B275 diesel getting too much fuel

I have a B275 diesel that I just rebuilt. New everything in engine. It starts fine and runs fine. Just a few issues. Every since I bought it. The engine speeds up when going down a grade ( a lot) . I have to lower the throttle and hit the brake wile in gear to slow it down.It has sit for 4 years before the rebuild.I reused the old inj. pump and injectors. I finished the rebuild and it is getting to much fuel when running at idle. It will keep speeding the engine up and I have to hold the kill knob out and it will finally die after a long wile. sometimes I have to cover the air filter intake to kill it. It smokes white and black smoke. You can smell the diesel a lot in the smoke. I can hold the kill knob out just a bit and it will stop smoking. Is this an injector issue or a pump issue? It has the inline CAV pump with the air gov. I have checked the diaphram in the gov. it is soft and pliable feels kinda oily wet. The air gov. and throttle section of the intake was stripped out where the two lines for the gov fit. I have drilled out the old taper fittings in the piece all the way through even the little tubes inside the air chamber (both of them) and replaced it with brass fittings 1/4 pipe to 1/8 tube with taper ferrel inside. fit great and seemed to work well. but no little short tubes in the air chamber Does it have to have the two little tubes sticking up in the air chamber section. Can anyone help with these issues. other than that it is good to go.Rebuit everything clutches breaks seals the works, except the fuel system. Thanks in advance Jeff

I'm no diesel mechanic, but it seems logical that since you didn't do anything to the pump or injectors, and you're still having problems, that the problem lies in the pump and/or injectors.

I'd get the pump done regardless. I believe you can take the injectors to a diesel shop to have them tested.

As far as speeding up going down a hill, that's normal.

You ARE keeping the pump full of oil, correct?

You need to look closely when the engine is revving up and see if the air-shutter governor linkage is actually moving, or not. If it IS moving when it shouldn't be, then there's your answer. If it's NOT moving when the RPM changes, then you've got internal pump problems . . . or . . . air in the fuel.

It sounds like you've got worn barrels and plungers in the injection pump. That will make shutting it down difficult. But, it also can make it start hard when cold. Keep in mind though, that the injector rack being out of adjustment can cause the same. You can pull the trap door off the side and see if they are closing fully when you pull the shut-off lever.

How fast does the oil reservoir fill up with diesel fuel from leakage?

If you rebuilt the engine, did you put new injector nozzles in? It's standard procedure. It's NOT going to cause the problems you mentioned with RPM though.

You can buy all the parts for that injector pump from several places in England. Not many shops in the USA work on them, and if they do, they charge a fortune for the parts.

Here's a list of all the parts needed to rebuild the pump. I suspect it won't be long when they won't be available anymore. Cost is in British Pounds.

4pcs Element 7033-462H @ £15.00 each.. £60.00
4pcs D valve 7033-359 @ £6.50 each..£26.00
4pcs D valve seal. 5936-22 @1.50 each...£6.00
4pcs D valve Holder 7032-3 @ £10.50...£42.00
Carriage...£8.50
Governor diaphram ... £20.00

I do agree with you but I am trying to figure out if pump or injectors as there is quite a price diff in the repair or replacement of each. cash is kinda tight right now. I also agree with the down hill thing. My hill is not really a hill just gentle slope. I don't think that the engine should speed up over half throttle. It is just too much RPM gain for the small slope. Thank you JF

I think you'd be nuts to take that pump to shop. In-line CAVs are oddities in the USA and it's likely you'll get charged a small fortune.

The nice thing about that pump is . . . you can fix just about anything on it without even taking it off the tractor. Basically, all it is is four small plunger fuel pumps riding on a camshaft.

I'd just about bet that there is either a hole in the diaphragm, or an air leak in the pipe between the pump and the inlet manifold. sounds exactly like the rack is going in too far and not returning unless you pull the stop. the rack must be free by the sound of it, but it seems that the vacuum system is not pulling the rack back. Pull the diaphragm right out and have a good look at it. plus make sure that the diaphragm is seating nicely in the chamber on clean surfaces.
All the best,
Rex

thanks for your help. I have had the inspection plate off and filled it with oil and checked everything. The plungers were stuck before I even tried starting it up. but I worked them and oiled them and they are free and easy now. I agree on the pump repair cost part. I am trying to take care of this issue inhouse as I hate to pay someone to do things I can do myself especially at their prices. JF

I will try and get to it tomorrow when I get home Thank you for your help. JF

I will have to check the butterfly to see the movement. I put oil in the pump with the side cover off thats all. I have ran it with the side cover off of the injector pump and it don't have any fuel dripping from the pump. even after quite a wile of running at high idle and more. No new nozzles yet. That will most likely be my next step. Mostly concerned with the over fueling issue right now. Thinking the injectors may be stuck in full open possition. Will try and get to this list this weekend. Thank you JF