TIMING PROCEDURE ON A 2420

Hi Roger, welcome.

Which fuel pump did you replace, the fuel injection pump or the fuel lift pump?

Why did you replace it? What engine does your tractor have in it?

I don't have enough education to type out the procedure.

But you could Google >> Spill Timing.

Spill timing is how you do it.

Ronald

Your terminology is still a bit confusing as the term “fuel pump” on a diesel usually refers to the lift pump which supplies fuel to the low-pressure side of the injector pump, which then raises the pressure to injector levels and distributes the fuel to the injector lines.  On the Jinma tractors the lift pump and injector pump are combined into the injector pump assembly, though the lift pump section can be replaced separately.  When you say “injector fuel pump” you've sort of hybridized the terminology so I can only guess.

Since you think the timing is off, I would guess that the injector pump assembly was removed from the engine without noting the gear timing on it and either replaced or re-installed out of time.  At this point you have no real choice but to time it by “spill timing” as Ronald has noted.  That basically consists of determining at what point the fuel to the #1 injector “spills over” the end of the line where it connects to the injector itself.  It takes two people and you need to first establish where the top dead center point is on the #1 cylinder, so you can then determine where the relative timing of the spillover occurs and set it accordingly.  You can look up the whole procedure by doing a search as Ronald suggested because I'm already way over my pay grade with this rather inept explanation.

You are doing just fine Rich

Here is a search on Spill Timing, take your pick they are all about the same.

I think it's unfortunate that you replaced the fuel injection pump / governor assembly when it probably wasn't necessary.

The rubber fuel lines can appear to be in perfect condition on the outside but removal can reveal delamination and plugging. Also, there is a filter screen inside the fuel tank that can only be accessed by removing the sediment bowl assembly from the tank. There is also a screen in the top of the sediment bowl assembly, and another in the suction side banjo-bolt fuel line fitting on the lift pump. I assume you have good fuel flow TO the fuel injection pump?

One thought just occurred to me; did you attempt to loosen and turn the little pump assemblies on top of the injection pump assembly?

Let us know how you make out with it, Roger.  Best of luck!