The Generac 1.5L is a 1.5 L 4-cylinder naturally aspirated engine rated at 3600 rpm. It powers generator sets from Generac, including the Guardian Liquid-cooled, QT020, QT025 and QT030. It holds 3.79 L (1.0 gal) of oil and 7.57 L (2.0 gal) of coolant.
Part of the Generac 1.5L engine family — 2 variants share parts & fitment.
| Oil capacity | 3.785 L |
|---|---|
| Coolant capacity | 7.57 L |
| Displacement | 1.5 L |
| Cylinders | 4 |
| Aspiration | Naturally Aspirated |
| Rated speed | 3600 rpm |
| Part # | Description | Category |
|---|---|---|
| 59402 | Air Cleaner | air_filter |
| 166-A4531 | Cover, Timing Belt, Upper | belt |
| 167-A4531 | Cover, Timing Belt, Lower | belt |
| 199-A4531 | Belt, Valve Timing | belt |
| 200-A4531 | Spring, Valve Timing Belt Tensioner | belt |
| 0A45310257 | GASKET INLET MANIFOLD | gasket |
| 0A45310258 | GASKET-EXHAUST MANIFOLD | gasket |
| 100-A4531 | Gasket kit, Engine Overhaul | gasket |
| 101-A4531 | Gasket kit, Engine Overhaul, Upper | gasket |
| 103-A4531 | Gasket, Rocker Cover | gasket |
| 104-A4531 | Gasket, PCV Valve | gasket |
| 110-A4531 | Gasket, Engine Oil Filler Cap | gasket |
| 113-A4531 | Gasket, Cylinder Head | gasket |
| 146-A4531 | Gasket, Rear Oil Seal Case | gasket |
| 164-A4531 | Gasket, Engine Oil Pan Drain Plug | gasket |
| 172-A4531 | Gasket, Timing Belt Cover | gasket |
| 180-A4531 | Gasket, Oil Strainer | gasket |
| 257-A4531 | Gasket, Intake Manifold | gasket |
| 258-A4531 | Gasket, Exhaust Manifold | gasket |
| 59401 | Carburetor Gasket | gasket |
| 0A5110 | PIPE WATER-INLET | hose |
| 0A6258 | HOSE - UPPER RADIATR | hose |
| 0A6284 | HOSE - LOWER RADIATR | hose |
| 69811 | Oil Hose Drain Cap | hose |
| 0A45310244 | FILTER OIL | oil_filter |
| 244-A4531 | Oil Filter | oil_filter |
| 0A4355 | MANIFOLD-EXHAUST | other_service |
| 102-A4531 | Cover, Rocker | other_service |
| 105-A4531 | Valve, PCV | other_service |
| 109-A4531 | Cap Assembly, Engine Oil Filler | other_service |
| 111-A4531 | Head Assembly, Engine Cylinder | other_service |
| 136-A4531 | Block Assembly, Cylinder | other_service |
| 162-A4531 | Oil Pan, Engine | other_service |
| 163-A4531 | Plug, Engine Oil Pan | other_service |
| 182-A4531 | Crankshaft | other_service |
| 184-A4531 | Connecting Rod Assembly | other_service |
| 186-A4531 | Bearing, Connecting Rod, Plain STD (S1) | other_service |
| 189-A4531 | Piston and Pin Assembly, STD | other_service |
| 193-A4531 | Ring Set, Piston, STD | other_service |
| 198-A4531 | Camshaft | other_service |
| 201-A4531 | Sprocket, Camshaft | other_service |
| 261-A4531 | Distributor Cap | other_service |
| 264-A4531 | Rotor, Distributor | other_service |
| 112-A4531 | Cover, Cylinder Head Fuel Pump Hole | pump |
| 247-A4531 | Water Pump | pump |
| 122-A4531 | Oil Seal, Camshaft | seal |
| 158-A4531 | Oil Seal, Rear Main | seal |
| 161-A4531 | Oil Seal, Oil Filler Tube | seal |
| 238-A4531 | Crankshaft Front Oil Seal | seal |
| 0A6751 | SW-TMP 245DEG 3/8NPT | sensor |
| 0A8584 | FILTER, OIL (FRAM#PH3614) | sensor |
| 275-A4531 | Spark Plug | spark_plug |
| 075885 | THERMOSTAT 195 DEG | thermostat |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The Generac 1.5L engine has an oil capacity of 3.785 liters.
The Generac 1.5L has a displacement of 1.5 liters with 4 cylinders.
The Generac 1.5L powers 4 generator set(s), including Generac Guardian Liquid-cooled, Generac QT020, Generac QT025, Generac QT030.