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 spark plugs.
5) Fully open the throttle valve.
6) Check the starter motor for satisfactory performance and operation.
7) Hold the compression gauge tightly against the spark plug hole.
NOTE: When using a screw-in type compression gauge, the screw should be less than 18 mm (0.71 in) long.
8) Crank the engine by the starter motor, and read the maximum value on the gauge when the needle of gauge is steady.
9) Perform at least two measurements per cylinder, and check that the values are correct.
Compression (throttle full open):
Standard 1,020 - 1,275 kPa 2 (10.4 - 13.0 kgf/cm2, 148 - 185 psi)
Service limit 1,020 kPa (10.4 kgf/cm2, 148 psi)
Difference between cy1inders 49 kPa (0.5 kgf/cm2, 7 psi), or less
10) After inspection, install the related parts in the reverse order of removal.