CYLINDER HEAD, CYLINDER, PISTON
CYLINDER HEAD, CYLINDER, PISTON
3-5-30
◆
Use a micrometer to measure the diameter of the
valve stem at three places, and then turn it 90° to
measure again (a total of six measurements), and
compare with the standard value.
◆
Measure the diameter of the top and bottom of the
valve guide hole, and measure two directions at
each position.
Valve guide aperture:
5.500 - 5.515 mm(0.2165" ~ 0.2171")
◆
Measure each valve and valve guide combination
separately.
TIPS
The valve guide cannot be replaced.
Combustion chamber cleaning
!
WARNING
Wear protective goggles when cleaning the combustion
chamber.
◆
Clean all carbon deposits in the combustion
chamber and valve seat area.
◆
Visually inspect the surface of the cylinder head
gasket and the combustion chamber for cracks or
damage. Pay close attention to the spark plug and
seat ring area.
TIPS
If necessary, the valve can be re-dressed or ground. If
it is severely worn, burned, bent or damaged, it must be
replaced
Valve stem diameter:
Standard Limit
exhaust
5.455 ~ 5.470 mm
(0.2147" ~ 0.2153")
————
intake
5.475 ~ 5.490 mm
(0.2155" ~ 0.2161")
————
!
CAUTION
Do not use metal scrapers, thick wire brushes or
abrasive cleaners to clean the cylinder head. May cause
damage.
Combustion chamber
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