Appendix
38
inspection while filing, until the clearance is proper.
Standard
Service limit
Ring 1/ring 2
0.20-0.40mm
1.0mm
Oil ring
0.15-0.35mm
1.0mm
③
Inspection of connecting rod
When the connecting rod is bent, twisted, or the outer ring
of the big end bearing pad and the small end bushing
moves, or there is a crack on one side, it shall be scrapped
and replaced with new one.
a) Inspection of inner diameter of small end
If it is below the criterion or exceeds the maintenance
limit, the connecting rod should be replaced.
Standard
Service limit
17.016mm
17.052mm
b) Inspection of inner diameter of big end
If it is below the criterion or exceeds the maintenance
limit, the connecting rod should be replaced.
Standard
Service limit
40.022mm
40.066mm
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 tappet 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.
Standard
Maintenance limit
Cam height Intake
4.723mm
4.35mm