Help on a miss on a Mechanical N14-STC engine

When engine is cold. Start it and right away take a laser temp gun and check temps of each cylinder at the exhaust manifold. Look for a cold one. keep checking temps and look for a big difference. But must due this before it gets to warm and heat soaks the complete manifold.

 

Do as he says to locate a dead miss if that is your problem.Can also be done with your hand,if your quick,and don't have a temp gun. A mechanical N-14 is a great very simple basic engine. Probably as simple as a bad injector,easily and fairly inexpensive to replace as it's not computer controlled. Would be a good idea to check all filters,esp. air,since you have no history on the engine. You can also pull your valve covers,check your rack adjustments.

 

I would start with a clear hose inline on the fuel pump supply line. Sucking air? You can make one with reuseable hydraulic hose fittings and clear hose from the hardware store. Double clamp each end, bands are better.
Then a 300 PSI gauge connected to the side of the shut down solenoid. What does it read as it stalls?

 

Its sucking air. Go over everything from tank to pump.

As boxcar said .

 

OR MAYBE 4,5 and 6 are getting most of the air.

 

Well it shows a difference. Now something I don't Know. Does it have a dual fuel line from pump to front head, and rear, or just front, or just rear. It is steel. There is one return. Being that its a group cylinders. I would look for lines sucking air, and check fuel psi. But I think i would first take the line of before filter head and change fuel source. It works on suction on that side of pump. So just drop a line into a fresh clean supply of diesel. 5gal bucket? Recheck temps and performane. You should Isolate which side of pump the issue is. Chassie or engine. Be prepaired for the fuel tank on a old lo milage truck to be full of crap.

 

So should I tell you to just replace the lines and go into great detail of why or do you wanna just ask your confident mechanic next door? Thank You.