BEARING 9W4162 - Caterpillar

Ignition systems can cause electrical shocks. Avoid contacting the ignition system components and wiring during operation.
Maintenance of the spark plugs is required in order to achieve the following benefits:
Normal fuel consumption
Normal level of emissions
Maximum service life of the spark plugsThe service life of the spark plugs is affected by fouling due to deposits from the oil and by peak voltage. Maintenance of the ignition system is also affected by voltage. Higher voltage is required by higher inlet manifold air pressure and a higher compression ratio. Higher voltage reduces the service life of components such as spark plugs, wires, and transformers.Remove the Spark Plug
Pulling on the wiring harness may break the wires. Do not pull on the wiring harness.
Standard Ignition System
Illustration 1 g00842026
Standard ignition system
(1) Cover
(2) Spark plug
Remove cover (1). Ignition Systems With Integral Transformers
Illustration 2 g00842035
Ignition system with integral transformers
(1) Connector
(2) Clamp
(3) Boot
(4) Transformer
(5) Gasket
Loosen connector (1).
Loosen clamp (2).
Remove boot (3).
Unscrew transformer (4).
Remove gasket (5). Discard the gasket. Removing the Spark Plug
Pressurized air can cause personal injury. When pressurized air is used for cleaning, wear a protective face shield, protective clothing, and protective shoes.
Debris may have collected in the spark plug well. Thoroughly remove any debris. Use compressed air. The maximum air pressure for cleaning purposes must be below 207 kPa (30 psi). Ensure that the area around the spark plug is clean and free of dirt and debris.
To loosen the spark plug, use a 2P-5481 Deep Well Socket. After the spark plug has been loosened, remove the spark plug by hand in order to detect problems with the threads. After the spark plug has been removed, discard the used spark plug gasket.
The use of a thread tap will remove metal unnecessarily. This will also reduce the heat transfer for the spark plug. This can result in a reduction of the spark plug service life and a reduction of the detonation margin.
If the spark plug resists removal by hand, apply penetrating oil to the threads. Use the wrench and apply steady pressure to the spark plug until the spark plug is loose.If the spark plug can not be removed by hand, clean the threads with a 154-9521 Spark Plug Seat Cleaner. This tool scrapes debris from the seat and from the threads in the cylinder head.Inspecting the Spark Plug
Illustration 3 g00842036
(1) Terminal post
(2) Insulator
(3) Shell
(4) Gasket
(5) Electrode and ground straps Inspect the spark plug closely for damage. The condition of the spark plug can indicate the operating condition of the engine.Terminal post (1) must not move. If the terminal post can be moved by hand, discard the spark plug. Inspect insulator (2) for cracks. If a crack is found, discard the spark plug.Faint marks may extend from shell (3) onto the insulator. The marks may be a result of corona that forms at the top of the shell. The conductor will develop a corona when a very high voltage ionizes the air. This is a normal condition. This is not an indication of leakage between the shell and the