Don't know about a 617, but on the 603, the ALDA rod just pushes down on a rod in the IP, the position isn't critical and the ALDA is simply held in place with a captive nut. Loosen nut, remove ALDA, put new on and, tighten nut. Line it up so the pressure line fits, there is no other connection I know of.

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!