Can anybody please tell me the size of socket I need for the Crank Pulley securing bolt on my 603?
I am changing the Vacuum Pump this weekend and may need to turn the 'beast' over by hand (with the help of a loooong Breaker Bar no doubt )
Thanks

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I don't know about the 603, but the 61x needs a 27mm deep socket (1/2" drive is best.)

Good luck!

606 takes a 27mm

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I also believe it's 27mm, the only MB exception I can think of is the newer engines, like the modular V6/V8 where they use a large "allen" socket.
Gilly

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Thanks everybody. It is 27mm.
Turns out I didn't need my new socket for the Vac Pump replacement, the engine had the good sense to stop with the lobe away from the piston arm