Home›Engines›Generac GP3300i

Generac GP3300i Engine

Name: Generac GP3300i Engine
Brand: Generac

The Generac GP3300i is a 0.15 L 1-cylinder 4-stroke engine. It powers generator sets from Generac, including the GP3300. It holds 0.6 L (0.2 gal) of oil.

Also known as: Generac GP3300i

0.149 L

Displacement

Cylinders

0.6 L

Oil capacity

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Fluids Fault codes Procedures

Engine specifications

Oil capacity	0.6 L
Displacement	0.149 L
Cylinders	1
Aspiration	4-stroke

Generator sets powered by this engine

Generac GP3300

How to read your Generac engine serial & model number →

Common problems

No AC output.
Cause: 1. Generator is overloaded. 2. Inverter module is overheated. 3. Short circuit in electrical device. 4. Defective inverter assembly.
Fix: 1. Disconnect all loads. Shut down generator to reset module. Reduce loads, restart generator. 2. Verify service door is ON. Let cool 15 minutes by running engine without AC output. Press and hold Reset button on control panel, restart generator. 3. Verify condition of extension cords and items being powered. Press and hold Reset button on control panel. 4. Contact IASD.
Fuel leaks from drain hoses.
Cause: 1. Carburetor drain in bowl is not closed.
Fix: 1. Turn valve clockwise to close.
Engine won't start.
Cause: 1. Dial turned off. 2. Out of fuel. 3. Defective spark plug. 4. Plugged fuel filter. 5. Defective or stuck Dial assembly. 6. Incorrect engine oil level. 7. Defective ignition coil. 8. Carb is flooded. 9. Throttle plate closed.
Fix: 1. Turn on Dial. 2. Fill fuel tank. 3. Replace spark plug. 4. Replace fuel and fuel filter. 5. Contact IASD. 6. Check/fill engine oil. 7. Contact IASD. 8. Drain carb. 9. Open throttle plate (push toward back of unit).
Engine will not start; or starts and runs rough.*
Cause: 1. Choke is stuck or left on. 2. Dirty or clogged air filter. 3. Defective or dirty spark plug. 4. Dirty fuel filter. 5. Dirty or gummed up carburetor. 6. Unit not warmed up. 7. Spark arrestor clogged.
Fix: 1. Turn choke off. 2. Clean or replace air filter. 3. Replace spark plug. 4. Replace fuel and fuel filter. 5. Clean carburetor. 6. Gradually adjust Dial and reduce choke until engine runs smoothly in RUN position. 7. Clean spark arrestor.
Engine starts, then shuts down.
Cause: 1. Out of fuel. 2. Incorrect engine oil level. 3. Contaminated fuel. 4. Defective low oil level switch.
Fix: 1. Fill fuel tank. 2. Check engine oil level. 3. Contact IASD. 4. Contact IASD.

Compiled from service & troubleshooting documentation across every generator set that uses the Generac GP3300i.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			011948	300 hr	Amazon eBay
Fuel filter	Replace fuel filter as needed		—	300 hr
Oil filter	Change oil filter every 300 hours or annually		—	300 hr
Battery	Not explicitly stated in the document		—
Belt			—
Coolant	Not explicitly stated in the document		—	300 hr
Coolant filter			—
Oil	At Each Use, Every 100 Hours or Every 6 Months	0.6 L	—	100 hr
Spark plug	Check/replace crankcase breather hose, check/fittings/fasteners, inspect valve clearance and adjust if necessary after first 50 hours of operation and every 300 hours thereafter		0K95530157	300 hr	Amazon eBay

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

Service intervals

Item	Action	Hours	Months	Notes
Engine oil level	Inspect	8 hr		Prior to each use or every 8 hours of operation
Valve clearance	Check	50 hr		First service — Check and adjust if necessary after first 50 hours of operation and every 300 hours thereafter
Air Filter	Clean	100 hr	6 mo	Every 100 Hours or Every 6 Months
Engine Oil	Change	100 hr	6 mo	First service — Every 100 Hours or Every 6 Months
Muffler Screen	Clean	100 hr	6 mo	Every 100 Hours or Every 6 Months
Spark arrestor	Clean	100 hr	6 mo	Muffler Screen; Clean/Replace Spark Arrestor; inspect and clean screen every 100 hours or six months
Crankcase breather hose	Check	300 hr	12 mo	Check/Replace
Fittings/fasteners	Check	300 hr	12 mo	To be performed by an IASD
Fuel filter	Replace	300 hr	12 mo	To be performed by an IASD
Spark Plug	Replace	300 hr	12 mo	Every 300 Hours or Every Year
Valve Clearance	Adjust	300 hr	12 mo	Every 300 Hours or Every Year

