Pistons With Angular Channel; Piston Crown - Mercedes-Benz 603 Service Manual

Pistons with angular channel

Due to the higher thermal load the pistons are
cooled with oil via an annular channel in the
piston crown. Moreover the piston pins are
supplied with oil injected through the two bores
(2.0 mm dia., arrows), ending in the annular
channel.
The required oil is supplied via injection nozzles
located in the crankcase on the right side.
The annular channel is deleted on engine
603.970. Only the piston crown is supplied
with oil.
A located on the piston skirt (arrow) for
recess is
the oil injection nozzle.
The prechamber recess in the piston crown has
a diameter of 18 mm (normally aspirated engine
=

Piston crown

On 602.96 603.97
engines and
production and on engine
' moose horn' recess pistons are installed
(previously ' star' recessed pistons).
The piston
crown is coated with aluminum oxide
on both piston versions.
03.10 - 317/5
from the start of
603.96
starting
horn' pston
A. ' Moose
EXIT
P O 3 2 2 1 0 - 1 3