Just had to replace both motor mounts on my 1970 Chevy. When I accelerated just right, the fan would contact the shroud due to engine torque raising the engine. It made a ringing metallic sound. Don't know why yours won't do it from a stop though. Worth checking I guess.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".