Mitsubishi Fuso CANTER FE85DE6SLGP, Shop Manual

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Replacement of valve seat
[Removal]
•
The valve seats are installed by expansion fitting. To remove a
valve seat, grind inside the metal stock to reduce the wall thick-
ness, then remove the valve seat at room temperature.
[Inspection]
•
Check that the diameter of the valve seat hole in the cylinder
head conform with the standard value.
• Replace the cylinder head if the measurement deviates from the
standard value.
[Installation]
•
Chill the valve seat thoroughly by immersing in it in liquid nitro-
gen.
• Install the valve seat in the cylinder head using and ,
with the chamfered edge of toward the valve seat.
• Turn over so that its chamfered edge is toward , and
calk the valve seat.
• Lap the valve seat and valve.
Inspection: Cylinder head bottom surface distortion
• If the distortion exceeds the specified limit, rectify it using a sur-
face grinder.
CAUTION
• When griding the cylinder head bottom surface, make sure
that the height of the cylinder head (from the top surface to
the bottom surface) is not reduced to a valve below the
specified limit.
CYLINDER HEAD AND VALVE MECHANISM