Chery QQ6 (SQR473F Engine-Mechanical). Service Manual — part 4

5. Use an 8# sleeve to remove the four fixing bolts of

oil pump.

Torque: 8+3Nm

6. Take off the oil pump assembly and then the oil pump

shim.

Note:

Do not split the oil pump shim forcibly when

disassembling for fear to cause leak.

7. Use an hexagon wrench to remove the two

connecting bolts of oil pump.

8. Use a screwdriver to pry the crankshaft front oil seal

and then take out the oil seal.

II. Overhaul of Oil Pump

if it is suspected that engine oil pressure may has problem,

disassemble the oil pump and check elastic force of relief

valve spring and if the valve is locked.

Note:

The oil pump is of inner rotor type, which can not

be maintained under normal conditions, because its finish

size and material ensure its reliability.

III. Installation Procedure

The installation order is adverse to that for disassembly,

but care should be taken for the following matters.

1. The installation direction of oil pump relief valve is as

shown in the figure.

2. Completely and softly shovel off the glue on the surface

of oil pan with a flat shovel and then apply new sealant

uniformly (see the table above for type of the sealant).

Note:

As soon as new sealant is applied properly,

assemble at once; otherwise, the sealant may freeze,

which may affect the sealing effect.

Chapter Thirteen Disassembly of Crank-Connecting Rod

Mechanism

I. Disassembly Procedure

1 Use a 13# sleeve to remove the fixing bolt of clutch

cover.

Torque: 23±2 Nm

2. Use the special tool CH-20009 to lock the crankshaft

and then use a 13# sleeve to remove the connecting bolt

of flywheel and crankshaft.

3. Use a 13# sleeve to loosen the fixing bolt of

connecting rod bearing cylinder by cylinder and then

take off the piston and connecting rod assembly.

Note:

After the pistons are taken out of the cylinders,

reset and connect the bearing caps of connecting rod big

end and bolts properly and then put them by order.

4. Use a 10# sleeve to remove the fixing bolt of

crankshaft lower bearing cap and cylinder block.

5. Use a 19# sleeve to remove the fixing bolt of

crankshaft main bearing cap.

Note:

The surface between cylinder block and bearing cap

is ensured by high precision machining plane, so, do not

use any hard article to scuff this surface.

6. Take off crankshaft rear oil seal assembly, remove

bearing shell cover, and then take off crankshaft

assembly.

II. Overhaul of Crank-Connecting Rod System

1. Detection of crankshaft.

1.1 Detection of crankshaft main journal: use an

outside micrometer to measure main journal of

crankshaft and the normal value should be

46.01mm.

1.2 Detection of connecting rod journal: use an

outside micrometer to measure connecting rod

journal of crankshaft and the normal value should

be 44.485-44.495mm.

1.3 Measurement of main journal clearance: place

a plastic feeler gauge on the crankshaft main

journal, tighten the main bearing shell cover to

specified torque and then loosen it, use the

thickness check list on the plastic feeler gauge to

read the value. The normal value should be:

0.02-0.06mm. Use the same method to measure

connecting rod journal clearance.

1.4 Measurement of crankshaft axial clearance:

tighten the main bearing shell cover to specified

torque and then use a dial gauge to measure the

crankshaft axial clearance. When measuring, push

the crankshaft off the dial gauge first and keep the

dial gauge has certain amount of compression, set

the pointer to zero, and then push the crankshaft to

the adverse direction and the numerical value

fetched from the dial gauge will be the crankshaft

axial clearance. The normal value should be

0.02-0.30mm. If exceeding this scope, replace the

crankshaft thrust sheet or the crankshaft.

2. Detection of piston

2.1 Detection of piston diameter: use an outside

micrometer to measure the piston diameter. When

measuring, remember to measure at the place about

11mm up from lower end of the piston. The normal

value should be φ72.965±0.009.

2.2 The piston pin is of semi-floating type, which

can not be disassembled during maintenance,

because it can not be assembled using common

machining technique after disassembled. If

abnormal noise occurs due to improper piston pin

clearance, replace the piston assembly.

2.3 Measurement of piston ring.

2.3.1 Measurement of piston ring end play: first,

place the piston ring into cylinder.

2.3.2 Push the piston head vertically against the

piston ring in the cylinder and let the piston ring be

on a plane.

