005423

Possible Causes

• •Cracked head
• •Faulty head gasket
• •Problem with the injector
• •Problem with the injection pump
• •Incorrect injection timing to the cylinder
• •Problem with a wrist pin
• •Scored piston
• •Hard mechanical problem
• •Leaking intake valve
• •Leaking exhaust valve

Suggested Actions

1. 1Loosen the injection line to the cylinder and listen for noise to go away (indicates injector or pump problem)
2. 2Listen for changes in noise when injection line is loosened (indicates wrist pin or scored piston)
3. 3Problem is a hard mechanical problem if noise does not change or go away when injection line is loosened
4. 4Listen for air leaking from the intake manifold (indicates leaking intake valve)
5. 5Listen for air leaking from the output of the exhaust system (indicates leaking exhaust valve)
6. 6Observe for air bubbling in the radiator or around the cylinder head (indicates cracked head or faulty head gasket)
7. 7Observe for air leaking from the test cylinder to the cylinder next to it (indicates possible faulty head gasket)

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