Ah. We can safely assume your ALDA is not a virgin then. They come from the factory with a plastic cap/seal over the screw, not something that pops off and gets lost, as the Gods of Bosch aren't keen on owner servicing of their lovely pump. On my old SD it was black, others say theirs was silver/grey.

This does not necessarily mean anything. Only one out of the four turbodiesels I have owned had the cap still in place when I got it.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

I've had my 300sd for 4 years. biggest difference in power i found was valve adjustment (Mercedes Diesel Valve Adjustment Procedure) and IP timing (Injection Pump Timing Adjustment for Mercedes 617 Engines - Topic)

... another bump for an old post... why? it's like you are looking for low power threads, and injecting your opinion on the solution... to threads that are years, nearly a decade old on one case...
I"m thrilled you found power from a valve adjustment, and IP timing set, but MOST turbocharged motors lose power when the fuel enrichment device (ALDA) does not receive the boost signal to add fuel...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

............one post out of hundreds that don't belong on a specific thread or have been posted without any investigation or forethought.

Why pick on this one?