Checking The Valves And Valve Guides - Orion AGB-21G Service Manual

CAMSHAFT /VALVES AND VALVE SPRINGS
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CHECKING THE VALVES AND VALVE GUIDES

The following procedure applies to all of the
valves and valve guides.
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
guide.
Valve-stem-to-valve-guide clear-
ance
Intake
0.015
Limit: 0.08 mm
Exhaust
0.030
Limit: 0.10 mm
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 in an oven.
a. Remove the valve guide with a valve guide
remover 1 .
b. Install the new valve guide with a valve guide
installer 2 and valve guide remover 1 .
c. After installing the valve guide, bore the
valve guide with a valve guide reamer 3 to
obtain the proper valve-stem-to-valve-guide
clearance.
NOTE:
After replacing the valve guide, reface the valve
seat.
Replace the valve
0.042 mm
0.057 mm