Chery QQ6 (S21) / S12LHD. Manual — part 224

Pressure gauge for cylinder: used to measure cylinder

pressure. When measuring, remove spark plug first,

screw instrument pipe orifice into the position of spark

plug, use starter to drag the engine to rotate, and then

fetch the maximum reading of the pressure gauge for

cylinder as cylinder pressure of this cylinder.

Chapter Four Measurement of Cylinder Pressure

I. Detection of Cylinder Pressure

Measurement of cylinder pressure is the major index for judgment of engine working condition,

through which, we can definitely judge if a certain system of engine works well. Therefore, during

maintenance of engine, measurement of cylinder pressure is indispensable.

1. Measuring process

1.1 Turn off ignition switch, pull out all ignition cables

from spark plug side, and then pull out harness

connector of injection nozzle.

1.2 Use a spark plug sleeve to loosen the spark plug

whose cylinder will be measured. Explanation: do not

remove the spark plug whose cylinder will not be

measured.

Please select a cylinder pressure

gauge with accurate reading and let its

pointer return to zero; otherwise, it may affect

accuracy of reading.

1.3 Screw the cylinder pressure gauge joint slowly and

vertically into the spark plug hole. Do not screw too

tightly for fear that it may be difficult to disassemble.

1.4 Step down clutch pedal, start the engine and let it

run for about 5-6s, then fetch the numerical value.

2. Judgment of cylinder pressure value

2.1 Correct cylinder pressure

The standard cylinder pressure value should be

10-13.5bar. With use of engine, this value will fall, but

it should not be below 9bar with the pressure

difference among cylinders not exceeding 3bar.

2.2 In case cylinder pressure of engine is below the

standard value, it indicates deficiency of cylinder

pressure, the main cause of which may be untight

piston ring seal or valve. Please further analyze and

check.

When starting the engine,

ensure

adequate

quantity

of

electricity. Correct cylinder pressure can

only be measured out with revolution of

engine as 200-300r/min.

Chapter Five Disassembly of Power-assisted Steering System

I. Disassembly Procedure

1. Use a snap ring pliers to loosen the clamp on

connecting hose of steering fluid reservoir and steering

pump. Use a clean container to reclaim the steering fluid.

2. Use a 21# sleeve to remove the fixing bolt of steering

pump oil pipe.

Torque: 20+5Nm.

3. Use a 10# sleeve to loosen the (upper) fixing bolt of

steering pump adjusting bracket.

Torque: 20+5Nm.

4. Use a 10# sleeve to loosen the (lower) fixing bolt of

steering pump adjusting bracket.

Torque: 20+5Nm.

5. Use a 10# open end wrench to loosen the adjusting

bolt of steering pump bracket, and then pull the steering

pump upwards to loosen and take off the belt.

6. Use a 10# sleeve to loosen the connecting bolt of

steering pump and compressor bracket, pull out harness

connector, and then dismount the steering pump

assembly.

II. Overhaul

Steering pump can not be repair, if such failure as abnormal noise or oil leak exists, replace the

assembly.

III. Installation of the Steering Pump

1. Follow the order adverse to that of disassembly to install.

2. After installation of steering oil pump, duly adjust tightness of belt through adjusting bolt.

3. After power steering pump is properly installed, refill with special steering pump oil, and then

bleed air for the power steering pump after the engine starts.

4. Air bleeding method:

4.1 Hoist the vehicle to let its front wheels leave ground.

4.2 Turn the steering wheel left and right to the ends (duration for each time should not exceed 5s,

otherwise, the power steering pump is likely to be burnt out) until the oil pump does not make

sound. Note that oil storage kettle should not be lack of steering pump oil.

Note: when dismounting the

steering pump, please block the oil

pipe joint with clean cotton cloth.