I just went through this, and I went whole hog and repowered (something I was planning to do anyway, the cost of the injection pump rebuild
accelerated the process).
That pump leaking where the throttle linkage exits the pump body is indicative of main shaft seal
failure - not a guarantee, but a likelihood.
To confirm, you need to pull the pump from the engine
: remove the heat exchanger
, disconnect the copper hi-pressure lines from the pump, and extract the pump (on my engine
I had to invent a very long, strong tool to reach in behind the pump to get at an allen screw, as I didn't have Perkins
Special Tool PD.130A). Scribe two lines across the connection between the pump body and engine before unbolting the pump (this is handy for re-attaching the pump to the motor
later on). Do NOT move the engine pistons at all if you're pulling the pump (timing problems will result).
With the pump in hand, if diesel fuel
drips out past the shaft as you rotate it with your fingers, then you have a leaking main shaft seal
the pump. I was quoted, on average, $1,000 to do this from the various shops that rebuild those pumps.