Diesel specialist=what do you think?

Forum members,
A few days ago I received solutions for a slight rise in rpm on the HD3 Allis. I have also received advice from another forum. New filter is being recommended by this forum. I like this forum's cure. The other forum is saying it is a flex ring. What do you think?? Any and all thoughts welcome.
Mr. T. Minnesota
 
Best to check the simple thinks first, a good fuel flow to the injection pump is a must have, and a filter service may be needed. If all is well and the speed is still erratic at times then I would suspect the injection pump. Just repaired an Oliver pump for the same trouble.
 
If you want more useful information, you need to give more information. The plastic governor dampener inside the D-series Stanadyne-Roosamaster injection pumps always fails. It's just a matter of when, not "if."

If you have such a pump (you haven't given a model #) . . . a few simple checks might help. Like pulling off the timing window and inspecting for failed-ring debris inside? 10 minute job.

In regard to symptoms - a rotary mechanical injection pump like your's MUST be full for fuel to work properly. If it gets air inside - the throttle won't work correctly, the shut-off won't work right well, nor will it run smooth and have good power. The pump is self-bleeding and will suck fuel to itself. Can't do that with an obstructed fuel feed though. If obstructed, it can start drawing air. That injection pump does not need a fuel pump to feed it - but if there is one, it must be working or at least letting fuel pass.
 
I would try cleaning the bowl.checking the flow and replacing the filters first and then go from there,the governor vibration damper was an optional extra back when that machine was new and it may not even have one,if it has one it would probably been changed how many times?,if it has it and it's crumbled again there will be telltale signs of mouse like turds esp blocking the outlet valve.
P
 
Yes that pellathane plastic ring on the governor flyweight cage was called "optional" by Stanadyne. That being said -I've yet to pull apart a D pump from an Allis Chalmers, Ford, Oliver, Case Hercules, or Deere from the early 80s or older that did not have it. Same goes with Ford and GM cars and trucks before 1985.

As far as the presence of the little "mouse turd?" All depends who has had the machine before you and how hard they worked to clean them out and keep running. I've had a few with NO turds left and the governor just hammering metal against metal - until the pump crapped out.
 

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