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You really need the special crowfoot wrench for that job. Turning torque is fairly high, and the special wrench has a recess so that it fits the rather thin flatsa and won't slip off the adjuster. You can use a standard crowfoot, but please take a minute or two and grind the bottom flat so that there is no radius in the opening. This will reduce the tendency to round off the flats.... Turn only the upper thin flats, the lower portion is screwed down pretty tight into the head.
You can push the rocker arm off after removing the retainer spring and use a standard socket to turn the screw -- this will, obviously, take considerable time, but is better by far than tight valves.
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!
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