Mercedes-Benz 603 Service Manual page 253

Since 08/88 the valve spring retainers are in bath
nitrided material (previously case hardened).
Standardization with engines 102 and 103.
Production breakpoint: 08188
124.133 6 0 3 . 9 6 0 -
124.193
I I
201.126
6 0 2 . 9 6 1 -
201.128
not recorded
Note
Color markings of valve springs yellow green or
05 10 - 253 3
067330
transmission
018302
013824
003806
EXIT