46
camshaft.
Standard
Maintenance limit
19 mm (inlet)/19 mm (exhaust)
18.9116 mm (inlet)/18.9116 mm (exhaust)
Inspect the outer diameter of the cam.
When it is less than the service limit,
replace the camshaft.
Standard
Maintenance limit
14.966-14.984 mm
14.916 mm
Analysis on causes of camshaft wear and its impact on the performance of whole gasoline
engine:
The main cause for abnormal camshaft wear of the camshaft is poor lubrication, Factors
such as low oil viscosity, many impurities and small circulating oil volume is unable to form
complete oil film on the camshaft surface, to cause it to be in a state of high-speed dry friction,
resulting in serious wear on the cam surface. The second is assembly accuracy of the camshaft.
When matching clearance between camshaft journal and camshaft seat or bearing is out of
tolerance, rotation accuracy of the camshaft will decrease, and the contact with related parts
will generate deviation plane t cause abnormal wear.
⑥
Timing gear
a) Inspect meshing clearance of the timing gear, which shall align marks of gears on both sides.
