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Cummins/Onan 6L8.9TAA-G4 Engine

Name: Cummins/Onan 6L8.9TAA-G4 Engine
Brand: Cummins/Onan

The Cummins/Onan 6L8.9TAA-G4 is a 8.9 L 6-cylinder turbocharged, charge air cooled engine rated at 1500 rpm, producing up to 303 kW. It powers generator sets from Cummins/Onan, including the L8.9 Series. It holds 20 L (5.3 gal) of oil and 36.8 L (9.7 gal) of coolant.

Also known as: Cummins® 6L8.9TAA-G4

8.9 L

Displacement

Cylinders

1500 rpm

Rated speed

303 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ

Engine specifications

Oil capacity	20.0 L
Coolant capacity	36.8 L
Displacement	8.9 L
Cylinders	6
Aspiration	Turbocharged, Charge air cooled
Rated speed	1500 rpm
Gross power	303 kW

Generator sets powered by this engine

Cummins/Onan L8.9 Series

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

Maintenance schedule

Item	Spec	Capacity	Part #
Air filter	Dry type, Replaceable paper element air cleaner with restriction indicator		—
Fuel filter	Dual fuel filter system: Pre filter including water separator and main filter		—
Oil filter	Full flow spin on lube oil filter		—
Battery	2 x 12 V DC batteries		—
Belt	N/A		—
Coolant	Lubrication system capacity (30-20) litre, Total coolant capacity (36.8) litre	36.8 l	—
Oil	CI4+ 15W40	34.0 l	—
Spark plug	N/A		—

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 6L8.9TAA-G4?

The Cummins/Onan 6L8.9TAA-G4 engine has an oil capacity of 20.0 liters.

What is the displacement of the Cummins/Onan 6L8.9TAA-G4?

The Cummins/Onan 6L8.9TAA-G4 has a displacement of 8.9 liters with 6 cylinders.

Which generators use the Cummins/Onan 6L8.9TAA-G4 engine?

The Cummins/Onan 6L8.9TAA-G4 powers 1 generator set(s), including Cummins/Onan L8.9 Series.