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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Mechanical - 3.4L) >> Diagnostic Information and Procedures >> Cylinder Leakage Test >> Testing Procedure >> Tools Required

Tools Required

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J 35667-A  Cylinder Head Leakdown Tester. See Special Tools .

With the use of air pressure, a cylinder leakage test will aid in the diagnosis. Use the cylinder leakage test in conjunction with the engine compression test in order to isolate the cause of leaking cylinders.

    CAUTION: Refer to Battery Disconnect Caution .
  1. Disconnect the negative battery cable.
  2. Remove the spark plugs. Refer to Spark Plug Replacement .
  3. Install the J 35667-A  . See Special Tools .
  4. Measure each cylinder on the compression stroke, with both valves closed.
    5. IMPORTANT: Hold the crankshaft balancer bolt in order to prevent piston movement.
  5. Apply air pressure, using the J 35667-A  . See Special Tools . Refer to the manufacturer's instructions.
  6. Record the cylinder leakage readings for each cylinder.
    7. IMPORTANT:
    • Normal cylinder leakage is from 12 to 18 percent.
    • Make a note of any cylinder with more leakage than the other cylinders.
    • Any cylinder with 30 percent leakage or more requires service.
  7. Inspect the 4 primary areas in order to properly diagnose a leaking cylinder.
  8. If air is heard from the intake or exhaust system, perform the following procedure:
    • Remove the valve rocker arm cover of the suspect cylinder head.
      • Ensure that both valves are closed.
      • Inspect the cylinder head for a broken valve spring.
    • Remove and inspect the suspect cylinder head. Refer to Cylinder Head Cleaning and Inspection .
  9. If air is heard from the crankcase system at the crankcase oil filler tube, perform the following procedure:
    1. Remove the piston from the suspect cylinder.
    2. Inspect the piston and connecting rod assembly. Refer to Piston, Connecting Rod, and Bearing Cleaning and Inspection .
    3. Inspect the engine block. Refer to Engine Block Cleaning and Inspection .
  10. If bubbles are found in the radiator, perform the following procedure:
  11. Remove the J 35667-A  . See Special Tools .
  12. Install the spark plugs. Refer to Spark Plug Replacement .
    13. CAUTION: Refer to Battery Disconnect Caution .
  13. Connect the negative battery cable.
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