Introduction
This manual provides essential information for the safe and efficient operation and maintenance of your Loncin G390F gasoline engine. The Loncin G390F is a high-quality, reliable single-cylinder, 4-stroke, Overhead Valve (OHV) gasoline engine, widely used in various garden and construction motorized equipment. Please read this manual thoroughly before operating the engine.
For non-visual users: The image displays two Loncin G390F gasoline engines. The engine on the left is predominantly black with a red fan cover, while the engine on the right is silver/grey with black components. Both engines feature a fuel tank on top, an air filter housing, and a manual recoil starter. The image highlights the compact design and robust construction of the engine.
Safety Information
Always prioritize safety when operating and maintaining the engine. Failure to follow safety instructions can result in serious injury or property damage.
- Read and understand all instructions before use.
- Ensure adequate ventilation when operating the engine to prevent carbon monoxide poisoning.
- Keep hands, feet, and clothing away from moving parts.
- Do not refuel the engine while it is running or hot.
- Store fuel in an approved container in a well-ventilated area.
- Wear appropriate personal protective equipment (PPE) such as gloves and eye protection.
Setup
- Unpacking: Carefully remove the engine from its packaging. Inspect for any shipping damage.
- Mounting: Securely mount the engine to your equipment using appropriate fasteners. Ensure the mounting surface is stable and level.
- Shaft Connection: The engine features a cylindrical shaft with a diameter of 25mm and a length of 60mm. Connect your equipment's drive system to this shaft, ensuring proper alignment and secure fastening.
- Oil Fill:
- Locate the oil fill cap/dipstick.
- Fill the engine crankcase with 1.1 liters of recommended engine oil (SAE 30 or 10W-30). Do not overfill.
- Check the oil level using the dipstick; it should be between the 'add' and 'full' marks.
- Fuel Fill:
- Ensure the engine is off and cool before adding fuel.
- Fill the 6.5-liter fuel tank with fresh, clean gasoline. Do not use old or contaminated fuel.
- Do not overfill the tank; leave space for fuel expansion.
- Securely replace the fuel cap.
Operating Instructions
- Pre-Start Checks:
- Verify oil level.
- Verify fuel level.
- Ensure air filter is clean and properly installed.
- Check all connections and fasteners for tightness.
- Starting the Engine (Manual Recoil Starter):
- Move the fuel valve to the "ON" position.
- If the engine is cold, move the choke lever to the "CLOSED" or "START" position. If the engine is warm, the choke may not be necessary.
- Move the throttle lever to the "FAST" or "START" position.
- Grasp the recoil starter handle firmly. Pull slowly until resistance is felt, then pull quickly and smoothly to start the engine. Do not pull the rope to its full extension.
- Once the engine starts, slowly move the choke lever to the "OPEN" or "RUN" position.
- Allow the engine to warm up for a few minutes before applying load.
- Stopping the Engine:
- Move the throttle lever to the "SLOW" or "IDLE" position.
- Move the engine switch to the "OFF" position.
- Turn the fuel valve to the "OFF" position.
- Operation:
- Operate the engine at appropriate speeds for the task. The maximum operating speed is 3600 RPM.
- Avoid sudden changes in throttle.
- Monitor engine performance and listen for unusual noises.
Maintenance
Regular maintenance is crucial for the longevity and optimal performance of your Loncin G390F engine.
Maintenance Schedule
| Item | Every Use | Every 25 Hours / Monthly | Every 100 Hours / Annually |
|---|---|---|---|
| Check Engine Oil Level | ✓ | ||
| Clean Air Filter | ✓ | ||
| Change Engine Oil | ✓ | ||
| Inspect Spark Plug | ✓ | ||
| Clean Cooling Fins | ✓ | ||
| Replace Spark Plug | ✓ |
Detailed Maintenance Procedures
- Engine Oil: Use SAE 30 or 10W-30 motor oil. Change oil when the engine is warm to ensure complete drainage. The oil sump volume is 1.1 liters.
- Air Filter: Clean the air filter regularly, especially in dusty conditions. Replace if damaged.
- Spark Plug: Inspect the spark plug (compatible types include BRISK LR15YC and OREGON 77-312-1) for wear and proper gap. Replace annually or if performance degrades.
- Cooling System: The engine is air-cooled. Ensure the cooling fins are free from dirt and debris to prevent overheating.
- Fuel System: Use fresh gasoline. If storing the engine for an extended period, drain the fuel tank and carburetor or use a fuel stabilizer.
Troubleshooting
This section provides solutions to common operational issues. For problems not listed here, consult a qualified service technician.
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine will not start | No fuel; old/stale fuel; fuel valve OFF; choke incorrect; spark plug fouled; low oil level. | Add fresh fuel; turn fuel valve ON; adjust choke; clean/replace spark plug; fill oil to correct level. |
| Engine runs poorly/lacks power | Dirty air filter; fouled spark plug; stale fuel; carburetor issues. | Clean/replace air filter; clean/replace spark plug; use fresh fuel; consult service technician for carburetor. |
| Engine overheats | Blocked cooling fins; low oil level; operating in high ambient temperatures. | Clean cooling fins; check/add oil; ensure proper ventilation. |
Specifications
| Feature | Specification |
|---|---|
| Engine Type | Single-cylinder, 4-stroke, Overhead Valve (OHV) |
| Equivalent Model | Honda GX 390 |
| Engine Displacement | 389 cm³ |
| Engine Power | 13.0 HP |
| Maximum RPM | 3600 rpm |
| Oil Sump Volume | 1.1 L |
| Fuel Tank Volume | 6.5 L |
| Number of Cylinders | 1 |
| Valve Arrangement | Overhead (OHV) |
| Starting System | Manual Recoil Starter (No electric starter) |
| Cooling System | Air-cooled |
| Lubrication System | Splash lubrication |
| Recommended Lubricant | Engine oil SAE 30, 10W-30 |
| Ignition System | Transistorized |
| Shaft Dimensions | Cylindrical, Diameter 25mm, Length 60mm |
| Dimensions (L×W×H) | 405 × 450 × 443 mm |
| Net Weight | 31 kg |
| Gross Weight | 34 kg |
Warranty and Support
The Loncin G390F gasoline engine comes with a 12-month warranty period from the date of purchase. This warranty covers defects in materials and workmanship under normal use and service.
For warranty claims, technical support, or service inquiries, please contact your original point of purchase or an authorized Loncin service center. Ensure you have your purchase receipt and engine model/serial number available.