Posted by jdemaris on August 09, 2013 at 14:56:55 from (70.215.10.74):
In Reply to: Re: B275 diesel posted by Glenn D on August 09, 2013 at 13:47:53:
Without hearing it - it's hard to even guess. Like any internal combustion engine with multiple cylinders - rough idle can be from one of the cylinders not firing the same as the rest, or an overall problem with all four at once.
With a diesel - with an inline injection pump - there is a separate injection pump for each cylinder. So, one bad fuel injector pump can make one cylinder weak, skip, or whatever and cause a rough idle. A diesel with a rotary pump cannot suffer that same problem except in extreme rare cases (scratched head & rotor or a bad delivery valve in a CAV rotary).
Seems you need to ascertain if it's an overall "running rough" or just one cylinder skipping.
With your tractor and the in-line pump-box with four pumps in it - there's not much that can make all four cylinders run rough at idle and smooth out at higher RPMs. Very worn injector nozzles will often leak and dribble at low speeds and work better at high. So, could be a worn-out nozzle. Could also be valve adjustment.
You can try cracking an injector line loose (at the injector), one at a time with the engine idling and see if any specific one makes less difference then the rest. That would indicate one cylinder skipping.
The injector pumps could also be out of adjustment. All four has an adjuster on them to set fuel delivery. I've done a few with crude tools.
Also - on the B275 - there are moving mechanical parts in the air-intake manifold along with a diaphram in the back of the pump box that can go bad and make the whole thing run lousy. One year - one of my 1960 B275s ran lousy and I found a mud-wasp nest inside the air intake manifold blocking the governor butterfly valve. The next year - they did it AGAIN. finally put a fine screen over the air-intake to keep the little b*stards out.
Like I said, hard to guess without hearing it. I've come across many lousy running B275s and most needed engine rebuilds due to too much ether being used to start them. Luckily, parts are cheap and easy to get. Last one I rebuilt- the pistons, rings and cylinders came from this Website.
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