hybrid isuzu/cummins pump finished!

[truckinwagen]

well, I retarded the timing to where the clatter at idle was almost eliminated, and now it hits the stumble and looses power at 3000RPM

gonna time it in the middle for now, so it is more drivable(with a 3-speed I need to rev past 3K alot) and then get the softer spring for the advance to fix the problem outright.

-Owen

[truckinwagen]

that I did not swap over, and it is easy to do(not hidden by the intake manifold)
I'll try that.

I did clearance my spare timing spring cover(to allow more total timing advance) to go with the softer spring, if it comes to that.


but to get to the timing advance cover I have to pull the pump, so I will wait until I get the green spring before I do that.

-Owen

[truckinwagen]

cool, thanks!

[rabbitman]

Which pressure regulator did you use?  They are specific to the plunger size so you'd need to use the cummins one.

My gut feeling says that'll fix it

[truckinwagen]

well, changed the regulator.
it helped, but not much, moved the stumble from 3000 to 3250RPM

gonna go forward with the softer advance spring.

-Owen