Oil in the vac pump? What for? I assume this is in the procedure?

I'd not put liquid in a gas type pump, it will knock like crazy until it all blows out (if you don't fracture the pump first).

Loud clank can be a loose chain from a failed or depressurized chain. I'd pull the valve cover and check the tensioner -- it must be diffucult to push the rail back against the tensioner with engine recently run. Oil will drain out on sitting, so the chain will slap some on startup if it has significant wear.

You can check the chain stretch by lining up the marks on the cam tower and thust washer (not sure of location on the 606), the reading the degrees past TDC on the crank pulley. Must be less than 8 or replace chain.

Did you replace the o-rings on the pressure valve holders on the IP? If so, did you use a new pressure valve holder copper seal? If not, you may have a leaking seal -- this will cause serious injector knock (sounds like a hammer on the block) on the affected cylinder, along with excess vibration and power loss.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!