1
2
3
4
Refacing valves
110
Fig. 1
Apply abrasive paste to tapered area on the valve
seat.
Oil valve guide and insert valve.
Fig. 2
Use valve refacer to reface valve seat by applying
moderate axial pressure and describing a turning
motion.
Caution:
Keep valve stem and valve guide free of
abrasive paste.
Fig. 3
The valve seat must have a faultless, closed
grinding pattern Á.
The grinding pattern width is correct if the valve
seat insert is in order.
À Valve tapered area
Á Valve seat
Fig. 4
À Valve seat insert
Á Valve
 Valve seat good
à Valve seat too wide
Note:
Valve seats which are too wide tend to
accumulate coking residues,
− valves become leaky −
Valve seats that are too small prevent
rapid discharge of heat from the valve
disc to the cylinder head,
− valves burn −
1 2
1 2 1 2
34
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