About 2:50 looks like powder coating. Then they start the balancing procedure. The items clamped onto the crankshaft are called "bobweights" which simulate the weight of the pistons and connecting rods so weight can be added to or removed from the crank counterweights, like balancing a wheel/tire assembly.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!