Introduction
The TORCH F5RTC Spark Plug is a critical component for the ignition system of gasoline or gas engines. Manufactured by TORCH, a company with over 60 years of experience in spark plug production, this product is designed for reliable performance across various applications. It aims to improve fuel efficiency, reduce emissions, and ensure fast, stable engine starts.
Spark plugs are wear parts that require regular inspection and replacement to maintain optimal engine performance. This manual provides essential information for proper use and maintenance of your TORCH F5RTC spark plug.
Compatibility
The TORCH F5RTC Spark Plug (part number 98079-55846) is compatible with a wide range of engines and can replace several OEM spark plugs. Always verify compatibility with your specific equipment's manual before installation.
Cross-Reference Compatibility:
- NGK: 7734 / BPR5ES V-line-6
- Champion: 322 / RN11YC, 404 / RN12YC, 8405 R44CXLS, RN11Y, RN11YC4, RN11YCC, RN12Y, RN12YCC, RN13L, RN13LYC, RN14LY, RN14Y, RN8L, RN9YC, RN9YCC
- Denso: 5305 / IW16, 3256 / J16CR-U, 3013 / W14EXR-U, 3021 / W16EPR-U, 3031 / W16EXR-U, W16TT, VW16
- Harley Davidson: 5RL
- Landrover: ERR3799
- Motorcraft: AGS52CF4
- Kawasaki: 92070-2077, 92070-2088
- Autolite: 4265, 65, 66, 945
- Daihatsu: 90048-51048-000
- HONDA: 89819-99010 / 98079-55817 / 98079-55846 / 98079-55876
- Yamaha: 94701-00328 / 94703-00328
- SUZUKI: 09482-00155 / 09482-00506
Specifications
| Feature | Detail |
|---|---|
| Model Number | F5RTC |
| Calorific Value | 5 |
| Hex Rim Size | 20.8 mm |
| Thread Length | 19 mm |
| Thread Diameter | 14 mm (M14*1.25) |
| Core Material | Copper |
| Top Material Type | Ceramic |
| Vehicle Service Type | Motorcycle, Lawn Mower, Car, Truck, Watercraft |
| Item Weight | 1.41 ounces |
| Product Dimensions | 1 x 5 x 7 inches |

Image: Detailed diagram of a spark plug, highlighting its dimensions including 20.8mm hex rim, 19mm thread length, and M14*1.25 thread diameter.
Installation Process
Proper installation of the spark plug is crucial for optimal engine performance and longevity. Follow these general steps for installation. Always refer to your equipment's specific service manual for detailed instructions and torque specifications.
- Prepare Tools: Gather necessary tools including a spark plug wrench, torque wrench, and any other tools required to access the spark plug.
- Remove Old Spark Plug: Ensure the engine is cool before starting. Disconnect the spark plug wire. Use a spark plug wrench to carefully remove the old spark plug.
- Inspect and Compare: Compare the new TORCH F5RTC spark plug with the old one to ensure they are identical in type and size. Check the gap of the new spark plug according to your engine's specifications.
- Install New Spark Plug: Thread the new spark plug into the cylinder by hand to prevent cross-threading. Once finger-tight, use a torque wrench to tighten it to the manufacturer's specified torque.
- Reconnect Spark Plug Wire: Firmly reattach the spark plug wire.

Image: A visual guide illustrating the six steps of spark plug installation: Prepare Tools, Take the Old Out, Compare the New & the Old, Use Spark Plug Sleeve, Install Spark Plugs into Cylinders, and Install Ignition Coils.
Spark Plug Installation Torque Specifications:
| Spark Plug Type | Torque (N·m) |
|---|---|
| Flat Seat (with external gasket) | 10 ~ 15 |
| Conical Seat (without external gasket) | 10 ~ 15 |
| M10 Flat Seat Spark Plug | 10 ~ 15 |
| M12 Flat Seat Spark Plug | 20 ~ 25 |
| M12 Conical Seat Spark Plug | 10 ~ 15 |
| M14 Flat Seat Spark Plug | 25 ~ 30 |
| M14 Conical Seat Spark Plug | 10 ~ 15 |
| M18 Flat Seat Spark Plug | 35 ~ 40 |
| M18 Conical Seat Spark Plug | 20 ~ 25 |
Remarks: On Diesel Engine Refitted engine or other cast iron engine, the installation torque takes the maximum value of the corresponding value ±3N.m.
Video: A short demonstration of the TORCH F5RTC spark plug, showing its physical appearance and features.
Video: Another view of the TORCH F5RTC spark plug, highlighting its design and construction.
Operating Benefits
The TORCH F5RTC spark plug is engineered to provide several performance benefits for your engine:
- Longer Service Life: Designed for durability and extended use.
- Fast Starts: Ensures quick and reliable engine ignition.
- Reduced Emissions: Contributes to cleaner engine operation.
- Improved Fuel Efficiency: Optimizes fuel combustion for better mileage.
- Stable Performance: Maintains consistent engine operation under various conditions.

Image: An infographic detailing the features and benefits of TORCH spark plugs, including fast starts, reduced emissions, fuel economy, and long lifespan.
Maintenance
Regular inspection and timely replacement of spark plugs are essential for maintaining engine health and performance. Spark plugs are wearing parts and their condition directly impacts engine efficiency.
Replacement Guidelines:
- Turbocharged Models: Replace every 15,000 to 20,000 km.
- Naturally Aspirated Models: Replace every 20,000 to 30,000 km.
- Iridium/Platinum Spark Plugs: Can last 50,000 to 60,000 km.
These are general guidelines. Always consult your vehicle or equipment's maintenance manual for specific replacement intervals. Driving conditions, habits, and fuel quality can also influence spark plug lifespan.

Image: A comparative chart illustrating the lifespan, electrode gap, and fuel efficiency ratings for various spark plug types, including Electrode, Platinum, Iridium, Iridium Platinum, and Double Iridium.
Troubleshooting
If your engine exhibits any of the following symptoms, it may indicate that your spark plugs need inspection or replacement:
- Difficulty starting the engine.
- Rough idling or engine misfires.
- Reduced fuel economy.
- Loss of engine power or acceleration.
- Increased exhaust emissions.
If you experience these issues, inspect your spark plugs for signs of wear, fouling, or damage. Replacing worn-out spark plugs with new TORCH F5RTC spark plugs can often resolve these problems and restore engine performance.
Important Tips
- Always ensure the engine is cool before attempting any spark plug installation or removal.
- Use a torque wrench to tighten spark plugs according to the specified torque values to prevent overtightening or undertightening.
- Avoid using electric tools for tightening spark plugs, as this can lead to damage.
- Keep the spark plug and surrounding area clean and free of oil stains throughout the entire process.

Image: A visual reminder with "WARMING TIPS" to ensure the engine is cool before installation, use a torque wrench, avoid electric tools, and keep the area clean. It shows a comparison between a new and a used spark plug.
Warranty and Support
For any questions regarding the TORCH F5RTC Spark Plug, including warranty information or technical support, please contact TORCH customer service or visit the official TORCH Store. Ensure you have your product model number (F5RTC) and any relevant purchase details available when seeking support.
TORCH has a long history of innovation and quality in spark plug manufacturing, committed to providing reliable products for various engine types.





