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Home›Engines›Cummins/Onan Modified Ford In-line 6 CSG-649

Cummins/Onan Modified Ford In-line 6 CSG-649 Engine

The Cummins/Onan Modified Ford In-line 6 CSG-649 is an engine. It powers generator sets from Cummins/Onan, including the GGFB and GGFC. It holds 7 L (1.8 gal) of oil.

Also known as: Onan Modified Ford In-line 6 CSG-649

7.0 L
Oil capacity
On this pageSpecsGenerator setsMaintenanceFAQTorque & specsProcedures

Engine specifications

Oil capacity7.0 L

Generator sets powered by this engine

2
Cummins/Onan GGFBCummins/Onan GGFC

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

Common problems

11
  • OUTPUT TO TIME DELAY START/STOP MODULE A15, FUSED AT 15 AMPS, AVAILABLE WHEN THE STARTING BATTERIES ARE CONNECTED TB1-7
  • OUTPUT TO RELAY K12, FUSED AT 20 AMPS, ENERGIZED WHEN THE START SIGNAL IS APPLIED AND DE-ENERGIZED AT SHUTDOWN (NORMAL AND FAULT) TB1-10
  • OUTPUT TO RELAY K11, FUSED AT 20 AMPS TB1-8
  • MOMENTARY CONTACT TO GROUND TB2-16
  • GROUND OUTPUT TO LIGHT/RELAY* TB2-2
  • GROUND INPUT FROM SENDER TB2-1
  • GROUND TB1-5
  • CONNECTED TO TIME DELAY START/STOP MODULE A15. CONNECT REMOTE START CONTACT OF THE AUTOMATIC TRANSFER SWITCH TO TERMINAL TB1-5 OF MODULE A15. TB1-6
  • CONNECTED TO TIME DELAY START/STOP MODULE A15 TB1-3
  • COMMON ALARM B+ OUTPUT 4 AMP RATED DEVICE MAXIMUM TB1-4
  • B+ INPUT TB1-9

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan Modified Ford In-line 6 CSG-649.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter—
Fuel filter—
Oil filter—
Battery—
Belt—
Coolant—
Coolant filter—
Oil—
Spark plug—

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

Service specifications

5
TypeItemValueUnitCondition
PressureOil pressure55all load bank stages
SpeedFrequency60Hzall load bank stages
TemperatureAmbient temperature75°Fload bank test
TemperatureCoolant temperature180°F15 min / 30 min / 45 min load stages
VoltageDC voltage14Vall load bank stages after warm-up

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

1
Generator Check list maintenance
  1. Check coolant level and record freeze protection.
  2. Visually inspect radiator for cleanliness and leaks.
  3. Visually inspect radiator hoses.
  4. Check condition of coolant hoses.
  5. Check condition of fuel hoses.
  6. Check condition of engine belts.
  7. Check batteries and quantity.
  8. Check battery install date and battery charger.
  9. Check genset coolant heater.
  10. Check engine oil level.
  11. Check engine oil filter change date and hours.
  12. Inspect exhaust system for cracks and leaks.
  13. Check rain cap for proper operation.
  14. Verify generator end is 12 lead reconnectable.
  15. Verify generator end has PMG permanent magnet generator.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

What is the oil capacity of the Cummins/Onan Modified Ford In-line 6 CSG-649?

The Cummins/Onan Modified Ford In-line 6 CSG-649 engine has an oil capacity of 7.0 liters.

Which generators use the Cummins/Onan Modified Ford In-line 6 CSG-649 engine?

The Cummins/Onan Modified Ford In-line 6 CSG-649 powers 2 generator set(s), including Cummins/Onan GGFB, Cummins/Onan GGFC.

What is a common problem with the Cummins/Onan Modified Ford In-line 6 CSG-649 engine?

A commonly reported issue on generators using the Cummins/Onan Modified Ford In-line 6 CSG-649 is: OUTPUT TO TIME DELAY START/STOP MODULE A15, FUSED AT 15 AMPS, AVAILABLE WHEN THE STARTING BATTERIES ARE CONNECTED.