Chery Fora (Elara A520). Manual — part 157

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

1

MECHANISM OF 2.0NA ENGINE

CONTENT

CHAPTER 1 ENGINE PARAMETER AND SPECIAL MAINTENANCE TOOLS . 2

SECTION 1 TECHNOLOGY DATA INSTRUCTION . . . . . . . . . . . . 2

SECTION 2 SPECIAL TOOLS. . . . . . . . . . . . . . . . . . . . ... 5

SECTION 3 ENGINE NUMBER POSITION . . . . . . . . . . . . . . . . 6

SECTION 4 COLLATING METHOD OF ENGINE TIMING. . . . . . . . . . 7

CHAPTER 2 ENGINE BODY . . . . . . . . . . . . . . . . . . . . . . 9

SECTION 1 WHEEL TRAIN. . . . . . . . . . . . . . . . . . . . . .. 9

SECTION 2 CYLINDER HEAD . . . . . . . . . . . . . . . . . . . .. 14

SECTION 3 SHORT ENGINE. . . . . . . . . . . . . . . . . . . . .. 26

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

2

CHAPTER 1 ENGINE PARAMETER AND SPECIAL MAINTENANCE TOOLS

SECTION 1 TECHNOLOGY DATA INSTRUCTION

ENGINE CHARACTER

Engine Model

SQR481H

Engine Type

4-Cylinder, Water Cooled, In-line Double

Overhead Camshaft, 16 Valve,

Controllable Burning Rate, Variable Valve

Timing

Cylinder Diameter（mm）

83.5

Piston Stroke (mm)

90

Displacement (L)

1.971

Compression Ratio

10

Rated Power（Kw）

95

Rev at Rated Power（r/min）

5500

Max. Torque（N●M）

180

Rev at Max. Torque（r/mim）

4000

Minimum Fuel Consumption Rate（g/Kw.h）

301

Cylinder Pressure（Bar）

10±0.2

Fuel Pressure（Bar）

4

Low Idle Speed

（800±50r/min）

High Idle Speed

（2000r/min）

Engine Oil

Pressure（Bar）

High Speed

（4000r/min）

High Pressure Circuit

2--3

A/C Circuit

Pressure（Bar）

Low Pressure Circuit

12---16

Pressure Relief Valve

（Release Pressure to

Outside）

88±14.5

Expansion Tank

Cap（kpa）

Vacuum Valve（Lead Air

into Tank）

-10~~~~-2

Start Working

Temperature

87

Thermostat

Working

Temperature（℃）

Full Working

Temperature

104

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

3

TECHNOLOGY DATA INSTRUCTION

Item

Standard Value

Intake cam

37.15

Cam Height

Exhaust cam

37.05

Intake cam

Camshaft Diameter

Exhaust cam

Intake cam

0.15--0.20

Camshaft

Axial clearance of Camshaft

Exhaust cam

0.15--0.20

Plane Degree of Lower Surface

0.04

Whole Height

140±0.41

Cylinder

Head

Surface Grind Limit* Total Grinding Quantity of

Cylinder Block and Head

Intake Valve

0.3±0.15

Fringe Thickness on Top of Valve

Exhaust Valve

0.3±0.15

Intake Valve

5.98±0.008

Valve Stem Diameter

Exhaust Valve

5.96±0.008

Intake Valve

Seal Bandwidth

Exhaust Valve

Intake Valve

0.02

Gap Between Valve Stem And Guide

Exhaust Valve

0.04

Intake Valve

65°

Tilt Angle

Exhaust Valve

68°

Intake Valve

107.998

Valve

Height

Exhaust Valve

106.318

Free Height

47.7

Working Tension in Advance/ Working Height Kg /mm

620N/32mm

Valve

Spring

Vertical Degree

Valve Guide Length

38±0.25

Valve

Guide

Inside Diameter

5.4±0.1

24

040

.

0

053

.

0

−
−

24

040

.

0

053

.

0

−
−

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

4

Outer Diameter

Pressure Height

16±0.3

Protruding Part of Valve Stem

47.5

Piston

Piston Skirt Diameter

83.46±0.009

1

st

Ring

0.04--0.08

Side Clearance

2

nd

Ring

0.01--0.025

1

st

Ring

0.2--0.4

End Play

2

nd

Ring

0.4--0.6

1

st

Ring

2

nd

Ring

Piston

Ring

Height

Oil Ring

1

st

Ring

2

nd

Ring

Ring

Groove

Height/ Depth

Oil Ring

2.5

Diameter

Length

60

Piston Pin

Diameter of Piston Pin Hole

Axial Clearance

0.076--0.265

Radical Clearance

-0.0375

Coaxial Degree

0.05

Cylindricity

0.008

Crankshaft Mainshaft Diameter

Roundness

0.005

Cylindricity

Crankshaft

Connecting Rod Journal Diameter

Roundness

Whole Height

218±0.05

Cylinder Hole Roundness / Straightness Accuracy

0.008 / 0.01

Cylinder

Upper Surface Planeness

0.04

Radial Clearance of Connecting Rod Bearing

0.016--0.051

Connectin

g Rod

Axial Clearance of Big End

0.15--0.4

11

051

.

0

040

.

0

+
+

2

.

1

05

.

0

03

.

0

+
+

5

.

1

04

.

0

02

.

0

+
+

5

.

2

03

.

0

01

.

0

+
+

21

0

005

.

0

−

21

008

.

0

002

.

0

2

.

1

01

.

0

03

.

0

−
−

5

.

1

005

.

0

030

.

0

−
−