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VALVE SEAT INSPECTION/REFACING
INSPECTION
The valve cannot
be
ground.
If the valve
face is burned or
badly worn or
If it
contacts
the
seat
unevenly, rep/ace
the valve
Clean all intake and exhaust valves thoroughly to
remove
ca
rbon
deposits.
Apply a
light
coating
of
Prussian Blue
to
each valve
seat.
Tap the
valve
against the
valve
seat several times
without rotating the valve, to check for proper valve
seat
contact.
Remove the valve and inspect the valve seat face.
The
valve
seat
contact
should be within the speci-
f
ied
width and even all around the
circumference.
STANDARD:
1.0
-
1.1 mm
(0.039
-
0.043
in)
SERVICE
LIMIT:
1.4 mm
(0.06
in
)
If the valve seat width is not
within
specification,
retace
the
valve
seat.
Inspect
the
valve
seat face for:
•
Uneven seat
w
idth
:
-
Replace the
valve
and reface the
valve
seat.
•
Damaged face:
-
Replace
the
valve and reface the valve seat.
•
Contact
area (too high
or
too low)
-
Reface the valve seat.
CYLINDER HEADIVALVE/CAMSHAFT
•
t
DAMAGED FACE
TOO LOW
SEAT WIDTH
UNEVEN SEAT
W
IDTH
TOO
HIGH
8-13
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