KIT-GASKET 3891339 - Caterpillar

More frequent inspection and replacement of the starting motor may be required for the following conditions:
Operation in harsh environments
Applications that require frequent stops and startsIf the starting motor fails, the engine may not start in an emergency situation. A scheduled inspection of the starting motor is recommended.The starting motor pinion and the flywheel ring gear must be in good condition in order for the engine to start properly. The engine will not start if the starting motor pinion does not engage the flywheel ring gear. The teeth of the starting motor pinion and the flywheel ring gear can be damaged because of irregular engagement.Inspect the starting motor for proper operation. Listen for grinding when the engine is started. Inspect the teeth of the starting motor pinion and the flywheel ring gear. Look for patterns of wear on the teeth. Look for teeth that are broken or chipped. If damaged teeth are found, the starting motor pinion and the flywheel ring gear must be replaced. If damaged teeth are found, the air circuit for the starting motor must be examined in order to determine the cause of the problem.
Personal injury or death can result from improperly checking for a leak.Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing serious injury, and possible death.If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.
Inspect all of the components in the air circuit for the starting motor. Inspect all of the air lines and connections for leaks. If repairs are needed, see the Service Manual or consult your Caterpillar dealer.