Recently my IP Pump was rebuilt by Pacific Fuel Injection
Pacific also altered the IP Pump using a Bosch Factory modification issued in the early 70s that allowed for the total elimination of the vacuum dashpot unit. A cam adjustment, ... Pacific sent me the Bosch update article, which I have scanned in my PC as a pdf file.
If anyone is interested, let me know and I will email it to you.
From what I understand... this adjustment can only be made by a professional with Bosch IP Pump test equipment.
For those of you with the later 113’s that have this vacuum dashpot, you probably know what a real pain it is to get it adjusted right… I am happy that they were able to eliminate this piece from the fuel/air mixture adjustment ritual…
Bob
bpossel (Memphis, TN.)
'71 280SL / '97 E320