I had a mechanic once attempt to change some leaking seals in my IP -- and messed up the timing so badly it sounded like a Cummins. Never did get it right and had to get a rebuilt injection pump (not cheap).

Good luck.

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'91 300D 2.5 Turbo 330K
'00 VW TDI Golf, 190K
'67 BMW R50/2
'73 Norton Commando Interstate