2.3.3 Use a feeler gauge to measure the gap

between piston ring ends and the normal value

should be: 0.2mm.

2.3.4 Measurement of piston ring side clearance:

place the removed piston ring into the ring groove

(lean to one side as possible) and then place a

feeler gauge into the other side to measure the

clearance; certain resistance feeling after the feeler

gauge is placed in indicates that the measurement

with feeler gauge will be correct. The normal value

should be 0.03mm. Unit: mm

Contents

First ring

Second ring Third ring

End play

0.2

0.4

/

Side

clearance

0.03

0.03

/

Thickness

1.2

1.6

/

3. Measurement of roundness and cylindricity of

cylinder

3.1 Select appropriate cylinder gauge and outside

micrometer.

3.2 Use a vernier caliper to measure rough

diameter of the cylinder hole.

3.3 Adjust the outside micrometer to the data

measured out by the vernier caliper, select the

splicing pole suitable to the range of the cylinder

gauge, and then set the outside micrometer to zero

according to this data.

3.4 Place the cylinder gauge into the cylinder to

measure; when measuring, the yawing angle of

cylinder gauge should not exceed 15º. Fetch the

maximum numerical value.

3.5 The measuring position of the cylinder gauge

in cylinder is as shown in the figure.

Calculation method for roundness: A-B or a-b

Calculation method for cylindricity: the difference

of maximum diameter subtracting minimum

diameter among A, a, B, and b.

The normal value should be: if roundness or

cylindricity exceeds the range, replace with new

cylinder block or install new cylinder sleeve.

3.6 Measurement of planeness of cylinder block:

use steel rule and feeler gauge to measure

planeness of the cylinder block. If the planeness

exceeds the range, replace the cylinder block.

Upper stop position of piston

Lower stop position of piston

III. Installation of Crank-Connecting Rod System

The installation order is adverse to that for

disassembly, but care should be taken for the

following matters. 1. Installation of crankshaft thrust

sheet.

When installing the crankshaft thrust sheet, leave

the side with oil groove outwards.

2. Installation of crankshaft front oil seal

2.1 Clear smudge on oil seal seat ring, and then

apply a layer of lubricant on the seat ring.

2.2 Apply a layer of engine lubricant on the oil seal

lip.

2.3 Enclose the new oil seal with lubricant applied

into the special tool. Press the special tool against

the oil seal seat ring and softly strike to compact.

3. Installation of crankshaft rear oil seal

3.1 Clean the oil seal seat ring. Dip engine oil with a

piece of gauze and then use it to clear the impurities

inside the oil seal seat ring.

3.2 Apply a layer of engine oil uniformly on

crankshaft rear oil seal lip and a little engine oil

uniformly on outer ring of oil seal. Envelope the oil

seal onto the special tool and then press it into the

oil seal seat ring.

4. When installing cylinder cushion, install it with

the side with word up.

Note:

The cylinder cushion has been applied with

sealant, so, providing that the cylinder head or cylinder

block has been disassembled, be sure to replace the

cylinder cushion.

5. When installing piston ring, remember to leave

the side of the second ring with word up.

6. The opening position of the piston ring during

installation is as shown in the figure.

7. The label on piston head prompts direction and

position of installation.

8. Use a special tool to install the piston ring.

9. When installing connecting rod bearing shell, pay

attention to installation mark.

First ring

Second ring

Oil ring

First ring

Second ring

Front Liner ring

Rear

Lower blade

Upper blade

10. Method for shell matching.

The tightening torque for installing the fixing bolt of

connecting rod bearing is 25±3Nm (then turn 90±5°

clockwise).

Note:

The machining technique for connecting

rod and connecting rod shell cap adopts Instantly

Swell and Break machining method, so, each

machined surface maintains the shape of original

material. When installing, keep any sundries out

of this machined surface. In addition, only the

two machined surface of the same connecting rod

can completely engage.

11. Use the piston installation special tool to install

the piston.

12. Tighten the fixing bolt of connecting

rod bearing cap.

Tightening torque:

First time: 25±3Nm. Second time: turn

90±5 °.

13. Install the main bearing cap and then

follow the order as shown in the figure to

tighten the bolt.

Tightening torque:

First time: 45±5Nm.

Second time: turn 180±10°.

14. Tighten the fixing bolt of main

bearing cap and cylinder block.

Torque: 20+3 Nm.