Farmall 350 Diesel Miss

I have a Farmall 350 diesel that I rebuilt several years ago. I only drive it in parades and shows, but it just never has seemed to run quite right. I had the injector pump and injectors rebuilt (although not real inpressed with their work even though they are supposed to be a reputable place as they damaged an o-ring in the pump when they rebuilt it and it ended up filling my crankcase with diesel fuel). What it does is that it runs fine at idle and under a load (even a small load). However, when it is running at any speed over idle with no load it seems to miss on one cylinder. I would think that may be an injector problem, but I have never experienced that before on my other diesel which is an MD or any other diesel I have had. Roger

Crack each injector line when it is missing when it makes no difference, that is the problem cylinder. Swap injectors with the missing cylinder to see if the issue follows the injector. if not a compression check is next, but I believe it will be an injector issue. Jim

If you cannot trace it down to one cyl, think timing. I have had many guys bring in injection nozzles to be checked when it sounded like one cyl was miss firing when actually it was late timing scattering the miss all over the place. Just realize that a miss on one cyl will sound just like a fouled spark plug on a gas engine. That pump , according to the parts manual, has an automatic advance , same as almost all roosa master inj pumps. If that is not advancing you will have exactly the problem you are experiencing. Miss at higher speed, runs fine at idle and load. Simple window to install on pump and observe advance while running. Timing lights don't work well with roosa master pumps as it being a inlet metered pump it has constant end of injection but beginning of injection varies according to speed and load due to more fuel at higher speed and also more fuel at higher load so injection keeps getting earlier. Also, that is an energy cell combustion chamber, so the cell on the opposite side of the injection nozzle is critical also. If you do trace it to one cyl, compression or energy cell is most likely problem but I think it would miss at idle also if compression or cell.

I have a '57 350D with the Continental diesel that had a miss like that. It sat in the weather for 7 years so getting it going took some work. I had a wet stack for a while. I pulled the power cells out and found little carbon. I use treated fuel and have found the best treatment was to put it to some hard work all summer. It's starting to clear up nicely now, dry stack no miss under load. I am going to pull the injectors this fall as that is the only part of the fuel system I haven't gone into. One other thing to look at, the intake restrictor on my motor was not adjusted right. I adjusted it to specs and it did help some. PK