Compression Pressure

EM-158prose procedure

1
Warm up engine.
2
Turn ignition switch off.
3
Disconnect fuel cut solenoid valve connector.
SEM380D
4
Remove all spark plugs.
5
Disconnect distributor center cable.
6
Attach a compression tester to No. 1 cylinder.
SMA036A
7
Depress accelerator pedal fully to keep throttle valve wide open.
8
Crank engine and record the highest gauge indication.
9
Repeat the measurement on each cylinder as shown above.
Always use a fully-charged battery to obtain checking engine revolution.
Compression pressure: kPa (bar, kg/cm2, psi)/350 rpm
Standard: 1,245 (12.45, 12.7, 181)
Minimum: 981 (9.81, 10.0, 142)
Difference limit between cylinders: 98 (0.98, 1.0, 14)
10
If 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 - Standard12.45 bar, 12.7 kg/cm2, 181 psi / 350 rpm	1,245kPa
Compression pressure - Minimum9.81 bar, 10.0 kg/cm2, 142 psi / 350 rpm	981kPa
Compression pressure - Difference limit between cylinders0.98 bar, 1.0 kg/cm2, 14 psi	98kPa

Compression pressure - Standard12.45 bar, 12.7 kg/cm2, 181 psi / 350 rpm

1,245kPa

Compression pressure - Minimum9.81 bar, 10.0 kg/cm2, 142 psi / 350 rpm

981kPa

Compression pressure - Difference limit between cylinders0.98 bar, 1.0 kg/cm2, 14 psi

98kPa

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