Rato R80, Maintenance Manual, Page: 56 / 79

Part IV Disassembly and Maintenance
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a) Check if the inner surface of valve guide is smooth without scratches and scuffing; and if
the fitting between valve guide and cylinder cover is solid.
b) Before measuring the inner diameter of the valve guide pipe, remove carbon deposit inside
valve guide pipe by valve guide reamer.
If the inner diameter of the valve guide pipe is below the standard or exceeds the maintenance
limit, the guide pipe should be replaced.
Standard Maintenance limit
See Tab. 1-3 See Tab. 1-3
Replacement:
a) Put the valve guide to be replaced in the freezer of the refrigerator to freeze it for about 1
hour.
b) Use the valve guide puller to remove the valve guide from the combustion chamber side.
Valve guide
reamer