I'm using a Volvo Penta manual the dealer emailed me. It's titled "Workshop Manual AQUAMATIC 280, 280-DP, 285, 290, 290-DP" Volvo Penta at the bottom. The following page says Workshop Manual, Drives 280, 280-DP, 285, 290, 290-DP, SP-A, SP-C, DP-A, DP-B, DP-C.
I did find shims between the clamp...