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· Check inner diameter of the camshaft bore, if bigger than the service limit, replace the camshaft.
If the sprocket teeth damaged, please replace the camshaft with new one.
Camshaft wearing cause analyses and to engine performance influence：
Poor lubrication will result in camshaft abnormal wearing, such as, oil viscosity low, impurity too
much, and recycling oil little can’t let the camshaft surface forming complete oil film to make the camshaft
surface seriously worn in the high speed rubbing stat. Second, installing precision problem, when the
matching clearance of the camshaft journal and camshaft seat or bearing is out of the service limit,
camshaft rotation precision will lower and contacting with the relative part produce deviation face to make
abnormal wearing.
⑤ Crankshaft： Push the bearing with care
until it contacts the crankshaft in order not to
damage the crankshaft output end and timing
gear.
·Check timing gear for engagement clearance
of the chain. The camshaft, timing chain guide,
tensioner, and crankshaft timing gear should
be sufficiently matched with chain and contact
governor driven gear of the governor gear.
·Timing gear will be damaged in gear worn, gear face peeling off, and gear teeth broken. Due to gear
wearing, the engagement clearance will become bigger, and the noise will become bigger.
·If the timing gear face is damaged, please replace with new one.
NOTICE: Please replace the gear with a new set to ensure the engaging face completely engage in.
Standard Service limit
9.00-9.04mm 9.1090mm
Camshaft
Chain guide
Tensioner
Chain
Timing gear
Driven gear