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) Lower the fuel pressure.
4) Remove all the spark plugs.
5) Throttle valve should be wide open.
6) Check the starter motor for satisfactory performance and operation.
7) Hold the compression gauge tight against spark plug hole.
NOTE: When using a screw-in type compression gauge, the screw (put into cylinder head spark plug hole) should be shorter than 18 mm (0.71 inch).
8) Crank the engine by means of starter motor, and then read the maximum value on the gauge when the pointer is steady.
9) Take at least two measurements per cylinder, and make sure that the values are correct.
Compression (350 rpm at wide open throttle):
Standard; 1,275 kPa (13.0 kgf/cm2, 185 psi)
Limit: 1,079 kPa (11.0 kgf/cm2, 148 psi)
Difference between cylinders: 49 kPa (0.5 kgf/cm2, 7 psi), or less