Compression Pressure; Compression Inspection - Chery automobile Service Manual

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,
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.

COMPRESSION PRESSURE

B-17
or there is a cylinder whose