KIT-SEAL- 2440959 - Caterpillar

Introduction
A leakage test may be performed to measure cylinder/combustion chamber leakage.Probable Causes
High cylinder leakage may indicate one or more of the following:
Worn or burnt valves
Broken valve springs
Stuck valve lifters
Incorrect valve lash
Damaged piston
Worn piston rings
Worn or scored cylinder bore
Damaged cylinder head gasket
Cracked or damaged cylinder head
Cracked or damaged engine blockRequired Tools
Cylinder head leakdown testerTest Procedure
Disconnect the battery ground negative cable.
Remove the spark plugs from the engine.
Rotate the crankshaft so that the piston being tested is at Top Dead Center (TDC) of the compression stroke.
Install the cylinder leak down tester.Note: If necessary, hold the crankshaft balancer bolt to prevent the crankshaft from rotating.
Apply shop air pressure to the cylinder leak down tester and adjust according to the manufacturer instructions.
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:
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.
Air leakage sounds at the exhaust system tailpipe that 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 that 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.
Perform the leakage test on the remaining cylinders and record the values.