COMPRESSION PRESSURE — Measurement of Compression Pressure
EM-7005prose procedureMeasurement of Compression Pressure
- 1Warm up engine.
- 2Turn ignition switch off.
- 3Release fuel pressure. Refer to section EF & EC.
- 4Disconnect and remove ignition coils.
NEM361 - 5Remove all spark plugs.
- 6Attach a compression tester to No. 1 cylinder.Use compressor tester whose end (rubber portion) is less than 20 mm (0.79 in) dia. Otherwise, it may be caught by cylinder head during removal.
SEM387C - 7Depress accelerator pedal fully to keep throttle valve wide open.
- 8Crank engine and record highest gauge indication.
- 9Repeat the measurement on each cylinder as shown above.Always use a fully-charged battery to obtain specified engine revolution.
- 10If cylinder compression in one or more cylinders is low, pour a small amount of engine oil into cylinders through spark plug holes and retest compression.If adding oil helps compression, piston rings may be worn or damaged. If so, replace piston rings after checking piston.If pressure stays low, a valve may be sticking or seating improperly. Inspect and repair valve and valve seat. (Refer to S.D.S.) If valve or valve seat is damaged excessively, replace them.If compression in any two adjacent cylinders is low and if adding oil does not help compression, there is leakage past the gasket surface. If so, replace cylinder head gasket.
| Specification | Value |
|---|---|
| Compression pressure — StandardStandard | 1,324 (13.2, 13.5, 192) / 350kPa (bar, kg/cm², psi) / rpm |
| Compression pressure — MinimumMinimum | 1,128 (11.3, 11.5, 164) / 350kPa (bar, kg/cm², psi) / rpm |
| Compression pressure — Difference limit between cylindersDifference limit between cylinders | 98 (0.98, 1.0, 14) / 350kPa (bar, kg/cm², psi) / rpm |
Compression pressure — StandardStandard
1,324 (13.2, 13.5, 192) / 350kPa (bar, kg/cm², psi) / rpm
Compression pressure — MinimumMinimum
1,128 (11.3, 11.5, 164) / 350kPa (bar, kg/cm², psi) / rpm
Compression pressure — Difference limit between cylindersDifference limit between cylinders
98 (0.98, 1.0, 14) / 350kPa (bar, kg/cm², psi) / rpm