Mercedes-Benz 603 Service Manual page 266

Checking and replacing valve guides
Cylinder head removed (01-415).
Valve springs removed (05-250).
Valves removed.
204
206
Checking
Seat for valve stem seal (205)
Valve guide (204)
Valve guide (204) inside 0
Replacement
Valve guide (204)
05.10 2851' 1
check. Replace valve guide (204) if valve stem
seal is loose.
clean. Cylindrical brush 000 589
check. Plug gauge: 102 589 00 23 00 intake,
117 589 03 23 00 exhaust.
Replace valve guide, if reject pin of plug gauge
fits completely in the valve guide.
drive out, drive home.
Drift:
15 00
intake,
103 589 03
103 589 02 15 00 exhaust.
Punch:
601 589 06 15 00 intake,
601 589 02 15 00 exhaust.
Ream,
Reamers:
21 53 00
intake
000 589
000 589 10 53 00 exhaust
EXIT
10
68 00.