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  • Compression Test / Leak Down Test

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    Mopar1973Man

    CYLINDER COMPRESSION/LEAKAGE TESTS

     

    CYLINDER COMPRESSION PRESSURE
    The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunctions.
    Ensure batteries are completely charged and the engine starter motor is in good operating condition. Otherwise, the
    indicated compression pressures may not be valid for diagnostic purposes.
    1. Disconnect the fuel inlet line to the fuel filter housing. Plug the fuel line from the fuel tank.
    NOTE: Failure to plug fuel line will result in fuel leak.
    2. Remove fuel transfer pump relay from PDC.
    3. Start the engine and idle until the engine stalls (runs out of fuel).
    4. Remove the cylinder head cover. (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - REMOVAL)

    5. Remove the cylinder head cover carrier gasket. (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - REMOVAL}
    6. Remove the high pressure fuel line between the cylinder head and fuel rail for the cylinder to be tested. Use tool 9864 to cap this fuel rail on the cylinder being tested.
    7. Remove the fuel connector tube nut and fuel connector tube.
    8. Remove the exhaust rocker lever.
    9. Use Tool 9010 to remove the injector and copper sealing washer.
    10. Install the exhaust rocker lever and torque to 36 N·m (27 ft. Ibs.).
    11. Cover the remaining rocker levers with clean shop towels to prevent any oil splatter under the hood.
    12. Place a rag over the compression test tool fitting. Crank the engine for 2-3 seconds to purge any fuel that may have drained into the cylinder when the injector was removed.
    13. Connect the compression test gauge.
    14. Crank the engine for 5 seconds and record the pressure reading. Repeat this step three times and calculate the average of the three readings.
    NOTE: The minimum cylinder pressure is 350 psi. Cylinder pressure should be within 20% from cylinder to cylinder.
    15. Combustion pressure leakage can be checked if cylinder pressure is below the specification. Perform the leakage test procedure on each cylinder according to the tester manufacturer instructions.
    16. Upon completion of the test check and erase any engine related fault codes.

     

    CYLINDER COMBUSTION PRESSURE LEAKAGE
    The combustion pressure leakage test provides an accurate means for determining engine condition.

     

    Combustion pressure leakage testing will detect:
    • Exhaust and intake valve leaks (improper seating).
    • Leaks between adjacent cylinders or into water jacket.
    • Any causes for combustion/compression pressure loss

     

    1. Start and operate the engine until it attains normal operating temperature.
    2. Disconnect injector harness connectors.
    3. Disconnect CCV tube and breather drain tube from valve cover.
    4.Remove the cylinder head cover. (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - REMOVAL)
    5.Disconnect harness from injectors.
    6.Remove the cylinder head cover carrier gasket. (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - REMOVAL)
    7. Bring the cylinder to be tested to TDC.
    8. Remove the high pressure fuel line between the cylinder head and the fuel rail for the cylinder to be tested.
    9. Install capping Tool 9864 onto the rail.
    10. Remove the high pressure connector nut and high pressure connector with Tool 9015.
    11. Remove the exhaust and intake rocker lever.
    12. Use Tool # 9010 to remove the injector and copper sealing washer.
    13. Install compression test Tool # 9007 into the' injector bore.
    14. Connect the leakage tester and perform the leakage test procedure on each cylinder according to the tester manufacturer's instructions.
    15. Upon completion of the test check and erase any engine related fault codes.



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