I didn't bleed my system because the bleeder screw seemed fused to the valve body. (bad idea to have an iron bleeder screw in an aluminum bodied valve in my opinion). But I've driven it at least 3000 miles since I did the accumulators and since the system is self-bleeding, I think the air should be gone.
The noise is not loud and I live on a cul-de-sac.
I have assumed the sound is normal because I've heard similar sounds while operating control valves on hydraulic backhoes.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13