Engine Compression Testing

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Presentation transcript:

Engine Compression Testing R. Bortignon

Engine Condition Analysis – Compression Testing A compression test tells us what the physical condition of the engine is… 1. Remove all the spark plugs 2. Disable the ignition system (yellow arrows) (unhook negative side of the coil) Ignition Coils

3. screw a threaded adapter into one of the spark plug holes 4. crank the engine through 5 compression strokes 5. record your reading and repeat #1 thru #4 on the remaining cylinders Pressure Gauge Adapter Coupler Various Threaded Adapters

4 5 3 2 1

Interpreting the Readings Check “Mitchell” for the compression specifications of your vehicle (in the engine performance section) Low compression is usually the result of a leaking valve

Burnt valves can be caused by insufficient valve clearance

worn compression rings and/or cylinder walls…

Interpreting the Readings or a blown cylinder head gasket…

Diagnosing Low Compression Readings Engine Spec’s: 150 PSI +/- 10% Cylinder #1: 150 PSI Cylinder #2: 160 PSI Cylinder #3: 70 PSI Cylinder #4: 150 PSI Probable Cause: Leaking valve

Engine Spec’s: 140 PSI +/- 10% Cylinder #1: 90 PSI Cylinder #2: 105 PSI Cylinder #3: 100 PSI Cylinder #4: 105 PSI Probable cause: worn rings and cylinders

Engine Spec’s: 160 PSI +/- 10% Cylinder #1: 20 PSI Cylinder #2: 20 PSI Cylinder #3: 150 PSI Cylinder #4: 140 PSI Probable cause: blown head gasket

Engine Spec’s: 150 PSI +/- 10% Cylinder #1: 190 PSI Cylinder #2: 210 PSI Cylinder #3: 200 PSI Cylinder #4: 195 PSI Probable cause: excessive carbon build-up