Idling the Engine
The common belief that idling a diesel engine causes no engine damage is wrong.
Idling produces sulfuric acid, which is absorbed by the lubricating oil and eats into
bearings, rings, valve stems and engine surfaces. During long engine idling periods,
the engine coolant temperature may fall below the normal operating range. The
incomplete combustion of fuel in a cold engine will cause crankcase oil dilution,
formation of lacquer or gummy deposits on the valves, pistons, and rings, and rapid
accumulation of sludge in the engine. If the operator must idle the engine for cab
heat or cooling, the high idle function of the cruise control switches should be used.
For more information on high idle using the cruise control switches, Refer to
section "Detroit Diesel Electronic Control System Features". An idle speed of 900
rpm should be enough to provide cab heat in above 0°C (32°F) temperatures. Never
allow the engine to idle for more than 30 minutes. When prolonged idling is
necessary, maintain an engine speed of 900 rpm.
Running the Engine
While the engine is operating, monitor the battery charge indicator and the oil
pressure. Unnecessary idling should be avoided whenever possible.
Checking the Oil Pressure
Monitor the oil pressure as follows:
1. Observe the oil pressure gauge immediately after starting the engine. An oil
pressure that registers withing the normal operating range is a good indicator
that all moving parts are getting lubrication.
2. If no pressure is indicated within 10 to 15 seconds, stop the engine and check
the lubrication system at normal operating temperature.
3. The oil pressure should not drop below the normal operating range, at normal
operating temperature. If oil pressure falls outside the normal operating range
or if an oil pressure indicator becomes active, immediately contact an
authorized Detroit™ service outlet for further instructions.
Warming up the Engine
Run the engine at part throttle for about five minutes to allow it to warm up before
applying a load.
Checking the Transmission
While the engine is idling, check the automatic transmission (if equipped) for
proper oil level and add oil as required. For additional information on checking the
transmission, Refer to the Original Equipment Manufacturer (OEM) literature and
the Transmission Fluid Service brochure DDC-SVC-BRO-0118.
Gen 5 DD Platform Operators Manual
All information subject to change without notice. 27
DDC-SVC-MAN-0217 Copyright © 2020 DETROIT DIESEL CORPORATION
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