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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 221 (Engine Controls - Basic Diagnostic Procedures - 6.6L Diesel) >> Preliminary Inspection & Adjustments >> Mechanical Inspection >> Cylinder Combustion Pressure Leakage

Cylinder Combustion Pressure Leakage

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  1. Disconnect battery negative terminal. Remove glow plugs. Rotate crankshaft to place piston in the cylinder being tested at Top Dead Center (TDC) of compression stroke. Install Cylinder Head Leakdown Adapter (J-35667-9) and Cylinder Head Leakdown Tester (J-35667-A).
    2. NOTE: Hold crankshaft balancer bolt in order to prevent piston movement.
  2. Apply air pressure to cylinder leakdown tester. Record cylinder leakage readings for each cylinder. Any cylinder with 25 percent leakage or more requires service.
  3. Inspect following primary areas in order to properly diagnose a leaking cylinder.
    • 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, gasket, or leaking injector tube.
  4. After performing test, remove leakdown tester. Install spark plugs and reconnect negative battery terminal.
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