Injector pump rebuild?

farmeroz

Member
What makes a rebuilt pump so expensive? How hard is it to do-it-yourself? Just curious on the answers. I do have a problem on my 3300 diesel when I try to pull the throttle back. When I do, I must pull back very slowly or else it will shut off. I assume this is a problem in the pump. For now I can live with it so just asking.
 
Metering valve is sticking. Try some lube conditioner and with engine at high idle turn fuel off and on quickly. This will move the valve to help free it up. If there is any water in fuel that can make it stick too. Pump may not have to come off if you can free it up.
 
Expense is high because #1 it's an esoteric "specialty", #2 because modern pump test equipment is very expensive, and #3 much of the repair info and tools are not easily available to the general public - so they know they've got you by the n*ts.

Many pumps called "rebuilt" are not. Many are cleaned up, resealed, recalibrated and many high-hour metal parts used over again, as-is. NO renewal process for some. It would not be unusual to pay $700 for a Stanadyne rotary pump on a Deere that received $50 worth of new parts and 2-4 hours labor.
 
More likely the weight retainer ring has deteriorated and the pieces are binding the metering valve.
 
I have all the tools for pump rebuild not in that line of work no more would sell, also have some gaskets and parts 1 618 791 0098
 
If you have the DBG or JDB pump on your engine - there is only one special tool needed to work on it yourself.
A "Bristol Wrench" to get the head screw out. You can find new for around $10. A $10 plastic timing window is nice to have to check the automatic advance on the running engine but not 100% necessary (cost $10). A 2" outside mike can be used to check or set max fuel delivery.

I doubt your metering valve is the problem unless it's worn out. I'd be more apt to think the linkage that operates the metering valve is loose or full of debris from a shattered pellathane weight dampener.

You can get the Deere-Stanadyne manual for free on-line in PDF. New parts costs comes to $15 for a complete seal and o-ring kit. $10 for a new metering valve, $6 for a housing-pressure-regulator, $8 for a new pilot tube, $15 for a new vane-pump kit, and an extra $55 if you want to upgrade the pump and eliminate the plastic-pellathane ring forever.
 
JD, it sure is good to have you back on the board. I remember how you helped me diagnose the pump trouble on my old 5020. Good to have another Michigander on here too, even if its only a part timer. I was really interested in the pics you posted way back when of your home place.
 

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