Mercedes-Benz 603 Service Manual page 147

Engines 602.91, 603.91 starting 1 l/85
The connecting rods are heat treated before
machining to reduce the tendency to warp.
Production beakpoint: 1 l/85
registered
Engine 603.960 starting 01188
On these engines there are 3 bores (arrows)
with a dia. of 4.5 mm in the connecting rod
eye for lubrication of the piston pin.
03.10 - 313/4
EXIT