Chery QQ Service Manual 465 Engine Mechanical System
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Chery Automobile Co., Ltd
4 Check the following conditions if the cylinder pressure test shows that
there is any damage of valve or valve guide:
l
Valve stem seal wear, chip or installation is not properly.
l
Valve guide wear
l
Valve stem wear
l
Valve or valve seat wear or burnt.
5 Check the following conditions if the test indicating piston ring wear or
being damaged:
l
Piston ring fracture or installation is not correct.
l
End clearance of piston ring is too big.
l
Bore wear or taper is too big.
l
Cylinder is damaged.
l
Piston is damaged.
There is some
abnormal noise
inside the engine.
1 Make sure if the noise accords with the rotational speed of crankshaft or
camshaft while the engine is working.
2 The timing lamp sounds twice every flash ,that is the rotational speed of
crankshaft; the timing lamp sounds just once every flash ,that is the
rotational speed of camshaft.
3 Check the following circumstance if the noise is the same as the
frequency of camshaft rotational speed:
l
Valve train missing or loose.
l
Valve rocker wear or looseness
l
Malfunction of valve spring
l
Valve being bent or being burnt
l
Cam of camshaft wear
l
Check to see if timing belt or pulley wear or being damaged.
4 Check the following conditions if the frequency of knock is the same as
the crankshaft rotational speed:
l
The main bearing of crankshaft or connecting rod bearing wear
l
Piston or cylinder wear
l
Piston or piston pin wear
l
Malfunction of connecting rod.
l
There is too much Carbon deposit on piston crown
There is no
abnormal noise
inside the engine.
1 Check to see if the timing belt or pulley is wear or installed not properly.
2 Remove valve rocker cover of engine side whose cylinder is misfiring.
3 Check the following conditions:
l
The bolt of valve rocker is too loose
l
Push rod is bent
l
Malfunction of valve spring
l
Valve wear or installation is not good.
l
Cam of camshaft wear
