Compression Check: Testing and Inspection

SPECIAL TOOLS:
- Compression Gauge tool No. 999 9689, or equivalent
- Starter Switch tool No. 115 8263, or equivalent
- Extension tool No. 115 8540, or equivalent






WARNING:
^ THE IGNITION SYSTEM OPERATES AT HIGH POWER, WITH DANGEROUS VOLTAGES IN BOTH THE LOW-TENSION AND HIGH TENSION CIRCUITS.
^ DANGEROUS VOLTAGE LEVELS OCCUR IN ALL PARTS OF THE IGNITION SYSTEM, INCLUDING CONNECTORS AND SIMILAR FITTINGS.

CONDITIONS

Tool No. 115 8540-3 Extension For Compression Tester Tool No. 999 9689-4:

- Measure compression with engine hot with throttle fully open.
- Normal value: 1.3-1.5 MPa (184-213 psi)

NOTE: Above values apply when hot engine is turned at 250-300 rpm using starter motor, with throttle fully open.

PROCEDURE





1. Disconnect/remove:
- timing pick-up connector
- ignition coil cover
- throttle pulley cover





2. Lock throttle in fully-open position
- Use implement such as screwdriver.
- Remove ignition coils and spark plugs.





3. Connect starter switch
- Use starter switch tool No. 115 8263, or equivalent.
- Connect switch between alternator (+) and service socket on left-hand wheel housing.

Tool No. 115 8540-3 Extension For Compression Tester Tool No. 999 9689-4:

4. Measure compression
- Use compression gauge tool No. 999 9689 and extension sleeve tool No. 115 8540, or equivalent.
- Measure compression in all cylinders.





5. Disconnect/Release:
- starter switch connections
- throttle
- Check that throttle cable is seated in pully groove.
- Install throttle pulley cover.





6 Install spark plugs
- Screw in plugs until seal is in contact with cylinder head.
Tighten to 25 Nm (18 ft. lbs).
- Reconnect timing pick-up connector.





7. Reinstall:
- ignition coils
- ignition coil cover