Cylinder Leakage Test
Cylinder Leakage Test |
Special Tools
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EN 36667-A
Leakdown Tester
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EN 36667-8
Adapter, Cylinder Leakdown Tester
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Note | ||
A leakage test may be performed to measure cylinder/combustion chamber leakage. High cylinder leakage may indicate one or more of the following: |
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Worn, burnt, or stuck valves
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Broken valve springs
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Incorrect valve lash
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Damaged valve train components
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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
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1. |
Disconnect the battery ground negative cable. Refer to
Battery Negative Cable Disconnection and Connection
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2. |
Remove the glow plugs.
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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.
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4. |
Install EN 36667-8 adapter and EN 36667 tester. |
5. |
Apply shop air pressure to
EN 36667-A
tester and adjust according to the manufacturers instructions.
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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:
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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.
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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.
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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 gasket.
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7. |
Perform the leakage test on the remaining cylinders and record the values.
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