Hello everybody. I am off the Cat 426 now and having problems with my 1976 International Tractor MD 2400 or could be a 2600? Anyway i have owned it for 26 years and never had any issues until recently. It has the 3 Cylinder Perkins diesel and its strong. The lift is slow but still acceptable. The real problem is this, it will all of a sudden start revving up high RPM's and then die. Wait a few minutes and start it back up and after 4 or 5 minutes it will do the same thing. I have changed both filters and installed an inline pre-pump filter and a really powerful electric fuel pump. Started it up and ran about 5 minutes and repeated the same thing. I have had small gas engines do that runaway thing when they run out of fuel but never had a Diesel engine do that. So i am stumped on out and hoping somebody out there knows the answer.
If it was surging a little and then dying, I'd think it was sucking air on it's way to running out of fuel. I'm not sure of revving up to high RPM's? I'd clean the tank, or run it off a temporary tank for testing purposes. Clean the whole fuel line, including taking apart all fittings and blowing them out. Replace any rubber fuel lines, those filters are notorious for leaking air too, but those are pressurized aren't they?
Governor coming apart maybe?
FYI. A runaway is when the engine can't be controlled or shutdown. Like when a diesel loses a piston and the engine oil fuels it. You will know when a diesel runs away. It sounds awful and it is follow by a catastrophic shut down. That sounds like you have a fuel control problem. I would check your feed pressure, make sure the return is clean. If nothing there then your injection pump is suspect.
Like edgephoto said, a runaway will not shut down. It will run high until it blows or the air supply is cut off. This could be a pre warning of what is yet to come. Be prepared to cut off the air supply should it happen. Many videos on this. Could be the injection pump, but I really don't know. Never use your hand to cut off air supply, use a board etc.
Perkins use a CAV DPA pump. And usually run off gravity feed.. 1-3psi.. if ur running a hi pressure pump TO the pump, disconnect it.. A pic of the inj pump or # off the name plate would b helpful..
OK. I see the replies so far and understand the difference of runaway vs temp high RPM's. The problem existed before i installed the electric fuel pump which is why i figured a fuel pump would solve the problem, but didn't. When i activate the pump i can hear the fuel returning to the tank so i know the return line is clear. I read somewhere that there is a checkvalve somewhere in the system that sometimes clogs up and will not allow fuel to go to the injector pump.??? I looked at my system and if it has one , i can not see it. problem is, i really do not what to look for or where to find it. Bottom line is, it is running out of fuel and dying. Fact is , BOTH fliters have fuel. Problem is, that fuel is not making it to the injector pump by making a "bypass" somehow?
Yes, tried to take pics of injector pump but phone pics are very "wavy" like it has moisture in it. I did however get the numbers off it as follows: Line 1) BOSCH is brand, Line 2) 1320481 5 Line 3) VA3/1700H1100 BRG2 Line 4) 460303094 Maybe someone out there knows these pumps and what the problem may be.
The guy that posted (post 6) is the best you'll ever find on injection pumps! I think he wants the numbers off the injection pump or pics. of it not the lines.
That's what he needs. I've never seen a VA pump on a Perkins, but that doesn't matter, the pump could be on a Mongolian engine and it will perform the same as a JD, Perkins or IH. I would try running it off a temporary tank. Since it repeats regularly, it should be easy to diagnose if you can get it to run right off a temporary tank.
LOL. this is off the pump data plate. There are 3 lines on that plate all with different set of numbers.
Done that and it makes no difference. It is getting fuel to the filters. The secondary filter is attached to the pump. It has a bleed screw on top and it has fuel all the time. There is something about that injector pump that is causing the problem. I am going to look for a filter in the pump itself. I am looking for a manual that will reveal all the secrets of that pump.
No pic but see my post below that lists all the numbers found on the data plate on the pump.
DO NOT MESS W THAT PUMP.!! There is nothing u can do to it to make it run..if it’s a pump problem.. Look on the back side of the pump, opposite side of the throttle.. are there any wires.?? Some VA pumps had solenoids on them..
OK. Advice well taken. Am not a pump person and do not understand how they work anyway. SOOOOOO, i have located what I think the problem is. It is AIR getting into the system, not sure how but after it stops running i open the bleeder valve on the pump and air comes out. Lots of it. So question is, how is the air getting into the fuel lines? Next procedure is to get it running and start by bleeding the filter close to the pump to see if there is air there. If there is air i will go to next filter and see if it bleeds air. If there is air there then it has to be coming from the fuel tank area?
you could post a pic or diagram of the fuel system, or the most likely issues are a blockage in the tank itself, either trash, chaff, plastic... or that trash has plugged somewhere downstream at a fitting usually. or the filters are leaking, the metal filter with the seal top and bottom that's tightened with a bolt is notorious for leaking. With no transfer pump besides the injection pump, all the fuel system and filters are under suction, right?
Anywhere the lines connect to each other is a possible air intrusion.. There IS a supply pump inside the injection pump..so if the filters r empty, that means the sp is pulling the fuel in but there’s a blockage in the tank that won’t allow the fuel to fill the filters.. I hope that helps..
Could b a bad, non vented fuel cap on the tank.. if u loosen it right before or right after it stalls, u should hear it sucking in..
My camera is broke and can not take pics. OK. problem solved. It was indeed a fuel supply problem but one that defies logic. The fuel tank is a very odd shaped one. It basically forms a "T" , looking from the back of the tractor. The tank looks like 2 saddlebags that straddles the 3 point hookup. It has a crossover tunnel at the top so when the tank is completely full, the fuel will flow from left to right. On the bottom is has a 1/4 inch crossover tube that is designed to keep the tanks at equal levels. The filler neck is on the left tank so when you take cap off you can see plenty of fuel. So all along i can see i had plenty of fuel. HOWEVER, i was not aware the lower crossover tube was blocked by something, possible dirt. So after it sat for awhile it would start and then run out of fuel. Then the whole thing would happen again.
Kool.. good thing it wasn’t the pump..$$$ Next time your at the hardware store, pick up 4, 12mm id copper washers for the inlet and outlet bolts.. u know you crushed the bajesus autta them.. lol Glad u fixed it..