COMPRESSION INSPECTION [G6]

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Warning

• When the engine and the oil are hot, they and badly burn. Be careful not to burn yourself during removal/installation of each component.

1. Verify that the battery is fully charged. Recharge it if necessary. (See BATTERY RECHARGING [G6].)

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

3. Perform "Fuel Line Safety Procedure". Leave the fuel pump relay removed. (See BEFORE SERVICE PRECAUTION [G6].)

4. Disconnect the igniter connector. (See IGNITION COIL REMOVAL/INSTALLATION [G6].)

5. Remove the spark plugs.

6. Connect a compression gauge into the No.1 spark plug hole.

7. Fully depress the accelerator pedal and crank the engine.

8. Note the maximum gauge reading.

9. Inspect compression of each cylinder.

• If the compression in one or more cylinders is low or the compression difference between cylinders exceeds the maximum, pour a small amount of clean engine oil into the cylinder and verify the compression.

― 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

Standard: 1255 kPa {12.8 kgf/,cm², 182 psi} [270 rpm]

Minimum: 882.6 kPa {9.0 kgf/,cm², 128 psi} [270 rpm]

Maximum difference between cylinders: 196 kPa {2.0 kgf/,cm², 28 psi}

10. Disconnect the compression gauge.

11. Install the spark plugs.

Tightening torque

15—22 N·m {1.5—2.3 kgf·m, 11—16 ft·lbf}

12. Connect the igniter connector.

13. Install the fuel pump relay.