Detroit Diesel V12-71T Engine

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• Overspeed shutdown. Overspeed shutdown
  Fix: Check governor and throttle linkages for freedom of movement. Check overspeed switch.
• Overspeed light ON, no shutdown. Overspeed light ON, no shutdown
  Fix: Disconnect wire at TB11-29. Light ON after reset; replace engine monitor board.
• Overcrank fault lamp lights and engine stops cranking after approximately 75-seconds.
  Fix: See engine service manual for troubleshooting fuel system. After correcting fault, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, depressing Reset button, then to the required running position.
• Fault lamp lights immediately after engine starts.
  Fix: Check for: Overspeed condition as engine starts.
• Fault lamp lights and engine shuts down after running for a period.
  Fix: Check the following: a. Oil level. Engine will shut down if sensor is closed. b. Check engine manual for troubleshooting oil system. c. High engine temperature. Check coolant level; check water flow (city water cooled sys
• Engine stops cranking and fault lamp lights, after cranking approximately 75 seconds.
  Fix: See engine service manual for troubleshooting fuel system. After correcting problem, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset, then back to the required running position.
• Low oil pressure shutdown. *Low oil pressure
  Fix: Check— a. Oil level. Replenish if necessary. b. Sensor. Faulty sensor will shut down engine. c. Refer to engine service manual for troubleshooting guide for oil system.
• Low oil pressure light ON. *Low oil pressure
  Fix: Disconnect wire at TB11-30. Light No shutdown. ON after relay reset. Replace engine monitor board.
• High engine temperature shutdown. *High engine temperature
  Fix: Check— a. Coolant level. Replenish if necessary. b. City water cooled sets. Check water flow, valves, etc. c. Check sensor; check thermostat. d. Radiator model, check fan belts, radiator for obstructions, etc.
• High engine temperature light ON. *High engine temperature
  Fix: Disconnect wire at TB11-31. Light No shutdown. ON after relay reset. Replace engine monitor board.
• Fault lamp lights, no fault exists.
  Fix: To check a no-fault condition, disconnect leads from TB11 terminals 29, 30 and 31. If fault lamp lights with leads disconnected, replace engine monitor board. Reconnect leads.
• Engine runs, shuts down, cranks for 75-seconds, cranking cycle stops, Overcrank light ON.
  Fix: Check fuel supply.
• Engine runs, shuts down and cranks for 75-seconds. Cranking cycle stops; fault lamp lights.
  Fix: Check fuel supply.
• *Low oil pressure shutdown. *Low oil pressure shutdown
  Cause: A. Oil level. Replenish if necessary. b. Sensor. Faulty sensor will shut down engine. c. Refer to engine service manual for troubleshooting guide for oil system.
• *Low oil pressure light ON. No shutdown. *Low oil pressure light ON
  Fix: Disconnect wire at TB11-30. Light ON after relay reset. Replace engine monitor board.

Compiled from service & troubleshooting documentation across every generator set that uses the Detroit Diesel V12-71T.