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Hi Richard,
the crud gets into the normally dry detent and Idle adjust screw housing when that Chinese bloke Sum Wun steals or forgets to put back the Injection Pump Timing Pin/bolt, P/No--4N6430, back in place into the protrusion you see at the rear of the outer cover you have removed.
When the crud and water gets in it causes rust pits in the springs and they fail/break--quite common due to the above reasons. Not all engine applications had the pin/bolt, I seem to recall.
There is an update/repair for the main rear Governor Housing spindle bushing bore--they did not have a bushing originally-- and we had a jig and reamer to fit them at The Dealer, once done they can easily be replaced.
I think the shaft movement, when the alloy housing wears, is too much for the seal lip to cope with--along with rusting at the lip/shaft working area.
You now cannot just simply re-fit the spindle as there are Governor actuating parts inside the Main Gov. Hsg. that will have dropped into said housing and can only be re-instated with the housing on the bench.
The inside of the injection pump and rear gov. housing are full of fuel at around 30 PSI when the unit is operating.
Alas, I only have a Parts Book for a D6C and not a D6D, that shows the Sleeve Metering Pump--I cannot recall if there are any major differences in the two pumps other than maybe either/or both, if at all, the Torque Spring Group and Governor Spring.
I guess if you do not have a Parts Book I can scan what I have if it may help at least give you an idea what is inside--seals and gaskets etc. should be same between the two units.
Cheers,
Eddie B.
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