WASHER 3237246 - 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.
Note: Remove the load at a rate that will avoid detonation.
Disengage the driven equipment.
For generator set engines, open the main circuit breaker.
For industrial engines, unload the compressor or pump. Disengage the clutch (if equipped). Place the transmission and/or other attachments for the power take-off in NEUTRAL. Note: Extended idling can cause excessive oil consumption and related problems. See this Operation and Maintenance Manual, "Engine Operation" topic (Operation Section).
Reduce the engine rpm to low idle.
Operate the engine at low idle rpm for a cool down period. If the engine has been operated at a low load, operate the engine at low idle for approximately 30 seconds before stopping the engine.If the engine has been operated at a high load, operate the engine at low idle for three to five minutes before stopping the engine.
To stop the engine, shut off the fuel supply. The engine will coast to a stop. Ensure that any system that provides external support to the engine is secured after the engine is stopped.