Cavalier L4-2.2L VIN F (2004)
Compression Check: Testing and Inspection
Cylinder Leakage Test
Cylinder Leakage Test
Tools Required
J 35667-A Cylinder Head Leakdown Tester or equivalent
Important: A leakage test may be performed in order to measure cylinder/combustion chamber leakage. High leakage may indicate one or more of
the following:
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Worn or burnt valves
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Broken valve springs
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Stuck valve lifters
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Incorrect valve lash/adjustment
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Damaged piston
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Worn piston rings
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Worn or scored cylinder bore
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Damaged cylinder head gasket
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Cracked or damaged cylinder head
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Cracked or damaged engine block
Caution: Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be
OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical
terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the
vehicle or its components.
1. Disconnect the battery ground negative cable.
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 J 35667-A or equivalent
Important: It may be necessary to hold the crankshaft balancer bolt to prevent the engine from rotating.
5. Apply shop air pressure to the J 35667-A and adjust according to the manufacturers instructions.
6. Record the cylinder leakage value. Cylinder leakage that exceeds 25 percent in considered excessive and may require component service. In
excessive leakage situations, inspect for the following conditions:
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Air leakage sounds at the throttle body or air inlet hose that may indicate a worn or burnt intake valve or a broken valve spring.
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Air leakage sounds at the exhaust system tailpipe that may indicate a worn or burnt exhaust valve or a broken valve spring.
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Air leakage sounds 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.
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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.
