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Home >> Jaguar >> 2020 >> XF Checkered Flag >> Repair and Diagnosis >> External Pages >> Different car >> Section 109 (Engine System - General Information -- XE (X760)) >> Engine System - General Information >> Cylinder Compression Test - V6 S/C 3.0L Petrol >> General Procedures >> Check

General Procedures: Check

WARNING: This page is about a different car, the 2018 Jaguar XE and 2017 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • The vehicle battery must be in good condition and fully charged before carrying out this procedure.
  • Before disconnecting or removing components, make sure the area around the joint faces and connections are clean. Plug open connections to prevent contamination.
NOTE:
  • This procedure contains some variation in the illustrations depending on the vehicle specification, but the essential information is always correct.
  • This procedure contains illustrations showing certain components removed to provide extra clarity.
  1. Print illustration E164806 for use later in this procedure.
    NOTE:
    • A= dry cylinder compression test.
    • B= wet cylinder compression test.
    G11299256
  2. Refer to: Spark Plugs .
  3. Disconnect the fuel injectors.
    CAUTION: Make sure the fuel injection system is disabled before carrying out a cylinder compression test. Failure to follow this step may result in damage to the vehicle.
    NOTE: This step must be preformed to the components on both sides of the vehicle.
    G11284773
  4. Crank engine for approximately five seconds to remove any remaining fuel in the cylinders.
  5. Install the compression test gauge.
    NOTE: Dry cylinder compression test.
    G11284750

    General Equipment: Compression tester and adapters

  6. NOTE:
    • This step requires the aid of another technician.
    G11284751
    1. Crank the engine for 10 seconds, use illustration E164806 to record the figure displayed on the compression test gauge.
    2. Make sure the pressure is released from the compression test gauge after each cylinder recording.
    3. Remove the compression test gauge. Repeat the procedure for the remaining cylinders.
  7. Using a suitable syringe add 10 ml of clean engine oil into the cylinder.
    NOTE: Wet cylinder compression test.
    G11284753
  8. Install the compression test gauge.
    G11284750
  9. NOTE: This step requires the aid of another technician.
    G11284751
    1. Crank the engine for 10 seconds, use illustration E164806 to record the figure displayed on the compression test gauge.
    2. Make sure the pressure is released from the compression test gauge after each cylinder recording.
    3. Remove the compression test gauge. Repeat the procedure for the remaining cylinders.
  10. With the compression test gauge removed from the engine, crank the engine for approximately 10 seconds to remove the engine oil from the cylinder.
  11. The minimum cylinder compression reading recorded must be within 10% of the maximum cylinder compression reading recorded. If the difference across the cylinders is higher than 10% please contact dealer technical support (DTS) for further assistance.
  12. Install the spark plugs. Refer to: Spark Plugs
  13. Connect the fuel injectors.
    NOTE: This step must be preformed to the components on both sides of the vehicle.
  14. Using Jaguar approved diagnostic equipment, read and clear any diagnostic trouble codes (DTCs).
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