Chery QQ6 (S21) / S12LHD. Manual — part 229

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

compressor bracket.

Torque: 30±3 Nm.

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

manifold and then take off the intake manifold assembly.

Torque: 8+3Nm.

Chapter Eleven Disassembly of Cylinder Head

I. Disassembly Procedure

1 Use a 10# sleeve to remove the fixing bolt of valve

cover.

Torque: 8±3 Nm.

2. Get the special tool CH-20010 stuck into the

groove on camshaft.

3. Use a 18# sleeve to loosen the fixing bolt of

camshaft timing gear.

Torque: 120±5Nm.

Note:

There is no difference between intake

camshaft and exhaust camshaft, they can be interchanged.

4. Use a cross-head screwdriver to loosen the fixing

bolt on inner fender of timing gear and then take out

the inner fender of timing gear.

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

camshaft bearing, take out the camshaft assembly

and then the hydraulic tappet system.

Torque: 9.5±1.5 Nm.

Note:

The positions of both camshaft bearing and

bolts, including the order of camshaft bearing, are

unchangeable, and should be conformity with the marks

during assembly/disassembly.

6. Use an hexagon torque wrench to loosen the

fixing bolt of cylinder head and then take off the

cylinder head assembly.

Torque: 50±5 Nm.

Note:

Follow the order as shown in the figure to

loosen the fixing bolts of cylinder head.

7. Disassembly of valve

7.1 Use a special tool to press down the valve

spring, take out the locking plate, and then take off

valve spring, valve and valve seat insert.

7.2 Use a special tool to pull out the valve oil seal.

II. Overhaul of Cylinder Head System

1. Detection of camshaft

1.1 Measurement of height of cam. Use an outside

micrometer to measure wheel height of the cam.

Wheel height of the intake camshaft: 37.11mm.

Wheel height of the exhaust camshaft: 37.09mm.

1.2 Inspection of camshaft journal. Use an outside

micrometer to measure each journal of the camshaft,

please see Specification Table for specific data.

2. Detection of valve

2.1 Detection of valve spring. Two items of data of

valve spring should be measured.

Length of the spring: 49mm

Squareness of the spring: 1.2mm (limit)

2.2. Detection of valve.

2.2.1 Measurement of diameter of valve stem

Measurement point