GUARD AS 1632175 - Caterpillar

Recommendations for Shutdown and Start-up
The use of proper operating practices is important. The following guidelines are recommended:
For generator sets, operate the space heaters when the generator is not operating. This will help to prevent moisture damage to windings. The space heaters can be controlled with a thermostat or a relay.
A lack of proper temperature control can lead to problems with the unit injectors or other fuel system components. Operate the jacket water heaters when the engine is shut down. This will help to maintain proper temperatures for start-up in the cylinder heads, cylinder liners, and fuel system components. Maintain the jacket water temperature to a minimum of 65 °C (149 °F).
Follow the recommended procedures before starting any engine. Incomplete procedures can lead to system malfunctions that do not allow engine operation. See this Operation and Maintenance Manual, "Engine Starting" topic (Operation Section).
Prior to starting any engine after an overhaul or after servicing the fuel system, ensure that all of the engine protective devices will function. Prepare to use the emergency stop button, if necessary.
Test the engine with distillate fuel after an overhaul or after servicing the fuel system. Perform the test before changing to heavy fuel. If an unexpected problem occurs, distillate fuel is easier to clean up. For example, if a leak develops after starting, cleaning up heavy fuel oil would be more difficult than cleaning up distillate fuel.Fuel Bypass Valve
During normal operation, the valves for the fuel supply lines and the fuel return lines are open. The bypass valve between the supply lines and return lines is closed. When the fuel supply lines and the fuel return lines are closed, fuel does not flow to the fuel filters. The filters will cool. Hours may be required for heating the fuel filters before starting the engine. When the fuel to an engine is changed, the bypass valve must be adjusted in order to maintain the correct fuel system pressure. Adjustment of the bypass valve also maintains the circulation of fuel through the fuel system when the fuel supply and return lines are closed.For sites with more than one engine sharing one