Injector Pump - B2100

[Rich_S]

Hi all,

just wanted opinions on working on an Injector pump for a B2100:

I am trying to sort out a loss of power on my tractor and amongst other thoughts, it is possible that the injector pump is not working properly.

I have two choices:

1) to buy a new pump off the shelf from Kubota
2) Pull out the old one and see if I can get it restored to it's former glory.

Not knowing a great deal about these pumps my question is;

would a non-mechanic be able to change out the pump without having to do any work on further settings or does it require both the tractor and the pump (whether restored or new) to do the work?

For an old tractor like the B2100 does it complicate the restoration with the potential parts that might be required or are the parts readily available through distributors and a specialist should have no difficulty making it "new"?

If it's just a question of unscrewing the old pump and swapping in the new, I am happy to do the work, but if it requires a whole bunch of additional settings to be checked and balanced, then a rebuild of said pump may be the better way, along with all the labour costs that this entails.

What's the best way forward?

 

[rentthis]

Considering the price of a new injector pump, it's a good idea to have your local diesel guy check it first. If it's bad, he would probably be able to save you some money by rebuilding it. That pump is best left to the pros. It will require settings that you might not understand. Timing etc. The injection pump is one of the things to check later in the power loss situation. If you will post what you have tried to this point, age of machine, hours, service done etc, someone here will give you a good starting point.

 

[Rich_S]

Considering the price of a new injector pump, it's a good idea to have your local diesel guy check it first. If it's bad, he would probably be able to save you some money by rebuilding it. That pump is best left to the pros. It will require settings that you might not understand. Timing etc. The injection pump is one of the things to check later in the power loss situation. If you will post what you have tried to this point, age of machine, hours, service done etc, someone here will give you a good starting point.

thanks for the help - I wasn't intending on rebuilding it myself, just finding out if it was simply a case of swapping the old one for a new one (in the first instance) or if by swapping out the pumps there was a whole load more settings that needed to be made once the original pump had been moved.

My problem is not having particularly good local garages so the whole operation becomes much more complicated if I have to take the tractor along as well as the pump.

 

[rentthis]

Rich, It would be easier to take the tractor somewhere with the pump on it and running than it would to get it to the shop when you find that you can't move it after having tried to replace that pump. If you can find a workshop manual for the tractor It would likely lead you through the installation. My concern is that you might be getting ahead of yourself and it not be the pump at all. Injector pumps obviously go bad but my experience is that they are one of the more reliable functions of a diesel engine. There are several less reliable (and cheaper) functions that can cause the same symptoms. One that comes to mind is bad or clogged injectors. It could be as simple as a small air leak in the fuel system or clogged filters. If you will give details, someone here will point straight to the problem.

 

[Rich_S]

Rich, It would be easier to take the tractor somewhere with the pump on it and running than it would to get it to the shop when you find that you can't move it after having tried to replace that pump. If you can find a workshop manual for the tractor It would likely lead you through the installation. My concern is that you might be getting ahead of yourself and it not be the pump at all. Injector pumps obviously go bad but my experience is that they are one of the more reliable functions of a diesel engine. There are several less reliable (and cheaper) functions that can cause the same symptoms. One that comes to mind is bad or clogged injectors. It could be as simple as a small air leak in the fuel system or clogged filters. If you will give details, someone here will point straight to the problem.

Well, so far I have cleaned the fuel tank, changed oil/air/fuel filters, had the injectors cleaned to no effect. I am left with cylinder compression, timings and diesel injector pump unless there is something else I should be looking at? I suppose I could change the fuel pipes, but there does not appear to be a problem with engine getting fuel as it starts first turn (lots of smoke though) but recently when put under load it struggles, to the point of stalling. The terrain and jobs that I ask of it have not changed, but the available power has.

The local garage has not done a compression test, which others on here have said might be a good starting point, so have that in my back pocket as somewhere to start but from there I just wanted to know if the injector pump (whether restored or new) was a straight forward swap or required major adjustment which only a qualified shop could do.

 

[bh115577]

If you decide to have the injection pump rebuilt make sure you leave the shim, or shims, with the engine and don't take it/them to the rebuild place. They look like a metal gasket and sit between the injection pump and the hole it comes out of in the engine and you'll need to reuse them at install.

Have you done the fuel line crack test at the injectors to see if you may have a bad injector? Cleaning them doesn't always take care of an issue unless they were removed and rebuilt. It could be dangerous if you get near the fan or belts while it's running so I don't usually recommend it unless someone is confident in their abilities.

 

[Rich_S]

Have you done the fuel line crack test at the injectors to see if you may have a bad injector?

no, I haven't done this - sounds like it's a tricky thing with dangerous fans/ belts etc and engine running right?

 

[Lil Foot]

You might also check the valve clearances, mine ran noticeably better after adjusting the valves.

 

[bh115577]

Engine running, yes.

With the engine running at idle you slightly open the line at the top of the injector, one at a time. Should be a 17mm wrench. If the injector is good, or at least fair, the engine will stumble. If you get one or more that don't make the engine stumble and idle stays the same then you've found an injector that needs some help or the plunger in the injection pump that feeds that injector has issues.

If loosening all injector lines, one at a time, make the engine stumble about the same amount then your issue is likely not an injector.


BE CAREFUL AND STAY AWAY FROM MOVING PARTS AND DON'T OPEN THE LINE ANY MORE THAN YOU HAVE TO.

 

[Daren Todd]

Wear a pair of safety glasses when cracking the injector lines. Diesel will spurt a little

 

[michaeljbergey]

loss of power is more likely to be a plugged fuel filter. try that first

 

[North Idaho Wolfman]

loss of power is more likely to be a plugged fuel filter. try that first

I really hope he's already fixed it 3 years later.