1980 240D. Over the last week, at startup, I get a short-duration (a second or less) growling sound coming from the engine bay immediately after the engine starts/catches. It doesn't happen at every startup, and there doesn't seem to be a pattern associated with it (that I can discern). I suspect it is the starter continuing to engage the flywheel even after it has started the engine, and what I am hearing is the gears grinding. I have had starter problems in other vehicles before (gassers only), but those cars invariably did not start, rather than continued to start.
First off, am I on the right track here? Next, Is there a solenoid associated with this starter, and if so, is this more or less likely to be the culprit? In the gassers I have worked with, the solenoid is a $10 part that is rebuilt in a third world country that might be bad right out of the box.....thanks in advance.

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"Frau Blue Car" 1980 240D think Frau Bluker, cue the horses, formerly known as "China" from JimmyL
"Gunther" 1982 300D.....Turbo!! A/C!! Sunroof!!
"Fraulein" 1975 240D----Donated to NPR