Has anyone had experience rebuilding an injection pump? I bought a kit and I have a detailed procedure to follow but I don't know if I am going to run into peculiarities that aren't covered in the text. If anyone has experience rebuilding these please offer advice. Since the kit only cost $25 for the seals I figure I have nothing to lose. This pump is off an 86.



Jody

Rebuilding an IP involves a complex, extremely close tolerance piece of equipment.

Resealing the pump to stop external fuel leaks can be accomplished by carefully following the instructions in your detailed procedure manual.

As for rebuilding/remanufacturing an IP to original specs and calibrations, that is another matter best left to a pump shop that has the proper equipment to complete the task and test their work prior to installing it on an engine.

It depends on what you want to accomplish and what problems the pump has. If it's worn and exhibiting starting/running problems, it's doubtful that a kit would solve all of the problems. Most often these units require some hard parts, resizing and recalibrating in order to make them work as intended.

I have a detailed procedure to follow but I don't know if I am going to run into peculiarities that aren't covered in the text.
Jody

There is only one way to find out. Just doooo it.


Advance piston is usually worn out and requires reaming the housing and fitting an oversize piston. Hmmmmm? Betcha don't got that in no kit.

while i have never reuilt an IP myself . i do know that i would much rather pay the $250 to have it rebuilt by a reputable rebuilder, as it goes beyond my comfort level in tinkering LOL

I'd try it. I've been wanting to for a long time, I just never really had the need to.

I do know there's a lot more to it than just replacing seals though. From the research I've done, and taking apart a pump or two, I'd say DieselPro hit the nail on the head. The tough part will be making the advance piston work right.

Do you know what was wrong with the pump to begin with?

Diesel Pro's right. Having resealed many of them, I start by removing the advance piston and inspecting for scratches, scores and wear. If it shows any sign of wear, the pump goes to the pump shop. I usually stop at replacing the external seals, throttle shaft bushings ( I have the reamer to resize them), and the advance cam pin and seal. If that won't fix it, it goes out for repair and recalibration.

I'd try it. I've been wanting to for a long time, I just never really had the need to.

I do know there's a lot more to it than just replacing seals though. From the research I've done, and taking apart a pump or two, I'd say DieselPro hit the nail on the head. The tough part will be making the advance piston work right.

Do you know what was wrong with the pump to begin with?

I believe that the inlet is either clogged or the fuel shutoff valve is stuck. It won't pump at all but there is fuel in the bowl. I believe that the fuel shutoff switch should move freely in the bowl. The one I am referring to is the mechanical one that is actuated by the electric solenoid. The solenoid works fine but when there is fuel pumped and the bowl is full I believe fuel should come out of the overfolw but it is not which leads me to believe that fuel is not making it past the fuel switch. Anyways, I have two diesels, an 86 with a bad IP and an 89 which threw a rod through the oil pan 30 seconds after I started it. Now that I know the 89 has a good injection pump I will probably just take it off of the 89 and put it on the 86.

Another question - If I had a choice between 86 or 89 heads, which ones should I use?

Those pumps are not difficult to rebuild but if you replace many of the hard parts internally,it will run fine again.I bought a new metering valve,EID governor cage,transfer blades and liner,cam rollers,cam shoes and a full o-ring/seal kit and the pump runs just perfectly.My pump did'nt have the advance piston/bore problem so it runs just fine.I bought my parts from a place in Texas.If anyone is interested where to buy the parts at decent prices,feel free to send me a PM.

If your pump is not spraying any fuel,you could have a badly clogged inlet screen or your problem could be linked to stuck pumping plungers in the base of the rotor.I've seen this happen many times.Fixing that problem is very easy.

dieselolds,how do you do those repairs?