Johann from Das Boot

[DanCanovas]

could anyone tell me what this chap is doing when he puts that instrument to his ear and to the engine?

[Kruger]

Listening to the strikes of the pistons. I reckon that it's a way to tell if something is cracked or not. IUt;s the same ting that railwaymen do, wheb they hammer the train wheels.

[Wilko]

Yeah, listning to the tappets and for any odd knocking :know:

[Seeadler]

The actors website:
http://www.erwin-leder.com/biographie/index_english.html
He also act as "Singe" in the Vampire movie "Underworld" :D