ENGINE 3-21
CYLINDER HEAD DISTORTION
Decarbonize the combustion chamber.
Check the gasket surface of the cylinder head for distortion
using a straightedge and thickness gauge. Take clearance read-
ings at several places. If any clearance reading exceeds the ser-
vice limit, replace the cylinder head with a new one.
& 09900-20803: Thickness gauge
% Cylinder head distortion
Service Limit: 0.05 mm (0.002 in)
VALVE STEM RUNOUT
Support the valve using V-blocks and measure the valve stem
runout using the dial gauge, as shown. If the runout exceeds the
service limit, replace the valve with a new one.
& 09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block set (100 mm)
% Valve stem runout
Service Limit: 0.05 mm (0.002 in)
VALVE HEAD RADIAL RUNOUT
Support the valve using a V-block and measure the valve head
radial runout using the dial gauge, as shown. If the runout
exceeds the service limit, replace the valve with a new one.
& 09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block set (100 mm)
% Valve head radial runout
Service Limit: 0.03 mm (0.001 in)
VALVE FACE WEAR
Visually inspect each valve face for wear or damage. If any
abnormal wear is found, replace the respective valve with a new
one. Measure the valve head thickness
T. If the valve head
thickness is not within the specified value, replace the valve with
a new one.
& 09900-20101: Vernier calipers
% Valve head thickness
T
Service Limit: 0.5 mm (0.02 in)
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