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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Cylinder Leakage Test >> Special Tools

Special Tools

EN-35667-A  Cylinder Head Leakdown Tester

Equivalent regional tools: Special Tools

NOTE:

A leakage test may be performed in order to measure cylinder/combustion chamber leakage. High cylinder leakage may indicate one or more of the following conditions:

  • Worn or burnt valves
  • Broken valve springs
  • Stuck valve lifters
  • Incorrect valve lash
  • Damaged piston
  • Worn piston rings
  • Worn or scored cylinder bore
  • Damaged cylinder head gasket
  • Cracked or damaged cylinder head
  • Cracked or damaged engine block
    WARNING:

    Refer to Battery Disconnect Warning .

  1. Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection (9C1/5W4)Battery Negative Cable Disconnection and Connection (KL9)
  2. Remove the spark plugs:
  3. Rotate the crankshaft to place the piston in the cylinder being tested at top dead center (TDC) of the compression stroke.
  4. Install the EN-35667-A  Cylinder Head Leakdown Tester, or equivalent.
    5. NOTE:

    It may be necessary to hold the crankshaft balancer bolt to prevent the crankshaft from rotating.

  5. Apply shop air pressure to the EN-35667-A  Cylinder Head Leakdown Tester and adjust according to the manufacturers instructions.
  6. Record the cylinder leakage value. Cylinder leakage that exceeds 25 percent is considered excessive and may require component service. In excessive leakage situations, inspect for the following conditions:
    • Air leakage noise at the throttle body or air inlet hose that may indicate a worn or burnt intake valve or a broken valve spring.
    • Air leakage noise at the exhaust system tailpipe that may indicate a worn or burnt exhaust valve or a broken valve spring.
    • Air leakage noise from the crankcase, oil level indicator tube, or oil fill tube that may indicate worn piston rings, a damaged piston, a worn or scored cylinder bore, a damaged engine block or a damaged cylinder head.
    • Air bubbles in the cooling system may indicate a damaged cylinder head or a damaged cylinder head gasket.
  7. Perform the leakage test on the remaining cylinders and record the values.
  8. Install the spark plugs:
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