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Group 21 Engine Body
84
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2. Before inserting a new valve seat, measure the
inside diameter of the cylinder head bore and the
outside diameter of the valve seat to make sure
that clearance (fit) is within clearance standards.
Valve seat dimensions, mm [in.]
Cylinder head bore diameter (A)
Nominal value ........... 60.000-60.030 [2.36220-2.36338]
Valve seat diameter (A)
Nominal value ........... 60.100-60.130 [2.36614-2.36732]
Cylinder head bore / Valve seat clearance
standard clearance* .. -0.070 – -0.130 [-0.00276 – -0.00512]
B
Nominal value ........... 3.6 [0.142]
C
Nominal value ........... 8.0 [0.315]
D
Nominal value ........... 11.6–11.7 [0.4567–0.4606]
*A minus (–) indicates interference.
3. Chill the valve seat in liquid nitrogen -70°C
[-274°F] for more than 4 minutes with the cylinder
head kept at normal temperature, or heat the cyl-
inder head to 80 to 100 °C [176 to 212 °F] with
the valve seat chilled in ether or alcohol contain-
ing dry ice.
4. Use the Installer to install the valve seat.
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