Rato R80, Maintenance Manual, Page: 70 / 79

Part IV Disassembly and Maintenance
66
④
Inspection of camshaft
The camshaft is main driving part of valve train of gasoline engine, which controls intake and
exhaust valves to open or close.
Its structural feature is: On the shaft, there are the cam and supporting journal meeting the
requirements for controlling air intake and exhaust. When the cam is working, it bears the
periodic impact load, and the cam working surface and the lifter have intense friction, which
is easy to wear or scratch. Therefore, the cam is required to have wear resistance and good
lubricity.

Visually inspect cam surface and cam height for damage, and the camshaft and bearing
for being loose or worn, and if so, replace the whole group.

Inspect the height dimension of the cam. When the dimension of cam height is less than
the service limit, replace the camshaft.
Plastic feeler gauge scale
Plastic feeler gauge