PISTON 3240497 - Caterpillar

Stopping the engine immediately after the engine has been operating under a load can result in overheating and accelerated wear of the engine components.Allow the engine to gradually cool before stopping the engine.
There may be several different methods of stopping the engine. Be sure that the engine stopping procedure is understood. Follow the instructions that are provided by the OEM of the control panel.
Reduce the load to zero. Note: Remove the load at a rate that will avoid detonation. Reduce the load from 100 percent to zero percent within three minutes but not less than two minutes.
For generator set applications, open the main circuit breaker. Note: Extended idling can cause excessive oil consumption and related problems.
Stop the engine according to the instructions that are provided by the OEM of the control panel. If the cooldown feature is utilized, the engine will operate for a programmed period of time before the engine stops. This allows the turbochargers to slow down. After the cooldown, the engine will shut off.If the cooldown feature is not utilized, operate the engine at high idle rpm for a cooldown period before stopping the engine. If the engine has been operated at a high load, operate the engine at high idle until the engine systems stabilize. For example, wait until the speed of the turbochargers is reduced. Under normal operating conditions, the cooldown period should be less one minute.