MODULE GP-SPEED/TACH ELEK 1440890 - Caterpillar

a borescope to inspect the cylinders. The inspection will provide information about the internal condition of the engine.A borescope with a lens that can be rotated is recommended. This type of borescope provides a clear view of the combustion chamber and of the bottom deck of the cylinder head. Photographic documentation or video documentation is also recommended. Consult your Caterpillar dealer for information on available borescopes.To perform this procedure, insert the borescope through the cylinder head bores for the fuel injectors. Use the borescope to look for the following conditions:
Valve wear
Deposits on the valve face
Valve seat wear
Deposits on the valve seat
Polishing of the cylinder walls
Scratching of the cylinder walls
Deposits on the cylinder walls that are above the upper limit of the piston stroke
Indications of adequate spray patterns (fuel injector) on the piston crownsDeposits that are on the valve face and the valve seat can cause guttering of the valve face. Inspect the valve seat and the valve face for excessive deposits. If excessive deposits are found, clean the valve and the valve seat or replace the components. Clean the combustion chamber, if necessary.For information on replacing the components, see the Service Manual. Consult your Caterpillar dealer for assistance.