Mercedes-Benz 603 Service Manual page 207

1
Position piston in cylinder 1 to approx.
BTDC, ignition stroke.
Holder for TDC sensor, engines 602 and 603 from
start of productlon
2 Bolt gauge 601 589 07 21 00 up to
precombustion chamber bore and attach dial
gauge to gauge with 5 mm pretension (small
pointer on dial gauge).
If the cylinder head is removed, the measuring
pin on the dial gauge can be positioned directly
on the piston crown. Set dial gauge holder
21 00
363 589 02 on crankcase mating surface.
03 10
EXIT