J 35667-A Cylinder Head Leakdown Tester
Warning: Refer to Battery Disconnect Warning in the Preface section.
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 or burnt valves • Broken valve springs • Stuck valve lash adjuster • Damaged piston • Worn piston rings • Worn or scored cylinder bore • Damaged cylinder head gasket • Cracked or damaged cylinder head • Cracked or damaged engine block
Note: It may be necessary to hold the crankshaft balancer bolt to prevent the engine from rotating.
• | Air leakage sounds at the throttle control module or air inlet hose may indicate a worn or burnt intake valve or a broken valve spring. |
• | Air leakage sounds at the exhaust system tailpipe may indicate a worn or burnt exhaust valve or a broken valve spring. |
• | 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 a damaged cylinder head gasket. |