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Chery A15. Manual - part 14

shall be installed on the left threaded hole of
the fourth main bearing cap (seeing from the
front).

Apply some motor oil on the head joint before
installing the main bearing cap bolts.

Tighten the main bearing cap bolts and stud
by hands, then tighten them to the moment
of 90~100Nm.

The twist moment of the crank shaft
(assembly with piston connecting rod) is
16Nm max.

Oil baffle assembly

Removal

Take the oil baffle assembly out from the
right side of the back of the cylinder block
(seeing from the front)

Installation

Install the oil baffle assembly from the right
side of the back of the cylinder block (see
from the front). The tension spring of the oil
baffle assembly shall be lower than the
crankcase flange of the cylinder block.

B-32

PISTON AND CONNECTING ROD ASSEMBLY

PISTON REMOVAL, MEASURE AND INSTALLATION

Removal

Rotate the crank shaft to the bottom dead
center (BDC) of the removed cylinder, check
whether there is a cylinder number on the
connecting rod body and cap, which shall be
on the left of the rod (seeing from the front).
If there is no such a number, number each
cylinder before removal.

Remove the connecting rod bolts to dismantle
the connecting rod cap, take the
connecting-rod bearing shell out and label the
cylinder number and bottom and top shell on
the back of the shell.

Push the connecting rod and piston out from
the cylinder block with a wooden club and
take the cylinder rod out.

Remove the piston ring with a special tool or
the leaf of a clearance gauge and label each
cylinder and bottom and top leaf.

Press the piston pin out of the piston and the
small end of the connecting rod with a press
machine and put the piston, piston ring and
pin of each cylinder together.

B-33

Rinsing and inspection

Rinse and clean the carbon deposit on the
piston, piston ring and pin.

Rinse and clean the carbon deposit on the
bottom of the cylinder bore.

Measure the diameter of the cylinder bore.

480 M cylinder bore (unit: mm)

480 E cylinder bore (unit: mm)

1 79.94-79.95

79.94-79.95

2 79.95-79.96

79.95-79.96

3 79.96-79.97

79.96-79.97

Ex-factory

grouping

4 79.97-79.98

79.97-79.98

A 80.23-80.24

80.23-80.24

B 80.24-80.25

80.24-80.25

Ex-factory

repair

C 80.25-80.26 C 80.25-80.26

Standard 79.965-77.975 Standard 79.965-77.975

Oversized by 0.29

80.245-80.255

Oversized by 0.29

80.245-80.255

For

Maintenance

Oversized by 0.5

80.466-80.475

Oversized by 0.5

80.466-80.475

Grind the cylinder bore according to the size for
maintenance with the grinding angle to be 50°
~60°.

Measure the piston from the point that is 19mm
away from the bottom of the skirt.

B-34

Diameter of 480M piston skirt

(unit: mm)

Diameter of 480E

piston skirt (unit: mm)

Diameter of UAES’s

new two-valve piston

skirt (unit: mm)

1 79.91-79.92

79.915-79.925

2 79.92-79.93

79.925-79.935

3 79.93-79.94

79.935-79.94

Ex-factory

grouping

4 79.94-79.95

79.945-79.955

A 80.20-80.21

80.205-80.215

B 80.21-80.22

80.215-80.225

Ex-factory

repair

C 80.22-80.23

80.225-80.235

Standard 79.93-79.955

79.965-79.975

Oversized by 0.29

80.21-80.235

80.245-80.255

Spare

parts

Oversized by 0.5

80.43-80.455

80.465-80.475

80.435-80.455

Measure the diameter of piston pin bore

Diameter of 480M piston pin bore (unit: mm)

Diameter of 480E piston pin bore (unit: mm)

White 20.630-20.633

White

20.630-20.633

Red 20.633-20.636

Red

20.633-20.636

Blue 20.636-20.639

Blue

20.636-20.639

Measure the diameter of the piston pin

Diameter of 480M piston pin bore (unit: mm)

Diameter of 480E piston pin bore (unit: mm)

White 20.622-20.625 White 20.622-20.625

Red 20.625-20.628 Red 20.625-20.628

Blue 20.628-20.631 Blue 20.628-20.631

Measure the end clearance of the piston
ring
First compression ring: 0.30-0.50mm

Second compression ring: 0.30-0.50mm

Oil ring: 0.40-1.40mm

B-35

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