Yanmar 3T series diesel fuel injection pump leak; help request

[Bighorn2500]

My John Deere 950 Yanmar 3T series diesel fuel injection pump has started leaking/weeping. Probably the original from 1978, has just over 2200 hours on it. Runs fine just weeping a bit now.

I have ordered the replacement O-rings (#18) to do the job but while looking & researching I'm stuck trying to figure out if the copper washer (#19) is a crush washer and that would require replacement as well when the O-rings are replaced to eliminate the leak.

If anyone is familiar with this repair, please advise if just the O-ring needs replaced or the copper washer is required as well, or even beyond those parts what may be required. Thanks in advance for assistance.

 

[cptbarkey]

Are you sure the lines just dont need to be snugged down?

28 looks like where the copper washer would be. There is probably a gasket under the pump too and could be what is leaking. I've only worked on Kubota pumps, but would imagine yanmar is similar. What does a refurb pump cost? Might be worth considering.

 

[Bighorn2500]

Are you sure the lines just dont need to be snugged down?

28 looks like where the copper washer would be. There is probably a gasket under the pump too and could be what is leaking. I've only worked on Kubota pumps, but would imagine yanmar is similar. What does a refurb pump cost? Might be worth considering.

Tried snugging them up already, torque spec. is 29-32.6 ft lbs. still weeping though. Leak is definitely at what they call the delivery holder I believe which the o-ring seats on.

Figure it’s time to replace the o-rings due to age, just want to ensure I obtain the correct parts required to fix the issue.

Refurb pump runs $600-$800+ depending on vendor, more than I want to invest at the moment.

 

[ElectroMechanoMan]

I don’t think you’ll hurt anything removing the delivery valves and replacing the seals. My son and I upgraded the valves in a Bosch P7000 pump without any problems. Just keep the parts absolutely clean. It might be a different pump, but those particular parts are just about identical in function.

 

[Jimmy_Russells]

Keep in mind the plungers are indexed, you need to count the turns on the DV holders as you remove them, and reinstall them exactly the same.