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Home >> Jeep >> 1987 >> Comanche Base, 2.1 B >> Repair and Diagnosis (Single Page) >> Engine Performance >> Adjustment >> Tune-Up - 4-CYL >> Testing >> Engine Compression

Engine Compression

Test compression with all spark plugs removed and engine at normal operating temperature. Crank engine through at least 5 compression strokes before recording reading.

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio 9.2:1
Compression Pressure 155-185 psi
Max. Variation Between Cyls. 30 psi
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