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

Service specifications

Type	Item	Value	Unit	Condition
Gap	Spark plug gap	0.024-0.028	in
Gap	Spark plug gap	0.6-0.7	mm
Resistance	Exciter Windings - GP1800 (alt 0H8255/0J0819)	2.53	Ohms
Resistance	Exciter Windings - GP3250 (alt 0H2626/0H3578)	1.72	Ohms
Resistance	Exciter Windings - GP5500/GP/LP5500 (alt 0G9769/0J8363)	2.81	Ohms
Resistance	Exciter Windings - GP6500E (alt 0H9920/0K1291)	2.9 ± 10%	Ohms
Resistance	Exciter Windings - GP7500E DF-CO (alt A0001920613/A0000121536)	1.928	Ohms
Resistance	Exciter Windings - GP8000E COSTCO (alt 0J8438/0K9791)	1.626	Ohms
Resistance	Exciter Windings - LP3250 (alt 0J2561/0J6032)	2	Ohms
Resistance	Power Windings - GP1800 (alt 0H8255/0J0819)	0.798	Ohms
Resistance	Power Windings - GP3250 (alt 0H2626/0H3578)	0.62	Ohms
Resistance	Power Windings - GP5500/GP/LP5500 (alt 0G9769/0J8363)	0.681	Ohms
Resistance	Power Windings - GP6500E (alt 0H9920/0K1291)	0.6 ± 10%	Ohms
Resistance	Power Windings - GP7500E (alt 0J1927/0K8981)	1.62	Ohms
Resistance	Power Windings - GP7500E DF-CO (alt A0001920613/A0000121536)	0.491	Ohms
Resistance	Power Windings - GP8000E COSTCO (alt 0J8438/0K9791)	0.471	Ohms
Resistance	Power Windings - LP3250 (alt 0J2561/0J6032)	0.63	Ohms
Resistance	Rotor Windings - GP1800 (alt 0H8255/0J0819)	29.4	Ohms
Resistance	Rotor Windings - GP3250 (alt 0H2626/0H3578)	31	Ohms
Resistance	Rotor Windings - GP5500/GP/LP5500 (alt 0G9769/0J8363)	61.48	Ohms
Resistance	Rotor Windings - GP6500E (alt 0H9920/0K1291)	69 ± 10%	Ohms
Resistance	Rotor Windings - GP7500E (alt 0J1927/0K8981)	58.8	Ohms
Resistance	Rotor Windings - GP7500E DF-CO (alt A0001920613/A0000121536)	52.42	Ohms
Resistance	Rotor Windings - GP8000E COSTCO (alt 0J8438/0K9791)	52.17	Ohms
Resistance	Rotor Windings - LP3250 (alt 0J2561/0J6032)	58	Ohms
Speed	No-load AC frequency	62.0-62.5	hertz	running adjustment, no-load
Torque	Governor Lever Clamp Bolt	110	in-lbs (12.4 Nm)
Torque	Governor Lever Clamp Bolt	70	in-lbs (8 Nm)
Torque	Rocker Arm Jam Nut	14	ft-lbs (19 Nm)
Torque	Rocker Arm Jam Nut	6-9	ft-lbs (8-12 Nm)
Torque	Rocker Arm Jam Nut	7	ft-lbs (9.4 Nm)
Torque	Rocker Arm Jam Nut	9-12	ft-lbs (12-16 Nm)
Valve clearance	Exhaust Valve Clearance	0.004-0.006	in (0.01-0.015 mm)
Valve clearance	Exhaust Valve Clearance	0.0059	in (0.015 mm)
Valve clearance	Exhaust Valve Clearance	0.006 ± 0.001	in (0.15 ± 0.02 mm)
Valve clearance	Exhaust valve clearance	0.10 ± 0.02	mm	cold
Valve clearance	Intake Valve Clearance	0.002-0.004	in (0.005-0.01 mm)
Valve clearance	Intake Valve Clearance	0.0039	in (0.01 mm)
Valve clearance	Intake Valve Clearance	0.004 ± 0.001	in (0.1 ± 0.02 mm)
Valve clearance	Intake valve clearance	0.10 ± 0.02	mm	cold
Valve clearance	Valve Clearance	0.003-0.005	in (0.0076-0.0127 mm)
Valve clearance	Valve Clearance	0.005-0.007	in (0.013-0.017 mm)

