Cummins/Onan DJC Engine Engine

• Worn or sticking piston rings EXCESSIVE OIL CONSUMPTION, LIGHT BLUE SMOKY EXHAUST
  Fix: Check compression. Clean or replace ring: a
• Worn oil pump Low Oi PRESSURE
  Fix: Replace pump
• Worn bearings Low Oi PRESSURE
  Fix: Rebuild engine
• VOLTAGE DROPS UNDER HEAVY LOAD
  Cause: Engine lacks power, Poor compression, Faulty injection, Dirty air cleaner, Restricted exhaust line
  Fix: See remedies for engine misfires, Tighten cylinder head and glow plug. If still not corrected, grind the valves. Replace piston rings, if necessary., Check the fuel system. Clean, adjust or replace parts necessary, Clean
• Unusual noises, loss of power, etc.
  Fix: Contact your ONAN dealer.
• Unusual noises, loss of power
  Fix: Contact your Onan dealer
• TAPPING SOUND
  Cause: Valve clearance too great, Broken valve spring
  Fix: Adjust. Replace faulty valve system, Install new spring
• Sticking compression ring
  Fix: Replace
• SHARP METALLIC THUD, ESPECIALLY WHEN COLD ENGINE FIRST STARTED
  Cause: Low oil supply, Oil badly diluted
  Fix: Add oil, Change oil
• Overheating
  Cause: Dirty cooling surfaces, operating without the engine air housing, poor air circulation, improper lubrication, wrong injection timing and engine overload
• Oil too heavy LOW OIL CONSUMPTION
  Fix: Replace with lighter oil
• OIL SYSTEM
  Cause: [Diluted oil due to leaky fuel transfer pump diaphragm. Faulty cylinder oil control.
  Fix: Rebuild or replace pump if diaphragm is leaking. Inspect rings and cylinder walls for issues related to faulty cylinder oil control.
• Oil supply low Low Oi PRESSURE
  Fix: Check cause: of oil consumption. Governor incorrectly adjusted.
• Oil by-pass stuck open Low Oi PRESSURE
  Fix: Clean by-pass valve
• LOW OIL PRESSURE
  Cause: Defective gage, Oil too light or diluted from leaking fuel pump diaphragm, Oil too low, Oil relief valve not seating, Badly worn bearings, Sludge on oil cup screen, Badly worn oil pump
  Fix: Replace, Drain. Refill with proper oil. Repair or replace transfer pump, Add oil, Clean. Replace if needed, Clean screen and oil sump, Replace

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan DJC.

• Removal:
• Service Procedure
• REMOVAL AND DISASSEMBLY, STARTING MOTOR

Step-by-step procedures compiled from the Cummins/Onan service manual for this engine.