Injector pump installation?

[DieselBuzz]

Is there anyone who can give me any pointers for installing an old pump with a new gear into a new engine?

Thanks

Art

 

[R.E. Miller]

I might be able to help.

Do you have the tools that are needed to do this?

You need a dial indicator that Snap-on sells to time the injection pump for certian. I have yet to buy one but am close. Also, I have never done this, but I have the service manual, and like the saying goes a man with instructions is a dangerous thing I have the manual, if you would like, I can copy out that section and send it to you? Let me know.



Russell

 

[Scot]

I had my pump rebuilt and it was not timed when I got it back. I was in getting parts at Cummins and they timed the pump for me free (your mileage may vary). At this point you can roll the engine to TDC and set the timing plunger and set the pump in, tighten it down, release the pin and unlock the pump.



At this point it theoretically is timed properly. There is a thread here somewhere that talks about finding true TDC as the plunger may or may not be true. I think you go down the injector hole and measure to find it with a dial indicator.

 

[DJP]

Scot,



I had my injector pump rebuilt twice already, and both times when I installed it, I just used the TDC plunger (just below the injector pump mount pad) to time the injector pump.

The keyway on the injector pump drive should be locked in the 6 O'clock position when you get your pump back from the overhaul shop. I just simply used the TDC plunger to locate TDC, and aligned the notch on the injector pump with the mark on the mount pad. Although true Top Dead Center should be properly established, and the pump timing should be set properly with the dial indicator and correct plunger, you should be able to get your truck to run OK just by doing what I did. For optimum performance, you can either invest a few hundred bucks in tooling, or take it in to a shop to have the timing set properly. Both times I installed my pump this way, and the truck ran fine afterwards. It's your money.

 

[Evan A. Beck]

Since you are installing a new gear, you will need to line up the marks on the cam gear, crank gear, and injection pump gear. If you don't do this, you are going to have BIG problems. There are marks on the gears, so it should be pretty straightforward when you have the front cover off.

 

[Power Wagon]

Originally posted by DJP

Scot,



I had my injector pump rebuilt twice already, and both times when I installed it, I just used the TDC plunger (just below the injector pump mount pad) to time the injector pump.

The keyway on the injector pump drive should be locked in the 6 O'clock position when you get your pump back from the overhaul shop. I just simply used the TDC plunger to locate TDC, and aligned the notch on the injector pump with the mark on the mount pad. Although true Top Dead Center should be properly established, and the pump timing should be set properly with the dial indicator and correct plunger, you should be able to get your truck to run OK just by doing what I did. For optimum performance, you can either invest a few hundred bucks in tooling, or take it in to a shop to have the timing set properly. Both times I installed my pump this way, and the truck ran fine afterwards. It's your money.

The TDC plunger is not a reliable TDC locator. I have personally seen several trucks with errors on that plunger that ranged from 2 to 5 degrees.



The best way to find the true TDC is to remove an injector ,and find the true TDC via a postive stop OR to use an exhaust valve in #1 cylinder to observe the movement of the piston. This will show you when it's at TRUE TDC, and then you can move the plunger to an accurate point.



Some rigs are right on, others are way off. On first generation rigs, you may never know, except for a lack of power or economy relative to other engines, because the pump itself has an advance.