thats because it is just a spring out of a marine pump or some other pump that happens to have a 3200rpm defueling point, someone just did some research to figure this out. So you are kindof ordering blind, but you just have to trust the good people on this site who have done this research!

 

and trust us it works

 

I do, its in my console, just need to find some time to put it in! Its really hard to find some of that!

 

I know what you mean

 

If the 3200 is not enough I have a VE spring in my marine pump that is for 4600rpm defueling. That is if the cummins will hold up to that.

 

what are the #'s on the tag for that one? this could get interesting.

 

the spring # i used is 1464650366..i was one of the first. it took me months to get bushy to try it. ask him. the simple things do more for our trucks than any of the complicated and expensive things do. i do not know anyone on this board that would steer ANYONE wrong about what makes these trucks come alive. the spring cost me 15 bucks from cummins.

 

Jughead is correct, it did take some time to convince me to try this mod....my hesitation was based on the facts that it was not widely used and no "volume" of assessments/data/results and, most of all, the nervous factor....that is probably the single biggest factor to making more "in depth" changes when it comes to these pumps/trucks.
I will say, that once the change was made I was very please with the results...it helps to hold/pull heavier fueling levels right up to the physically governed limits as set by the governor screw and has greatly reduced the influence of the governor counterweights in the pump to pull the fueling back.


pb....

 

Yes sir, time to tear into that marine pump you have there, and get the last three or only three numbers on the governor spring. We might actually get us a new spring number to try out... find out if that 4200rpm gov spring really does exit .....

 

Well in the MD41 Volvo diesel I rebuilt it for its set to defuel at 4600rpms. If you keep pushing it it will sometimes slowly get up to 4900. I wonder id there is any other difference in the marine pump and stock cummins.

At least i have a pump to tear down and try things with before i do it to the one on the truck. I would just swap the gov spring over, but i dont want to over rev this old motor and blow it.

 

Definately fill us in if/when you tear into it for the spring number. Don't worry you won't over rev it, just ask NeedMoPower, he's using that spring in his .

 

dont these engines start to come apart at 5k rpms? If not balanced that is.

 

even a pump # would be good. could take that to a bosch shop and they'll be able to get the spring for it. and you wouldn't have to listen to the old "well, THAT won't work. prolly shouldn't even sell it to ya" routine.

 

I'll go out in the morning and look for a pump number. I have the full service manual for it too, I bet that has some part numbers.

 

nice! you will make many happy.