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VALVES AND VALVE SPRINGS
4. Remove:
• Upper spring seat 1
• Valve spring 2
• Valve 3
• Valve stem seal 4
• Lower spring seat 5
NOTE:
Identify the position of each part very carefully so
that it can be reinstalled in its original place.
INSPECTION
1. Measure:
• Valve-stem-to-valve-guide clearance
Valve-stem-to-valve-guide clearance =
Valve guide inside diameter a –
Valve stem diameter b
Out of specification → Replace the valve
guide.
2. Replace:
• Valve guide
NOTE:
To ease valve guide removal and installation, and
to maintain the correct fit, heat the cylinder head to
100 °C (212 °F) in an oven.
Replacement steps:
• Remove the valve guide with the valve guide
remover 1.
• Install the new valve guide with the valve guide
installer 2 and valve guide remover 1.
5-30
ENG
Valve-stem-to-valve-guide clearance:
Intake:
0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
<Limit>: 0.08 mm (0.0031 in)
Exhaust:
0.020 ~ 0.047 mm
(0.0008 ~ 0.0019 in)
<Limit>: 0.10 mm (0.004 in)
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