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

−
−