The oil pump chain had been nagging at the back of my mind because I just replaced it and the tensioner.

However, I can make the noise go away by backing my timing chain tensioner out a couple threads so I'm fairly certain it is related to the timing chain or something it touches.

I can't think of any way that the timing chain would effect the oil pump chain.

And my oil pressure is steady, no bouncing that I've noticed.

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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?