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Mazda 6 Service Manual: Compression pressure

Mazda 6 Service Manual / Engine / Compression pressure

COMPRESSION INSPECTION

Warning

1. Verify that the battery is fully charged.

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. (See BEFORE REPAIR
PROCEDURE.)

Warning

5. Remove the ignition coil connector.


6. Remove the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION.)

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 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

kPa {kgf/cm2, psi} [rpm]


kPa {kgf/cm2, psi} [rpm]


kPa {kgf/cm2, psi} [rpm]


11. Disconnect the compression gauge.

12. Install the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION.)

13. Connect the ignition coil connector.

14. Install the fuel pump relay. (See BEFORE REPAIR PROCEDURE.)

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