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	Capacity	Notes
Engine oil	10W-30 / SAE 30		0.6 L	Recommended Oil 10W-30 / SAE 30; Oil Capacity 0.6 qt (0.6 L); Lubrication Method: Splash
Engine oil	SAE 30, 10W-30, Synthetic 5W-30		0.6 L	Multi-viscosity options per ambient temperature
Engine oil	SAE 30, 10W-30, or Synthetic 5W-30		0.6 L	Use petroleum based oil (supplied) for engine break-in before using synthetic oil
Fuel		Unleaded	4.3 L	1.14 U.S. gallons fuel capacity
Fuel	Unleaded gasoline, minimum 87 octane/87 AKI (91 RON), up to 10% ethanol acceptable; do not use E85		4.3 L	Do not use a gas oil mix; stabilize fuel prior to storage

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

Fault codes

Code	Name	Meaning	Severity	Action
Red Short Flash	CO Module - Red Short Flash	Elevated level of CO in the area; module is functioning properly and protecting operators	Shutdown	Generator shuts down; module is functioning as intended

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

Procedures

Test 20 - Check Spark Plugs / Test 23 - Check Valve Adjustment adjustment

Tools: feeler gauge, crow foot wrench

Adjust valve clearance with engine at room temperature
Position piston at TDC of compression stroke (both valves closed), or set intake/exhaust valve fully open method
Loosen rocker arm jam nut; turn pivot ball stud while checking clearance with a feeler gauge
When clearance is correct, hold pivot ball stud and tighten rocker arm jam nut to specified torque with a crow foot wrench
Recheck valve clearance to make sure it did not change
Install rocker arm cover with a new gasket

Test 27 - Check / Adjust Governor adjustment

Tools: AC frequency meter

Loosen governor clamp bolt
Hold governor lever at wide open throttle position
Rotate governor shaft counterclockwise (389/208/196cc) or clockwise (410cc) as far as it will go
Tighten governor lever clamp bolt to 110 in-lbs (389/208/196cc) or 70 in-lbs (410cc)
Turn speed adjustment screw counterclockwise three full turns to avoid overspeed
Start engine and let warm up under no-load
Connect AC frequency meter; no-load frequency should be 62.0-62.5 hertz
Turn speed adjust screw until frequency/RPM is within limits
Apply removable Loctite (Loctite 241) to speed adjust screw threads

Test 41 - CO Module Verification Test diagnostic

⚠ Do NOT insert the drill bit into the LED holes; damage to the LEDs will occur

Tools: 3/64 inch drill bit

Do not install CO badging (decal) prior to performing this test
Run generator under normal operation with no CO module notifications for a minimum of 65 seconds
With generator running, insert blunt end of a 3/64 inch drill bit into test switch hole
Hold the drill bit against the mounting panel until notification LEDs appear and generator shuts off
Successful pin test shows both LEDs on solid (not blinking)

Remove Contents from Carton installation

Open carton completely by cutting each corner from top to bottom.
Remove and verify carton contents prior to assembly.
Call Generac Customer Service with unit model and serial number for any missing carton contents.
Record model, serial number, and date of purchase on front cover of this manual.

Add Engine Oil maintenance

⚠ Engine damage. Verify proper type and quantity of engine oil prior to starting engine.

