1130Lilshive
New member
I have been wondering the vast lands of google looking for some answers on my yanmar injection pump, I've seen some threads on here before that have been created by very knowledgeable mechanics so I thought maybe i could ask them a few questions and TAh DAH here I am. Ok now that's out of the way here we go, I have a Yanmar 3TNE68 I am modifing for garden tractor pulling and I have hit a dead end on what I could do. This engine was donated to me for this purpose with the sole request to see what it's capable of so I'm not afraid of blowing it to pieces. So here is what I've got done so far, i have advanced the timing 3 degrees. I have the fuel screw backed all the way out and the rpm limit screw done the same I tacked it at 4420 rpm. I also have a fuyan SJ-44 turbo on it that makes 8-10 psi of boost. The turbo is too big for the engine so I'm trying to build the engine up to the turbo if that makes any sense. My biggest problem is I need more fuel. With the pump already at its current limit I'm not sure what to do. One guy told me to send it to Columbus Diesel along with $2,000-$3,000 as he did his but I don't have that level of money to dump in this thing. So here is my big question I know the injection plungers and barrels are easily removable in this engine so could I swap out the plungers from a larger engine like a 3TNE84 with an inline pump? I've tried to find out if they are the same but with no luck. If I can get more fuel to it I plan on porting and polishing the head and having a cam reground for it. Any help is greatly appreciated.