INDICATOR-DIAL 1P2403 - Caterpillar

After starting, the engine may be held at low speed for up to 30 seconds to allow engine systems to stabilize. The duration will depend on ambient temperature, time since last run and other factors.Note: In ambient temperatures from 0° to 48°C (0° to 86.4°F), the warm-up time is approximately 3 minutes. In temperatures below 0°C (32°F), additional warm-up time may be required.When the engine idles during warm-up, observe the following conditions:Do not check the high-pressure fuel lines with the engine or the starting motor in operation. If you inspect the engine in operation, always use the proper inspection procedure to avoid a fluid penetration hazard. Refer to Operation and Maintenance Manual, "General hazard Information".
Check for fluid and air leaks at idle rpm, and at one-half full rpm (no load on the engine) before operating the engine under load. This check may not possible in some applications.
Allow the engine to idle for 3 to 5 minutes, or allow the engine to idle until the water temperature indicator begins to rise. Check all gauges during the warm-up period.Constant speed engines should be allowed to operate at low idle for 3 minutes before used at operational speed. If the low idle option is not available, then operate the engine at operational speed with no load for 2 minutes.Note: Gauge readings should be observed and the data should be recorded frequently whilst the engine is operating. Comparing the data over time will help to determine normal readings for each gauge. Comparing data over time will also help detect abnormal operating developments. Significant changes in the readings should be investigated.