Sonata GL V6-3.0L (1997)
Compression Check: Testing and Inspection
1. Before checking compression, check the engine oil level.
Also check that the starter motor and battery are all in normal operating condition.
2. Start the engine and wait until engine coolant temperature reaches 80-95°C (176-205°F).
3. Stop the engine and disconnect the spark plug cables.
4. Remove the spark plugs.
5. Crank the engine to remove any foreign objects in the cylinders.
6. Attach the compression gauge to the spark plug hole.
7. Depress the accelerator pedal to fully open the throttle.
8. Crank the engine and read the gauge.
Standard Value: 1,200 kPa (170 psi)
Wear Limit: 1,050 kPa (149 psi)
9. Repeat steps 6 through 8 on all cylinders, ensuring the pressure differential for each of the cylinders is within the specified limit.
Maximum pressure differential between cylinders: 100 kPa (14 psi)
10. If a cylinder's compression or pressure differential is below the specification, add a small amount of oil through the spark plug hole, and repeat
steps 6 through 9.
NOTE:
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If the addition of oil brings the compression up, there may be wear between the piston ring and cylinder wall.
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If compression remains the same, valve seizure, poor valve seating or a compression leak from the cylinder head gasket are all possible causes.
11. Install spark plugs, tighten to 20-30 Nm (14-22 ft. lbs.).
