LONCIN YF300 - Page 53

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3、Sensor failure
4、Ignition switch failure
5、Ignition coil failure
6、Spark plug cap failure
7、Spark plug damaged
8、Short circuit is found in power resource
circuit
Abnormal noise of engine
Diagnosis
Cause
1、Abnormal noise of valve 1、Wide valve clearance
2、Abrasion of valve
2、Piston and cylinder knocking 1、Abrasion on piston and cylinder body
2、Abrasion on piston pin and smaller end
of crankshaft connecting rod
3、Abrasion on bigger end of crankshaft
connecting rod
3、Abnormal noise of bearing 1、Bearing on crankshaft connecting rod damaged
2、Bearing of camshaft damaged
4、Abnormal noise of chain of cam 1、Lengthened chain
2、Teeth abrasion of timing sprocket
wheel
3、Abrasion on guiding plate or tension
plate
4、Incorrect adjustment for chain
tensioner
5、Abnormal noise of transmission and driven gear 1、Insufficient machining precision of gears