COMPRESSION INSPECTION [G6]

id011095800300

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

4. Perform "Fuel Line Safety Procedure". Leave the fuel pump relay removed. (See BEFORE REPAIR PROCEDURE [G6].)

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

6. Remove the spark plugs.

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

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

9. Note the maximum gauge reading.

10. 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}

11. Disconnect the compression gauge.

12. Install the spark plugs.

Tightening torque

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

13. Connect the igniter connector.

14. Install the fuel pump relay.