Lifan LF173fmm Oil Pump

Lifan LF173FMM Oil Pump

🔧 Oil Pump · Lubrication System · Engine Core Component

Fits Lifan LF173FMM 250cc ATV · Compatible with many others

This is an OEM-specification oil pump designed for the Lifan LF173FMM 250cc engine, primarily used in ATV (All-Terrain Vehicle) applications. The oil pump is the heart of the engine's lubrication system, responsible for delivering oil from the sump to all moving parts, ensuring proper lubrication of the crankshaft, connecting rods, pistons, valve train, and other critical components.

Manufactured with precision engineering, this oil pump ensures stable oil pressure and flow, effectively reducing engine wear and extending engine life. In addition to the Lifan LF173FMM 250cc ATV, this oil pump is compatible with many other vehicles using the same engine platform.

The oil pump is the "heart" of the engine, responsible for delivering oil to all components requiring lubrication:

• Lubrication & Wear Reduction: Creates an oil film between moving parts, reducing metal-to-metal contact, friction, and wear.
• Cooling: Circulating oil carries away heat from internal engine components.
• Cleaning: Flushes away metal particles and carbon deposits from internal engine surfaces.
• Sealing: Forms an oil seal between piston rings and cylinder walls, improving compression.
• Rust Prevention: Protects metal surfaces from oxidation and corrosion.

Consequences of Oil Pump Failure: Low oil pressure leads to inadequate lubrication, causing abnormal noise, overheating, seized pistons, spun bearings, and potentially catastrophic engine failure. Regular inspection and timely replacement of a faulty oil pump is critical.

Primary Application: Lifan LF173FMM 250cc ATV

Other Compatible Vehicles:

• Various ATV models using the Lifan LF173FMM engine
• Other brand ATVs using the same 250cc engine platform
• Some dirt bikes, go-karts, and utility vehicles using this oil pump design
• Any vehicle requiring replacement of the LF173FMM oil pump

• Oil Pressure Light: Dashboard oil pressure warning light illuminates or flashes.
• Engine Noise: Unusual noises from valve train, crankshaft area, especially metallic knocking sounds.
• Overheating: Engine temperature runs abnormally high due to poor cooling.
• Low Oil Pressure: Pressure reading below specifications when tested with a gauge.
• No Oil Circulation: Lack of oil return or splash visible when opening the valve cover.

If you experience these symptoms, stop using the engine immediately, inspect the oil pump, and replace if necessary.

🔧 Installation Tip

1. The oil pump is located inside the engine; replacement requires removing the engine side cover or oil pan.
2. Professional installation or significant engine repair experience is recommended.
3. Clean the mounting surface before installation to prevent debris from entering oil passages.
4. Pay attention to pump positioning and drive gear engagement during installation.
5. After installation, fill with proper amount of oil. Before starting, you may remove the spark plug and crank the engine to prime the oil pump.
6. After starting, check for normal oil pressure and inspect for any oil leaks.

⚠️ Important Notice: This is an oil pump for the Lifan LF173FMM 250cc ATV engine, suitable for LF173FMM engines and other vehicles using the same oil pump. The oil pump is a critical engine component; replacement requires proper mechanical knowledge and skills. Images are for reference only. The actual product may vary.