Mercedes-Benz 603 Service Manual page 133

Installation note
Insert prechamber into mounting bore so that lug
on collar of prechamber fits in recess in cylinder
head (arrows).
Clean mounting bore for prechamber in
cylinder head, check and cover.
Note
Refinish prechamber sealing surface if required
(01-410).
6
Check prechambers.
Note
The spherical pin must not be burned or scaly.
If the combustion tips are burned or cracked in
the bottom section of the prechamber, check the
following:
1.
Oil level at oil temperature of approx. 80 " C.
If the quantity of oil in the oil pan is too high,
correct oil level.
2. Check piston vacuum pump for damage or
replace vacuum box on injection pump.
To determine with component is unfit for use,
check vacuum lines (blackened with oil).
7 Install in opposite order.
EXIT