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Home >> Austin >> 1974 >> Marina Base, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Tune-Up Procedures - 4-Cylinder >> Engine Compression

Engine Compression

Check compression with engine at normal operating temperature and all spark plugs removed. Compression pressure should be 170 psi (11.9 kg/cm2 ). Compression variance between highest and lowest cylinder should not exceed 20%.