Replacing Valve Seat Inserts - Mercedes-Benz 603 Service Manual

Replacing valve seat inserts

Valve guides checked (05-285).
Valve seat insert
Basic bore (D2)
Valve seat insert
Valve seats
turn out valve seat insert with the lathe tool.
Note operating instructions for the valve seat
turning equipment.
check (table). Bore out to the repair stage, if
required.
Caution!
Machine basic bore for the valve seat insert if
minimum overlap is not achieved (Number 3).
supercool with liquid nitrogen and insert
into basic bore.
Do not touch supercooled valve seat inserts
with bare hands.
Valve seat insert must be square to the cylinder
head.
machine (05291).
EXIT