I thought for sure I could find this in a search but no luck yet. I'm going to replace my vacuum pump, do I just pull it out and put the new one in or does it need to be timed to the engine somehow? This is on a 603, currently has the original pump.

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?