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Cylinder Leakage Test

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools

For equivalent regional tools, refer to Special Tools 

  1. GM2706244Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    Refer to Battery Disconnect Warning .

    NOTE:

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

    • Worn, burnt, or stuck valves
    • Broken valve springs
    • Incorrect valve lash
    • Damaged valve train components
    • Damaged piston
    • Worn piston rings
    • Worn or scored cylinder bore
    • Damaged cylinder head gasket
    • Cracked or damaged cylinder head
    • Cracked or damaged engine block

    Disconnect the battery ground negative cable.

  2. Remove the fuel injectors.
  3. Rotate the crankshaft to place the piston in the cylinder being tested at Top Dead Center (TDC) of the compression stroke.
  4. Install EN-51110  adapter and EN-35667-A  tester.
    5. NOTE:

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

  5. Apply shop air pressure to EN-35667-A  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 sounds at the intake manifold tube, may indicate a worn, stuck or burnt intake valve, broken valve spring, incorrect valve lash or damaged valve train components.
    • Air leakage sounds at the exhaust system tailpipe may indicate a worn, burnt, or stuck exhaust valve, broken valve spring, incorrect valve lash or damaged valve train components.
    • Air leakage sounds from the crankcase, oil level indicator tube, or oil fill tube 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 gasket.
  7. Perform the leakage test on the remaining cylinders and record the values.
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