Posted by MHMalcolm on July 14, 2009 at 15:17:44 from (66.66.148.252):
In Reply to: D-239 injector pump posted by Bill Allis on July 14, 2009 at 11:14:30:
It definitely sounds like a fuel related problem. I can't remember if this was mentioned on your earlier posts, but I have seen the spring loaded metering needles in injectors with alot of hours on them start binding and opening at too high a pressure, or stick open after the engine has gotten good and hot. But they work OK with a cool engine and on the pop tester. I guess I would start cracking injector lines when it starts running rough and see which one or ones affect the running the most. The worst problem with your situation is that it only does it under load, making it difficult to do that. You would really need something with a constant PTO load, like a dyno, to do it. The only other option is to have the injectors rebuilt, which might not be a bad idea anyway if the tractor has many hours on it, and if that doesn't take care of it, pull your injector pump and have it rebuilt. I had a MF 298 with a CAV pump that did this same thing, now that I think about it, probably over 20 years ago. After testing injectors, checking valves, compression, etc., I began to think that maybe the advance piston in the pump was sticking when it got hot. I pulled the pump off and had it rebuilt and it has run fine to this day. Sorry this is so long, but I started remembering things while I was typing. Good luck.
One more thing you might try if you haven't already is adding diesel fuel conditioner to your fuel. Todays fuel doesn't have the lubricity it used to in the old days and I don't dare run anything without conditioner these days.
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