Mack and John Deere injector pumps interchangeable?

[BronsonA2150]

They’re the only 2 that use inline pumps that mount on the right side of engine I can think of and it appears they’re both right hand rotation. Just not sure how the drive and front structure mounting are on both. Don’t ask me why I’m asking! 😁 

[Vladislav]

There were plenty of different injection pumps used on Mack engines during a few decades. I mean 6 in-line. In the most cases they were made by Ambac and Robert Bosch. Two types are different types by the design and fit also. Each brand produced I guess about a hundered or more particular pump mods for different Mack (!) engines. With different stroke volume, different max revs limit and different settings in the governor. 

So if you find out a certain John Deere engine uses a pump of similar style a certain Mack has there are minimal if any chances on full interchangeability. 

[BronsonA2150]

15 minutes ago, Vladislav said:

There were plenty of different injection pumps used on Mack engines during a few decades. I mean 6 in-line. In the most cases they were made by Ambac and Robert Bosch. Two types are different types by the design and fit also. Each brand produced I guess about a hundered or more particular pump mods for different Mack (!) engines. With different stroke volume, different max revs limit and different settings in the governor. 

So if you find out a certain John Deere engine uses a pump of similar style a certain Mack has there are minimal if any chances on full interchangeability. 

Well I haven’t done much interchanging myself. But to my understanding there isn’t really much to it as long as firing order and rotation is the same as well as mounting side I’m assuming. For instance I know Cummins and IH pumps are interchangeable you just have to add some hardware to the front of the Cummins pump to go on an IH where case and John Deere do not go onto IH with much ease. I’m just unaware what is on the front structure of a Mack mechanical as I’ve never had one off

[Vladislav]

Basically there's a cast adaptor housing and a Morse cone shaft end. You fit a coupling cap with internal splines on it and it mates to a splined tube arranged on the engine side.

But as I said there are plenty Mack pumps with different settings and I know people tried using a pump from a different engine model (power, year) and got wrong operation.

Also for  example a few engines used both Ambac and Bosch pumps. And you could swap one with the other having the correct attachments. But Ambac pump sets with 19 degree initial timing angle and Bosch with 23. For which reason? I don't know.

As I said there are much more nuances than you would like to explore swapping those pumps.