Factory Service Manual CD Set $19.99+$7 shipping
http://www.classictechlit.mbusa.com/MB/product.asp?catalog%5Fname=Retail&category%5Fname=1009%28ClassicTechLit%29&product%5Fid=QL%2D6516%2D5610%2D02%28ClassicTechLit%29

You might want to be sure that the bearings that drive the timer shaft are replaced also.

New Vacuum Pump Ruined due to too much Timer Shaft End Play (the title from my notes).
second vacuum pump, help! on a trip-Toronto

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84 300D, 82 Volvo 244Gl Diesel