Mercedes-Benz 603 Service Manual page 163

These pistons each have two compression
and one oil scraper ring. The piston skirt is
graphitized.
00 Engine 602.96 /
Piston codes:
13 Engine 603.96
03.10 317 6
B. ' Star' recessed piston
rings
178
surface chrome-plated
179
Taper face ring wtth inside bevel, 2 mm thick,
Rectangular nng with InsIde bevel, 2.5 mm thick,
180
running surface molybdenum-coated
EXIT