CHERY A21 SERVICE MANUAL MECHANISM OF 2.0NALC ENGINE
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7) Inspect cylinder
a: Inspect if the cylinder wall is scratched
or scored. If there are cylinder scoring
and scratching you need to hone cylinder
wall, replace cylinder liner or replace
cylinder block.
b: Examine the inner diameter and
cylindricity of cylinder with cylinder
gauge.
Standard value
Inner diameter 83.5
cylindricity 0.008
cylindricity= Maximum bore － Minimum
bore/2
As the picture, measure the bores of 3 planes
along both A direction and B direction
respectively. Get the maximum and the
minimum from 6 values, and then subtract the
half of Minimum from the Maximum to get
cylindricity;
3.2.3 Installation
1) Spread oil on the piston pin and in the
piston pin hole, connect the piston and
connecting rod with piston pin, and
mount the piston pin circlip.
2) Mount the piston ring. Mount the rings
on the piston in the sequence of oil ring
expander, upper and lower segments, 2nd
air ring and 1st air ring; Pay attention to
the direction of piston ring, the side with
“TOP” should be upward. The two
segments and expander are staggered.
The angle of expander connector points
to the top of piston, and the 1st ring and
2nd ring form 120° with the upper
expander.
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