Are you using motor oil or ATF in the hydraulic damper? If you are using ATF, it may be too thin.

Just a thought, I've never had the "privilege" of fighting one of these. Another though is a stuck heat riser if you have one (I don't remember if there is on on this application).

I will check with my friend Hans, though, just in case he knows some trick.

When the work, they work very well. Ditto for the 2700 variable venturi Holleys. They didn't work well enough to stand up to electronic fuel injection, though!

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!