Chery QQ6 (S21) / S12LHD. Manual — part 220
Chapter One Introduction of Characteristics
I. Overview
SQR473F engine is one of the ACTECO series engines that are jointly designed and developed by
Chery company and AVL-a world famous engine design company. This engine adopts such
advanced technologies as overhead double camshaft structure, 4 air valves, electronic throttle
body and electronic accelerator pedal etc. In terms of such mandatory standard indexes as
emission and noise, this engine is outdoes national standard and has reached overseas advanced
stage.
II. Number Position of the Engine
Number of the engine locates at right side of oil filter
where bearing shell cover and cylinder block join.
III. Connotation of Engine Number
Each engine has a unique number, from which you can know some characteristics and information
of the engine. Engine model should conform to requirements in GB725 and is consisted of
enterprise code, number of cylinders of the engine, bore, characteristic code and specification
code.
A complete engine model is as follows:
□□□ ○ ○○ □ □
Among which, ○ indicates an Arabic numeral while □ indicates a letter.
The enterprise code is stipulated as SQR;
Number of cylinders of engine is a 1-2 digit integer;
Characteristic code
Cylinder bore
Specification code
Number of cylinders
Enterprise code
The bore refers to diameter of cylinder sleeve, which is specified by a 2-3 digit integer with the
decimal part rounded and millimeter as unit.
Characteristic code: indicates the most basic characteristics of an engine and is specified by 1 digit
upper case English letter.
Specification code: specified by 1 digit upper case English letter, which is used as an additional
distinguish code when distinguish is required in case structure, principal parameter or oil supply
mode etc. has changed (for example, the stroke of engine has changed or the engine is a dual fuel
engine) with number of cylinders, bore and characteristic code of the engine unchanged. For
changes of peripheral parts of the engine (such as intake and exhaust manifolds), the engine model
will keep unchanged, and engine assembly number will be changed for distinguish. Among the
engines of the same series, the specification code will be used with “B” as the first (among which,
do not use such letters as “I”, “O”, “Q”, “X” and “Z”). The default specification code for the first
fundamental structure is “A”, which is omitted. The specification also can quote the characteristic
code to express specific characteristics.
Position of engine model
The engine model should be printed at an obvious part on engine cylinder block and please
see provisions in Assembly and Regulation Instruction of Engine for the specific position.
Leaving factory number of engine is composed of characteristic code of engine, EFI manufacturer
code, character code of the year of production, character code of the month of production,
sequence number of this engine among the engines of this model manufactured in that month and
start stop sign “*”. Complete form of leaving factory number of a engine is as follows:
* □ □ □ ○○○○○ *
Character code of the month
Among which, ○ indicates an Arabic numeral, □ indicates a letter and indicates an Arabic
numeral or a letter.
The characteristic code of engine should conform to above provision.
EFI system manufacturers: C-Motorola; D-Marelli; E-Delphi; F-UAES; G-Siemens; H-Troitec;
B-Bosch
EFI system manufacturer code
SN among the volume of
production of the current month
Character code of the year
Characteristic code
Chapter Two Specification
I. Engine Type and Major Parameters
Basic Parameters
Item
SQR473
SQR473H
SQR473F
No.
Type
Vertical type, 4 cylinder, water cooling, 4
stroke, in-line double overhead camshaft,
controlled burn rate, variable valve timing
Vertical type, 4 cylinder, water
cooling, 4 stroke, in-line double
overhead camshaft
1
Model
SQR473H
SQR473F
2
Fuel Supply Mode
Multi point electric control gasoline injection
3
Cylinder Diameter
(mm)
73.0
4
Piston Stroke (mm)
77.5
5
Working volume
(L)
1.297
6
Compression Ratio
10.0
7
Type of
Combustion
Chamber
Ridge type
8
Ignition Sequence
1-3-4-2
9
Fuel Designation
(not less than)
93# lead-free gasoline
10
Volume of Engine
Oil (L)
3.5 (new engine oil filter)
11
Engine Oil
Designation
SAE10W-40 (grade SJ or above)
12
Crankshaft
Rotational
Direction
Clockwise (see from engine belt)
13
Starting Mode
Electric starting
14
Cooling Mode
Mandatory circulating antifreeze cooling
15
Lubricating Mode
Combined type (pressure and splash lubrication)
16
Net Mass (kg)
105
100
Crank Angle with
Intake Valve
Opening as 1mm
(°)
400
369
Crank Angle at
1mm before Intake
Valve Closing (°)
610
569
Crank Angle with
Exhaust Valve
Opening as 1mm
(°)
200
140
17
Crank Angle at
1mm before
Exhaust Valve
Closing (°)
390
350
18
Ignition Advance
Angle (°CA)
12±5
12±5
19
Cylinder
Compression
Pressure (MPa)
(200~300r/min)
1.00~1.35
20
Overall Dimension
(length×width×height)
613×507×734
21
Electronic fuel
injection system
UAES
II. Major Maintenance Parameters of Engine
No.
Name
Dimension and tolerance
Fit clearance
1
473 engine cylinder hole
φ73.005±0.005
2
Piston skirt of 473 engine
φ72.965±0.009
0.04
Main bearing saddle width of cylinder
19.5
0
-0.05
Thickness of thrust plate
2.4
+0.05
0
3
Crankshaft main journal
24.5
+0.015
-0.030
0.07~0.265
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