3-22 ENGINE
• Remove the oil seal

8 and spring seat

9.
#
• Remove the other valves in the same manner as described
previously.
CYLINDER HEAD DISTORTION
• Decarbonize the combustion chambers.
• Check the gasket surface of the cylinder head for distortion
with a straightedge and thickness gauge, taking a clearance
reading at several places indicated.
• If the largest reading at any position of the straightedge
exceeds the limit, replace the cylinder head.
% Cylinder head distortion:
Service Limit: 0.05 mm
$ 09900-20803: Thickness gauge
VALVE FACE WEAR
• Visually inspect each valve face for wear. Replace any valve
with an abnormally worn face. The thickness of the valve face
decreases as the face wears. Measure the valve face

T. If it
is out of specification replace the valve with a new one.
% Valve head thickness

T:
Service Limit: 0.5 mm
$ 09900-20102: Venier calipers
VALVE STEM RUNOUT
• Support the valve using V-blocks and check its runout using
the dial gauge as shown.
• If the runout exceeds the service limit, replace the valve.
% Valve stem runout:
Service Limit: 0.05 mm
$ 09900-20607: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block (100 mm)
Do not reuse the removed oil seal.
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