Home›Engines›Generac 9.0L

Generac 9.0L Engine

Name: Generac 9.0L Engine
Brand: Generac

The Generac 9.0L is a 8.9 L 8-cylinder naturally aspirated engine rated at 1800 rpm, producing up to 111.2 kW. It powers generator sets from Generac, including the MG 150 and SG080. It holds 9.5 L (2.5 gal) of oil and 5.5 L (1.5 gal) of coolant.

Also known as: 9.0 L, Generac 9.0L

8.9 L

Displacement

Cylinders

1800 rpm

Rated speed

111 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Torque & specs Fluids Wiring

Engine specifications

Oil capacity	9.5 L
Coolant capacity	5.5 L
Displacement	8.9 L
Cylinders	8
Aspiration	Naturally Aspirated
Rated speed	1800 rpm
Gross power	111 kW

Generator sets powered by this engine

Generac MG 150 Generac SG080

How to read your Generac engine serial & model number →

Common problems

Unit is set to OFF, but engine continues to run
Cause: Faulty keypad.
Fix: Contact an IASD.
No transfer to standby after utility source failure
Cause: Faulty transfer switch coil.
Fix: Contact an IASD.
No AC output from generator
Cause: Main line circuit breaker (MLCB) (generator disconnect) is OFF (OPEN).
Fix: Set MLCB (generator disconnect) to ON (CLOSED).
Engine starts hard and runs rough
Cause: Air cleaner plugged or damaged.
Fix: Inspect/replace air cleaner.
Engine does not crank
Cause: Fuse blown.
Fix: Replace 7.5 amp fuse in generator control panel. Correct short circuit condition if fuse blows again.
Engine cranks but will not start
Cause: Out of LP fuel.
Fix: Replenish LP fuel. Turn on fuel shutoff valve.

Compiled from service & troubleshooting documentation across every generator set that uses the Generac 9.0L.

Maintenance schedule

Item	Capacity	Part #	Interval
Air filter		012630	1000 hr	Amazon eBay
Fuel filter		—
Oil filter		—	1000 hr
Battery		—	1000 hr
Belt		—
Coolant	9.5 L	—
Coolant filter		—
Oil		—	200 hr
Spark plug		—	1000 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service specifications

Type	Item	Value	Unit	Condition
Other	Max Harmonics	3.50	%
Pressure	Maximum External Press Drop on Radiator	0.5	inches H2O

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Fuel	Natural Gas				950 BTU / Cu.Ft

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
208		Parallel Wye Network
480		Series Wye Network

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

What is the oil capacity of the Generac 9.0L?

The Generac 9.0L engine has an oil capacity of 9.5 liters.

What is the displacement of the Generac 9.0L?

The Generac 9.0L has a displacement of 8.9 liters with 8 cylinders.

Which generators use the Generac 9.0L engine?

The Generac 9.0L powers 2 generator set(s), including Generac MG 150, Generac SG080.

How often should you change the oil in the Generac 9.0L?

The Generac 9.0L oil change interval is every 200 hours.

What is a common problem with the Generac 9.0L engine?

A commonly reported issue on generators using the Generac 9.0L is: Unit is set to OFF, but engine continues to run. Cause: Faulty keypad.. Fix: Contact an IASD..