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Cummins/Onan VT1710-P635 Engine

The Cummins/Onan VT1710-P635 is a 27.84 L 12-cylinder engine rated at 1800 rpm, producing up to 409.48 kW. It powers generator sets from Cummins/Onan, including the DFU Series. It holds 21 L (5.5 gal) of oil and 35 L (9.2 gal) of coolant.

Also known as: Cummins VT1710-P635

27.84 L
Displacement
12
Cylinders
1800 rpm
Rated speed
409 kW
Gross power
On this pageSpecsGenerator setsMaintenanceFAQ

Engine specifications

Oil capacity21.0 L
Coolant capacity35.0 L
Displacement27.84 L
Cylinders12
Rated speed1800 rpm
Gross power409 kW

Generator sets powered by this engine

1
Cummins/Onan DFU Series

How to read your Cummins/Onan engine serial & model number →

Common problems

11
  • When pressing test lamp button - one or more fault lamps do not light.
    Fix: Fault lamp/lamps burned out - replace.
  • Overspeed lamp lights - no fault condition exists.
    Fix: Replace overspeed circuit board.
  • Overcrank fault lamp lights and engine stops cranking after - approximately 75 seconds.
    Fix: See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting problem, reset the engine monitor by moving run-stop-remote switch to stop position, and depressing reset switch. PENN STATE: Move and hold run-stop-remote switch to OFF. Press reset, release and move switch to ON.
  • Overcrank fault lamp lights after engine has run for approximately 75 seconds.
    Fix: Replace start-disconnect circuit board.
  • Low oil pressure lamp lights after engine is running.
    Fix: Check: a. Oil level - engine will shut down after approximately 12-1/2 seconds if oil pressure is low.
  • Low oil pressure fault lamp lights - no fault condition exists.
    Fix: Be certain that no fault condition exists. Disconnect lead 30 from TBIl inside control box (refer to wiring diagram). If low oil pressure lamp still lights, remove and replace engine monitor plug-in printed circuit board.
  • High engine temperature lamp lights as soon as engine starts.
    Fix: Check for defective sensor or high temperature condition.
  • High engine temperature lamp lights after engine is running.
    Fix: Check for: a. High temperature condition. b. See engine service manual. c. Defective high engine temperature sensor.
  • High engine temperature fault lamp lights - no fault condition exists.
    Fix: Be certain that no fault condition exists. Remove lead 31 from TB11 inside control box (refer to wiring diagram). If high engine temperature lamp still lights, remove and replace engine monitor plug-in printed circuit board.
  • Fault lamp lights immediately after engine starts.
    Fix: Check for: a. overspeed condition as engine starts. b. high temperature condition. c. faulty high engine temperature sensor or overspeed switch
  • Fault lamp lights and engine stops cranking after approximately 75 seconds.
    Fix: See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting problem, reset the engine monitor by holding run-stop-remote switch in stop position, and depressing reset switch. Release and return to run position.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan VT1710-P635.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filterservice frequently—
Fuel filterfilter or strain fuel when filling tank—
Oil filter—1000 hr
Batteryservice as necessary, connect in series for normal installation—
Belt—1000 hr
Coolantfill before starting, check level several times and replenish if necessary42.0 gallons—
Oildrained prior to shipment, fill to capacities shown18.0 gallons—
Spark plug—

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Common questions

What is the oil capacity of the Cummins/Onan VT1710-P635?

The Cummins/Onan VT1710-P635 engine has an oil capacity of 21.0 liters.

What is the displacement of the Cummins/Onan VT1710-P635?

The Cummins/Onan VT1710-P635 has a displacement of 27.84 liters with 12 cylinders.

Which generators use the Cummins/Onan VT1710-P635 engine?

The Cummins/Onan VT1710-P635 powers 1 generator set(s), including Cummins/Onan DFU Series.

What is a common problem with the Cummins/Onan VT1710-P635 engine?

A commonly reported issue on generators using the Cummins/Onan VT1710-P635 is: When pressing test lamp button - one or more fault lamps do not light.. Fix: Fault lamp/lamps burned out - replace..