaced because of missing at low load/rpm but probably 5 total had more serious failures
This is all in approximately 350k miles. I even paid the freightliner shop to put a new set in it which seems to have turned into a smear against me because I apparently don’t know how to run the overhead and set injectors but the set they put in has had at least as much trouble as the ones I’ve done.
N14 injector problems
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by W923, Mar 24, 2023.
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What is Cummins ReCon?
New Cummins engines are built with remanufacturing in mind, enabling them to have a long and fuel-efficient life. Up to 85 percent of an engine can be remanufactured, and Cummins engines are built to be remanufactured multiple times.
Cummins ReCon parts and engines have gone through disassembly, inspection, cleaning, calibration and testing to ensure they meet the same specifications as new Cummins parts or engines.mile marker 27, Rideandrepair and W923 Thank this. -
I have a post on here about ISM injectors somewhere. It has good info about injector replacement from trusted sources.
Rideandrepair and W923 Thank this. -
Rideandrepair Thanks this.
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Rideandrepair Thanks this.
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What micron filter was used?
When I had a N14,I would dump a gallon of two stroke oil in the fuel every couple weeks.mile marker 27, W923 and Rideandrepair Thank this. -
I honestly think most of the failures have been on the electrical side and not mechanical -
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