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486 PL ENGINE
P
VALVE SEAT : Fig. 186
Valve seat dimensions
INLET EXHAUST
mm mm
Valve seat angle
45
0
-15'
45
0
-15'
Valve seat dia 'F' in
31.46±0.05 27.31±0.05
cylinder head
Distance 'G' between 12.6 ± 0.1 12.5 ± 0.1
cylinder head mating
surface with crank
cylinder head
Gauge dimension
30.7
26.2
of valve seat
Maximum run
0.2
0.2
out of valve seat
in cylinder head
with respect to
valve guide axis
INLET
EXHAUST
G
F
G
F
F
F
Fig.186
VALVE SEAT INSERT