N14 missing under load at 1400 RPMs

Take a engine.

Put a pencil on top of the cylinders at the head of that engine. Each cylinder when rolling nicely (Valves etc) have a certain feeling through that pencil to your fingers. When you come across a cylinder that is LAZY or Valves trouble it will "Tap" at you through the pencil and show it needs more investigation.

The problem I have is my post is theory because I never penciled a big truck diesel that is not feeling well and it might be worth a shot to see.

 

I'd guess injector issue. As n14 injectors are known to crack tips. But when in shop you may want a blow by test done. With manometer will tell you if your engine is on the way out.

 

Please keep this thread going when the issue is resolved. There only seems to be a handful of us on here with these N14's and any info we post when we have problems could sure help others out.

These are some dang good motors, and pretty simple to work on. I'm interested to see how this one turns out.

 

When was the last time the overhead was set?

 

I am also interested. I had a similar engine once long ago and it would be worth learning it's fate in this situation.

 

Ok, wiring harnesses. Do they have them for your rig and what would it take financially to replace it? You cannot risk the gremlins growing in the old one.

 

Just resolved a similar problem. Motor would run rough at higher rpm. Cracked filter head. Air was getting in fuel just before pump.

Injectors are easy to replace. Kinda like spark plugs. Make a tool. The injector has a hole in the body you insert this tool.
I took old screw driver. Small diameter shaft 1/8" I think. Grind tip to a point or blunt end. 1" from end bend to a 90° angle. The shaft to handle is about 3", this allows me to insert tool into injector and use pry bar to pull the injector out.

Tool for eps take deep well socket. 1/4" grinder and make a slot up the length of socket wall.

Good luck.