Adam:

The pressure valve holder lock rings prevent the holders from unscrewing due to vibration. They need to go back in the same order they were originally, not the exact same orientation. There is a slot for the bolt so that you can slip them over the holder, lightly pre-tension against rotation, and screw down. The pressure valve holder won't be in exactly the same rotational posistion as they were before.

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!