DD15 Operator Guide – Running the Engine

Running the Engine

While the engine is operating, monitor the battery charge indicator light, the oil pressure, and avoid excessive idling.‪

One difference you will notice with the DD15 engine is under the hood noise. The gear train was designed for quiet operation compared to competitive engines and the camless injectors minimize noise and vibration to the point of barely hearing the engine run even at wide open throttle. ‪

Oil Pressure

Observe the oil pressure gauge immediately after starting the engine. A good indicator that all moving parts are getting lubrication is when the oil pressure gauge registers pressure 14 psi (97 kPa) at idle speed.‪

If no pressure is indicated within 10 to 15 seconds, stop the engine and check the lubrication system.‪

The pressure should not drop below 55 psi (380 kPa) at 1800 rpm, and normal operating pressure should be higher. If oil pressure does not fall within these guidelines, it should be checked with a manual gauge.‪



To avoid injury from hot oil, do not operate the engine with the rocker cover(s) removed.‪


Run the engine at part throttle for about five minutes to allow it to warm up before applying a load.‪


While the engine is idling, inspect the transmission, check for fluid leaks, and check the crankcase and turbocompound.‪


While the engine is idling, check the automatic transmission (if equipped) for proper oil level and add oil as required. ‪

Fluid Leaks

Look for coolant, fuel, or lubricating oil leaks. If any are found, shut down the engine immediately and have the leaks repaired after the engine has cooled.‪


If the engine oil was replaced, stop the engine after normal operating temperature has been reached. Allow the oil to drain back into the crankcase for about 60 minutes, then check the oil level. If necessary, add oil no more than 3.8 L (4.0 qt) at a time to bring the level to the proper mark on the dipstick. Use only the heavy-duty oils recommended. Refer to “How to Select Lubricating Oil”



Do not add oil if the oil reading is between the two bends on the dipstick or in the crosshatch area . There are approximately 3.8 L (4.0 qt) from the fill mark to the full mark. Overfilling the oil pan can cause engine damage.‪


Make a visual inspection of the turbocharger for oil leaks, exhaust leaks, excessive noise, or vibration. Stop the engine immediately if a leak or unusual noise or vibration is noted. Do not restart the engine until the cause of the concern has been investigated and corrected.

Axial Power Turbine

Check axial power turbine for excessive noise or vibration. Stop the engine immediately if unusual noise or vibration is noted. Do not restart the engine until the cause of the concern has been investigated and corrected.

Avoid Unnecessary Idling

Whenever possible, avoid unnecessary idling.‪


Do not allow the engine to idle overnight or unattended for several hours. Extensive idling will cause a buildup of hydrocarbons which can cause an uncontrolled regeneration resulting in damage to the ATD. If the California Engine Idle Limiting feature is enabled and the engine shuts down, the MCM will require recycling of the ignition system which cannot be completed on a dead or weak battery.‪

During long engine idling periods with the transmission in neutral, 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. When prolonged idling is necessary, maintain at least 900 rpm.‪

EPA07 DD15 Operator’s Guide – DDC-SVC-MAN-0003
Generated on 10-13-2008