HYOSUNG TE 450 Service Manual page 65

3-23 ENGINE
● Install the valve spring retainer by pressing down
the spring using the valve spring compressor. Fit
the cotter halves to the stem end and release the
lifter to allow the cotter ①
retainer and the valve stem. Make sure that the
rounded lip ②
of the cotter fits snugly into the
groove ③ in the stem end.
Valve spring compressor
Valve spring compressor attachment
CAUTION
Be sure to install all of the parts in their original
positions.
▣ ▣ CYLINDER HEAD DISTORTION
Decarbonize in combustion chamber.
Check the gasket surface of the cylinder head for dis-
tortion using a straightedge and thickness gauge.
Take clearance reading at several places as indicat-
ed.
If any clearance reading exceeds the service limit,
replace the cylinder head with a new one.
Cylinder head Cylinder head
distortion distortion
Thickness gauge : 09900-20806
▣ ▣ 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. The thickness of the valve face
decreases as the face wears. Measure the valve
head thickness �. If the valve head thickness is not
within the specified value, replace the valve with a
new one.
Cylinder head Valve head
thickness � �
distortion
Vernier calipers : 09900-20101
to wedge between the
: 09916-14510
: 09916-14520
Service limit
0.05 mm (0.002 in)
Service limit
0.5 mm (0.02 in)
③
�
②
①