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Home >> Opel >> 1974 >> 1900 Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Tune-Up Procedures - 4-Cylinder >> Engine Compression

Engine Compression

Check compression pressure with engine at normal operating temperature. Remove all spark plugs and air cleaner element. Hold throttle valve wide open and crank engine at 300 RPM (minimum). Maximum variation between cylinders should be 9 psi (.63 kg/cm2 ).

COMPRESSION PRESSURE SPECIFICATIONS

Application Min. Pressure psi (kg/cm2 ) Std. Pressure psi (kg/cm2 )
All Models 120(8.4) 170(12)