Cylinder Leakage Test
Cylinder Leakage Test |
Special Tools
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EN 35667-A
Cylinder Head Leakdown Tester
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• |
EN 39313
Spark Plug Port Adapter
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For equivalent regional tools, refer to Special Tools .
1. |
Refer to Battery Disconnect Warning . Disconnect the battery ground negative cable. |
2. |
Remove the spark plugs. Refer to
Spark Plug Replacement
.
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3. |
Rotate the crankshaft to place the piston in the cylinder being tested at top dead center (TDC) of the compression stroke. |
4. |
Thread the EN
39313
adapter into the spark plug hole.
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5. |
Install the
EN 35667-A
tester or equivalent.
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6. |
Apply shop air pressure to the EN 35667-A tester and adjust according to the manufacturers instructions. |
7. |
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:
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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.
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8. |
Perform the leakage test on the remaining cylinders and record the values.
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