HomeEnginesCummins/Onan 4BTA3.9-G3

Cummins/Onan 4BTA3.9-G3 Engine Engine

The Cummins/Onan 4BTA3.9-G3 is a 3.9 L 4-cylinder turbocharged and jacket water aftercooled engine rated at 1500 rpm, producing up to 80.6 kW. It powers generator sets from Cummins/Onan, including the DGCG. It holds 10.9 L (2.9 gal) of oil.

Part of the Cummins/Onan 4BTA3.9 engine family — 5 variants share parts & fitment.

3.9 L
Displacement
4
Cylinders
1500 rpm
Rated speed
80 kW
Gross power

Engine specifications

Oil capacity10.9 L
Displacement3.9 L
Cylinders4
AspirationTurbocharged and Jacket Water Aftercooled
Rated speed1500 rpm
Gross power80 kW

Generator sets powered by this engine

1

Parts cataloged across the Cummins/Onan 4BTA3.9 family

17
Part #DescriptionCategory
2.4LEngineengine
285542Gasket. manifoldgasket
265484Line. flex. fuel, 41"hose
266110Line, flex. fuel, 50”hose
271500Line. flex. fuel, 22”hose
285498Hose, moldedhose
285722Hose, upper moldedhose
285957Line. flex. fuel. 18”hose
X-797-2Line, fuelhose
A046K020Oil Filteroil_filter
0L2090-C60 kW (2.4 L)other_service
A-290538Block heaterother_service
A-290885Heater, block (240V)other_service
240976Switch, high temperature 268298 Sender, temperaturesensor
241481Switch, high temperature 268298 Sender, water temperaturesensor
268298Sender, water temperature gaugesensor
290090Switch, low water temperaturesensor

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 4BTA3.9-G3?

The Cummins/Onan 4BTA3.9-G3 engine has an oil capacity of 10.9 liters.

What is the displacement of the Cummins/Onan 4BTA3.9-G3?

The Cummins/Onan 4BTA3.9-G3 has a displacement of 3.9 liters with 4 cylinders.

Which generators use the Cummins/Onan 4BTA3.9-G3 engine?

The Cummins/Onan 4BTA3.9-G3 powers 1 generator set(s), including Cummins/Onan DGCG.