Compression Check: Testing and Inspection
COMPRESSIONINSPECTION
CAUTION: After warming-up, engine becomes very hot. Be careful not to burn yourself during measurement.
1. After warming-up the engine, turn the ignition switch to OFF.
2. Make sure that the battery is fully charged.
3. Release the fuel pressure.
4. Remove all the spark plugs.
5. Fully open the throttle valve.
6. Check the starter motor for satisfactory performance and operation.
7. Fix the compression gauge securely against the spark plug hole.
NOTE: The screw of screw-in type compression gauge (put into cylinder head spark plug hole) should be less than 18 mm (0.71 inch) long.
8. Crank the engine by means of the starter motor, and then read the maximum value on the gauge when the needle of gauge is steady.
9. Perform at least two measurements per cylinder, and make sure that the values are correct.
Compression (350 rpm and fully open throttle):
Standard. 2 1,020 - 1,275 kPa (10.4 - 13.0 kgf/cm2, 148 - 185 psi)
Difference between cylinders: 49 kPa (0.5 kgf/cm2, 7 psi) or less