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
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