Tools: funnel

Place generator on a level surface.
Remove screws and side cover.
Remove oil fill cap/dipstick and wipe dipstick clean.
Insert funnel into oil fill opening and add recommended engine oil.
Insert dipstick without screwing it in; verify oil level is within safe operating range.
Install oil fill cap/dipstick and hand-tighten.
Install side panel and screws.

Change Engine Oil maintenance

⚠ Risk of burns. Allow engine to cool before draining oil or coolant.

⚠ Accidental start-up. Disconnect spark plug wires when working on unit.

Tools: funnel, container

Place generator on a level surface.
Remove screws, side cover and spark plug cover.
Disconnect the spark plug wire and place where it cannot contact spark plug.
Clean area around oil fill and oil drain plug.
Remove oil fill cap/dipstick and wipe dipstick clean.
Tip unit and drain oil completely into a suitable container.
Install oil drain plug and tighten securely.
Insert funnel and add recommended engine oil.
Verify oil level is within safe operating range.
Install oil fill cap/dipstick and hand-tighten.
Wipe up any spilled oil.
Install side panel, screws, and spark plug cover.
Properly dispose of oil in accordance with all applicable regulations.

Inspect Spark Arrestor Screen maintenance

⚠ Hot Surfaces. Do not touch hot surfaces. Keep machine away from combustibles during use.

Remove the clamp to remove retainer.
Slide spark arrestor screens out from the muffler outlet tube.
Inspect screens and replace if torn, perforated or otherwise damaged; clean with a commercial solvent if not damaged.
Replace the screens, retainer, and secure with clamp.

Prepare Fuel System/Engine for Storage maintenance

⚠ Vision Loss. Eye protection is required to avoid spray from spark plug hole when cranking engine.

Loosen screw (A) and drain fuel from carburetor.
Change engine oil.
Remove spark plug.
Pour tablespoon (5-10cc) of clean engine oil or spray a suitable fogging agent into cylinder.
Pull starter recoil several times to distribute oil in cylinder.
Install spark plug.
Pull recoil slowly until resistance is felt to close valves; gently release recoil.

Service Air Filter maintenance

Unscrew bolt (A) and remove air filter cover.
Wash filter (B) in soapy water.
Squeeze dry in clean cloth (DO NOT TWIST).
Clean air filter cover before installation.
Replace side cover and screws.

Service Spark Plug maintenance

Tools: feeler gauge, spark plug wrench

Remove spark plug cover and disconnect spark plug wire.
Clean area around spark plug.
Remove and inspect spark plug.
Inspect electrode gap with feeler gauge and reset spark plug gap to 0.6 - 0.7 mm (0.024 - 0.028 in).
Install spark plug finger tight, and tighten an additional 3/8 to 1/2 turn using spark plug wrench.

Generator Shut Down operation

⚠ Equipment and property damage. Disconnect electrical loads prior to starting or stopping unit.

Shut off all loads and unplug electrical loads from generator panel receptacles.
Let engine run at no-load for several minutes to stabilize internal temperatures of engine and generator.
Rotate PowerDial to OFF (3).

Starting Hot Engines operation

Turn PowerDial from OFF to RUN to open the fuel valve and permit starting.
Firmly grasp recoil handle and pull slowly until increased resistance is felt. Pull rapidly up and away.

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 GP3300i?

The Generac GP3300i engine has an oil capacity of 0.6 liters.

What is the displacement of the Generac GP3300i?

The Generac GP3300i has a displacement of 0.149 liters with 1 cylinders.

Which generators use the Generac GP3300i engine?

The Generac GP3300i powers 1 generator set(s), including Generac GP3300.

How often should you change the oil in the Generac GP3300i?

The Generac GP3300i oil change interval is every 100 hours.

What is a common problem with the Generac GP3300i engine?

A commonly reported issue on generators using the Generac GP3300i is: No AC output.. Cause: 1. Generator is overloaded. 2. Inverter module is overheated. 3. Short circuit in electrical device. 4. Defective inverter assembly.. Fix: 1. Disconnect all loads. Shut down generator to reset module. Reduce loads, restart generator. 2. Verify service door is ON. Let cool 15 minutes by running engine without AC output. Press and hold Reset button on control panel, restart generator. 3. Verify condition of extension cords and items being powered. Press and hold Reset button on control panel. 4. Contact IASD..