The sound you are inquiring about is indeed the engine turning over.
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gp9rm4108
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by dieselsmoke
gp9rm4108 wrote:The sound you are inquiring about is indeed the engine turning over.
That's a pretty broad statement, but I thought we have already established that it's from the compressor
Username
dieselsmoke
by SOU2645
It should be noted that the only 645 powered units I have heard make this sound are MP15DC's and the like. Any AC/DC units with seperate starter motors (GP38-2's etc) do not make that sound when they start up.
Larry