COMPRESSION PRESSURE - Measurement of Compression Pressure

EM-13prose procedure

1
Warm up engine.
2
Turn ignition switch off.
3
Release fuel pressure. Refer to section EF & EC.
4
Remove all spark plugs.
5
Disconnect distributor center cable.
6
Attach 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.
SEM149D
7
Depress accelerator pedal fully to keep throttle valve wide open.
8
Crank engine and record highest gauge indication.
9
Repeat the measurement on each cylinder as shown above.
Always use a fully-charged battery to obtain specified engine revolution.
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 - StandardFully-charged battery; specified engine revolution	1324 (13.2, 13.5, 192) / 350kPa (bar, kg/cm², psi) / rpm
Compression pressure - Minimum	1128 (11.3, 11.5, 164) / 350kPa (bar, kg/cm², psi) / rpm
Compression pressure - Difference limit between cylinders	98 (0.98, 1.0, 14) / 350kPa (bar, kg/cm², psi) / rpm

Compression pressure - StandardFully-charged battery; specified engine revolution

1324 (13.2, 13.5, 192) / 350kPa (bar, kg/cm², psi) / rpm

Compression pressure - Minimum

1128 (11.3, 11.5, 164) / 350kPa (bar, kg/cm², psi) / rpm

Compression pressure - Difference limit between cylinders

98 (0.98, 1.0, 14) / 350kPa (bar, kg/cm², psi) / rpm

Specification	Value
Compression tester rubber end diameterTo avoid catching on cylinder head during removal	less than 20mm (0.79 in)

Compression tester rubber end diameterTo avoid catching on cylinder head during removal

less than 20mm (0.79 in)

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