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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
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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.

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.