HomeEnginesCummins/Onan 6BT5.9-G6

Cummins/Onan 6BT5.9-G6 Engine Engine

The Cummins/Onan 6BT5.9-G6 is a 5.9 L 6-cylinder turbocharged engine rated at 1800 rpm, producing up to 126.8 kW. It powers generator sets from Cummins/Onan, including the C110D6, C120D5 and DGDB. It holds 16.4 L (4.3 gal) of oil and 24.6 L (6.5 gal) of coolant.

Also known as: Cummins 6BT5.9-G6

Part of the Cummins/Onan 6BT5.9 engine family — 6 variants share parts & fitment.

5.9 L
Displacement
6
Cylinders
1800 rpm
Rated speed
126 kW
Gross power

Engine specifications

Oil capacity16.4 L
Coolant capacity24.6 L
Displacement5.9 L
Cylinders6
AspirationTurbocharged
Rated speed1800 rpm
Gross power126 kW

Generator sets powered by this engine

3

Parts cataloged across the Cummins/Onan 6BT5.9 family

36
Part #DescriptionCategory
982-0200Air Filterair_filter
3824469fuel pump gear pullerfuel_pump
DM-3801372Gasket Set - 6BT 5.9gasket
FP-6B59PREM6B/6BT5.9 In-Frame Kit w/upper gasket set & oil pan gasketgasket
FP-6B59PREML6B/6BT5.9 In-Frame Kit w/upper gasket set & oil pan gasket (late)gasket
FP-IFK6B59PREM6B/6BT5.9 In-Frame Kit w/upper gasket set & oil pan gasketgasket
FP-IFK6B59PREML6B/6BT5.9 In-Frame Kit w/upper gasket set & oil pan gasket (late)gasket
3822509injector pullerinjector
3823276injector bore brushinjector
DM-3029551Fuel Injector - 6BT 5.9injector
LF3349Lube, Full-Flow Spin-Onlube_filter
3377259bosch timing tool (ve)other_service
960-0627Cother_service
965-0520Cooling Fanother_service
DM-3802010Main Bearing Set Standard - 4BT 3.9, 6BT 5.9, 6CT 8.3other_service
FP-33569706B/6BT5.9 In-Frame Kit (contains FP-3802160 Piston Kit)other_service
FP-33569716B/6BT5.9 In-Frame Kit (contains FP-3802248 Piston Kit)other_service
GM12641Safety/locking agentother_service
GM12657Dipstickother_service
GM12676Cylinder linerother_service
GM12678Screw plugother_service
GM12697Torx-head boltother_service
GM12921Hexagon boltother_service
GM12924Rear end coverother_service
GM12936Wrapped bearing bushother_service
GM12937Wrapped bearing bushother_service
GM12954Dipstickother_service
GM12970Compression springother_service
GM13175Pipe clampother_service
S103selector switch on the control PCBother_service
TB1-6terminals between TB1-5 and TB1-7 in the control boxother_service
TB1-7terminals between TB1-6 and TB1-8 in the control boxother_service
DM-3805401Oil Pump - 6BT 5.9pump
DM-3805403Water Pump - 4BT 3.9, 6BT 5.9pump
GM12667Sealing ringseal
DM-3015282Thermostat 180F - 4BT 3.9, 6BT 5.9thermostat

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

Common questions

What is the oil capacity of the Cummins/Onan 6BT5.9-G6?

The Cummins/Onan 6BT5.9-G6 engine has an oil capacity of 16.4 liters.

What is the displacement of the Cummins/Onan 6BT5.9-G6?

The Cummins/Onan 6BT5.9-G6 has a displacement of 5.9 liters with 6 cylinders.

Which generators use the Cummins/Onan 6BT5.9-G6 engine?

The Cummins/Onan 6BT5.9-G6 powers 3 generator set(s), including Cummins/Onan C110D6, Cummins/Onan C120D5, Cummins/Onan DGDB.