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Chery A15. Manual - part 10

Size of intake valve seat ring and cylinder head

eat ring bore

Class

Diameter of

intake

valve seat

ring (unit:

mm)

Diameter of

the seat ring

bore of

cylinder

head (mm)

Interfer

ence

(mm)

Standard

43.877

−

43.763

025

Oversized

0.5

44.377

−

025

44.263

Oversized

1.0

44.877

−

025

44.763

0.079

—

0.124

Size of exhaust valve seat ring and cylinder head seat ring bore

Class

Diameter of exhaust valve

seat ring (mm)

Diameter of cylinder head

seat ring bore (mm)

Interference

(mm)

Standard

38.877

−

38.263

025

Oversized

0.5

39.377

−

38.763

025

Oversized

1.0

39.877

−

39.263

025

0.079—0.124

UAES’s

new

two-valve

38.377

−

38.263

025

Oversized

0.5

38.877

−

38.763

025

Oversized

1.0

39.377

−

39.263

025

0.079—0.124

Size of valve guide and valve guide bore

Class

Valve guide bore

(unit: mm)

Diameter of cylinder head

guide hole (unit: mm)

Interference

(unit: mm)

Standard

13.555

−

13.481—13.519

Oversized

14.305

−

14.231—14.269

Oversized

14.505

−

14.481—14.519

0.026—0.07

B-16

COMPRESSION PRESSURE

COMPRESSION INSPECTION

Warning

·Hot engines and oil can cause severe burns. Be careful not to burn yourself during

removal/installation of each component.

1. Verify that the battery is fully charged.

·Recharge it if necessary.

2. Warm up the engine to the normal operating temperature.

3. Stop the engine and allow it to cool off for about 10 min.

4. Perform “Fuel Line Safety Procedures”. Leave the fuel pump relay removed.

Warning

·Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage.

Always keep sparks and flames away from fuel.

·Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries

or death and damage. Fuel can also irritate skin and eyes. To prevent this, always
complete the “Fuel Line Safety Procedure”.

5. Remove the ignition coil connector.

6. Remove the spark plugs.

7. Connect a compression gauge into the spark plug

hole.

8. Fully depress the accelerator pedal and crank the

engine.

9. Note the maximum gauge reading.

10. Inspect each cylinder as above.

·If the measured value is less than the limited value, or there is a cylinder whose

compression value varies from that of other cylinders, add a small amount of engine oil
through the spark plug hole. Then measure the compression pressure and perform the
respective operations for the following cases.

— If the compression increases, the piston, the piston rings, or cylinder wall may be worn

and overhaul is required.

— If the compression stays low, a valve may be stuck or improperly seated and overhaul is

required.

— If the compression in adjacent cylinders stays low, the cylinder head gasket may be

damaged or the cylinder head distorted and overhaul is required.

B-17

Cylinder Pressure Standard Value：1.00-1.35 Mpa (10-13.5 kgf/cm2)

11. Disconnect the compression gauge.

12. Install the spark plugs.

13. Connect the ignition coil connector.

14. Install the fuel pump relay.

B-18

CYLINDER HEAD GASKET

CYLINDER HEAD GASKET
REPLACEMENT

Removal

Rotate the cam shaft clockwise until the key slot
goes downwards vertically.

Loosen the bolts on the cylinder head in the order
illustrated in the figure.

Note: The bolts removed from the cylinder head

must be changed and cannot be reused.

Inspection and Installation

Check the out-of-flat of the base plane of the
cylinder head, which shall not be above 0.15mm.

Clean the threaded holes of the cylinder block. No
lubricant shall be settled in the threaded holes,
otherwise the liquid pressure may lead to the
cracking of the cylinder block after the bolts are
screwed in.

Rotate the crank shaft clockwise to the position
that enables the piston of the first cylinder to be
about 20mm lower than the top plane of the
cylinder block, thus to avoid the valve to collide
with the top of the piston when installing the
cylinder head assembly.

B-19

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