Rato R80, Maintenance Manual, Page: 58 / 79

Part IV Disassembly and Maintenance
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d) After installation, check whether the valve guide is damaged, and replace it if it is damaged.
Reamer:
When reaming preciously valve guide with a reamer, be sure to be at room temperature to get
good result.
a) Apply a layer of cutting grease to the valve reamer and valve guide. Screw into the reamer
clockwise until the reamer is fully screwed into the air valve guide pipe. Continue to rotate
clockwise to pull out the valve reamer from the valve guide.
Tool: valve guide reamer
b) Thoroughly remove dirt and debris from cylinder cover.
c) Inspect the hole of valve guide pipe, which shall be in the center of valve guide pipe and
shall be straight and unobstructed, and insert the valve to inspect whether the action is smooth.
If not, the valve guide may have been bent during assembly. If it is bent or damaged, replace
the valve.
d) Check the clearance between valve stem and the guide.
Valve guide
reamer