Detroit Diesel V12-71T Engine
The Detroit Diesel V12-71T is a 13.96 L 12-cylinder turbocharged engine rated at 1800 rpm, producing up to 428.9 kW. It powers generator sets from Cummins/Onan, including the DHA Series and DHB 350.0. It holds 34.1 L (9.0 gal) of oil and 52 L (13.7 gal) of coolant.
Also known as: Detroit Diesel V12-71T
Engine specifications
| Oil capacity | 34.1 L |
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| Coolant capacity | 52.0 L |
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| Displacement | 13.96 L |
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| Cylinders | 12 |
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| Aspiration | Turbocharged |
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| Rated speed | 1800 rpm |
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| Gross power | 428 kW |
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Common problems
15- Fault lamp lights and engine shuts down after running for a period
Cause: Oil level (engine will shut down if sensor is closed)
Fix: Check oil level - Low oil pressure shutdown
Cause: Oil level
Fix: Check oil level; replenish if necessary - High engine temperature shutdown
Cause: Coolant level
Fix: Check coolant level; replenish if necessary - Overspeed shutdown. Overspeed shutdown
Fix: Check governor and throttle linkages for freedom of movement. Check overspeed switch. - 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, 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 - Fault lamp lights immediately after engine starts
Cause: Overspeed condition as engine starts
Fix: Check for overspeed condition as engine starts - 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 - 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 - 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. - Overspeed light ON, no shutdown
Fix: Disconnect wire at TB11-29; light ON after reset, replace engine monitor board - 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.
Compiled from service & troubleshooting documentation across every generator set that uses the Detroit Diesel V12-71T.
Common questions
What is the oil capacity of the Detroit Diesel V12-71T?
The Detroit Diesel V12-71T engine has an oil capacity of 34.1 liters.
What is the displacement of the Detroit Diesel V12-71T?
The Detroit Diesel V12-71T has a displacement of 13.96 liters with 12 cylinders.
Which generators use the Detroit Diesel V12-71T engine?
The Detroit Diesel V12-71T powers 2 generator set(s), including Cummins/Onan DHA Series, Cummins/Onan DHB 350.0.
What is a common problem with the Detroit Diesel V12-71T engine?
A commonly reported issue on generators using the Detroit Diesel V12-71T is: Fault lamp lights and engine shuts down after running for a period. Cause: Oil level (engine will shut down if sensor is closed). Fix: Check oil level.