Rato R2000IS, Руководство по обслуживанию

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APPENDIX
37
④
The detection of the camshaft
Camshaft is gasoline engine driving parts, it controls the inlet and exhaust valve opened
or closed according to certain rule.
Structure characteristics: satisfy the requirement of control inlet and exhaust shaft with
CAM and supporting shaft neck. When the camshaft working, it bear the impact load of
cyclical, camshaft face friction with the lifter, it is easy to wear or scratch. Therefore,
camshaft should have good lubricity and wear-resisting.
Ÿ
Check the camshaft if there is any damage on the surface,
the camshaft and bearing is loose, wear or tear .If it is ,you
should replace all of them.
Check the height of the camshaft, when the height less
than the maintenance period, you should replace the
camshaft.
Standard Maintenance limit
Camshaft height intake 20.54mm 20.24mm
Camshaft height outtake 20.54mm 20.24mm
Ÿ Check the camshaft neck diameter, if it is less than
the standard, you should replace camshaft
Standard Maintenance limit
11.965~11.99
mm Using with the standard
Wear reasons and affect for the engine performance:
Camshaft is wearing and tearing, the main reason is poor lubrication, such as low oil
viscosity, impurities, small amount of circulating oil etc., cannot make the camshaft surface
full oil film which lead to the camshaft with high speed dry friction state of the surface wear
serious. The accuracy installation is the second reason. When the camshaft neck and
camshaft bearing fitting clearance between super bad, camshaft rotating accuracy decreased,
and the related parts of biased contact surface caused by abnormal wear.