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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

Model

SQR473H

SQR473F

Fuel Supply Mode

Multi point electric control gasoline injection

Cylinder Diameter

(mm)

73.0

Piston Stroke (mm)

77.5

Working volume

(L)

1.297

Compression Ratio

10.0

Type of

Combustion

Chamber

Ridge type

Ignition Sequence

1-3-4-2

Fuel Designation

(not less than)

93# lead-free gasoline

Volume of Engine

Oil (L)

3.5 (new engine oil filter)

Engine Oil

Designation

SAE10W-40 (grade SJ or above)

Crankshaft

Rotational

Direction

Clockwise (see from engine belt)

Starting Mode

Electric starting

Cooling Mode

Mandatory circulating antifreeze cooling

Lubricating Mode

Combined type (pressure and splash lubrication)

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

Crank Angle at

1mm before

Exhaust Valve

Closing (°)

390

350

Ignition Advance

Angle (°CA)

12±5

Cylinder

Compression

Pressure (MPa)

(200~300r/min)

1.00～1.35

Overall Dimension

(length×width×height)

613×507×734

Electronic fuel

injection system

UAES

II. Major Maintenance Parameters of Engine

No.

Name

Dimension and tolerance

Fit clearance

473 engine cylinder hole

φ73.005±0.005

Piston skirt of 473 engine

φ72.965±0.009

0.04

Main bearing saddle width of cylinder

19.5

-0.05

Thickness of thrust plate

2.4

+0.05

Crankshaft main journal

24.5

+0.015

-0.030

0.07~0.265

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