420SEL (126.035) V8-4.2L (116.965) (1986)
Piston: Service and Repair
a Valve recesses
b Trough diameter
NOTE: As standard, the pistons are subdivided into six tolerance groups (group numbers). The following information is stamped into the piston crown:
1. Piston diameter e.g.. 96.505
2. Piston code number e.g.. 72
3. Group number e.g.. 1+
4. Direction of driving arrow