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Cummins/Onan QSJ5.9G-G1 Engine Engine

Name: Cummins/Onan QSJ5.9G-G1 Engine
Brand: Cummins/Onan

The Cummins/Onan QSJ5.9G-G1 is a 6 L 6-cylinder naturally aspirated engine. It powers generator sets from Cummins/Onan, including the C50 N6.

Also known as: Cummins Inc. QSJ5.9G-G1

Part of the Cummins/Onan QSJ5.9G engine family — 4 variants share parts & fitment.

6.0 L

Displacement

Cylinders

Unknown Shutdown at Idle 5134
Field Overload (Shutdown) 2972
Fault Code on Secondary Source (Information that the Fueling Has Been Shifted to Secondary Source) 5365
Engine Combustion (Shutdown) 5669
Cold Start Idle Active (Event) 6518
- Oil pressure sensor output out of range low Code 141
- Engine oil pressure low (warning) Code 143
- Engine coolant temperature out of range low (warning) Code 144

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QSJ5.9G-G1.

Part #	Description	Category
3824510	Belt tension gauge, click type (v-belts‘and v-ribbed with 4 or 5 ribs)	other_service
A047A982	EControls GCP E-Com USB interface cable	other_service
A026M166	Accessory seal kit	seal
B180313494	Onan C50N6 March Inspection	service_type

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

What is the displacement of the Cummins/Onan QSJ5.9G-G1?

The Cummins/Onan QSJ5.9G-G1 has a displacement of 6.0 liters with 6 cylinders.

Which generators use the Cummins/Onan QSJ5.9G-G1 engine?

The Cummins/Onan QSJ5.9G-G1 powers 1 generator set(s), including Cummins/Onan C50 N6.

What is a common problem with the Cummins/Onan QSJ5.9G-G1 engine?

A commonly reported issue on generators using the Cummins/Onan QSJ5.9G-G1 is: Unknown Shutdown at Idle.