Engine 2.0 (Chery Fora, A21). Manual — part 1

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 . . . . . . . . . . . . . . . . . . . . . ... 6

SECTION 3 ENGINE NUMBER POSITION . . . . . . . . . . . . . . . . 7

SECTION 4 COLLATING METHOD OF ENGINE TIMING . . . . . . . . . ... 8

CHAPTER 2 ENGINE BODY

. . . . . . . . . . . . . . . . . . . . . . ... 10

SECTION 1 WHEEL TRAIN . . . . . . . . . . . . . . . . . . . . . . 10

SECTION 2 CYLINDER HEAD . . . . . . . . . . . . . . . . . . . . .. 15

SECTION 3 SHORT ENGINE . . . . . . . . . . . . . . . . . . . . . .. 29

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

Engine Oil

Pressure

（Bar）

Low Idle Speed

（800±50r/min）

High Idle Speed

（2000r/min）

High Speed

（4000r/min）

A/C Circuit

Pressure

（Bar）

High Pressure Circuit

2--3

Low Pressure Circuit

12---16

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

3

Expansion Tank

Cap

（kpa）

Pressure Relief Valve

（Release Pressure to

Outside

）

88±14.5

Vacuum Valve

（Lead Air

into Tank

）

-10~~~~-2

Thermostat

Working

Temperature

（ ）

Start Working

Temperature

87

Full Working

Temperature

104

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

4

TECHNOLOGY DATA INSTRUCTION

Item Standard

Value

Camshaft

Cam Height

Intake cam

37.15

Exhaust cam

37.05

Camshaft Diameter

Intake cam

Exhaust cam

Axial clearance of Camshaft

Intake cam

0.15--0.20

Exhaust cam

0.15--0.20

Cylinder

Head

Plane Degree of Lower Surface

0.04

Whole Height

140±0.41

Surface Grind Limit* Total Grinding Quantity of

Cylinder Block and Head

Valve

Fringe Thickness on Top of Valve

Intake Valve

0.3±0.15

Exhaust Valve

0.3±0.15

Valve Stem Diameter

Intake Valve

5.98±0.008

Exhaust Valve

5.96±0.008

Seal Bandwidth

Intake Valve

Exhaust Valve

Gap Between Valve Stem And Guide

Intake Valve

0.02

Exhaust Valve

0.04

Tilt Angle

Intake Valve

65°

Exhaust Valve

68°

Height

Intake Valve

107.998

Exhaust Valve

106.318

Valve

Spring

Free Height

47.7

Working Tension in Advance/ Working Height Kg /mm

620N/32mm

Vertical Degree

Valve

Guide

Valve Guide Length

38±0.25

Inside Diameter

5.4±0.1

24

040

.

0

053

.

0

−
−

24

040

.

0

053

.

0

−
−