1. Introduction
This manual provides essential information for the proper installation, maintenance, and understanding of your NGK PRO-V Small Engine Spark Plug, model BKR5E (NGK Stock #5393). Adhering to these instructions will help ensure optimal performance and longevity of the spark plug in compatible small engines.
Image 1.1: The NGK PRO-V Small Engine Spark Plug BKR5E. This image displays the complete spark plug, featuring the ceramic insulator with "NGK" branding, the metal hex nut, and the threaded electrode tip.
2. Product Features
- Model Number: 5393 (BKR5E)
- Brand: NGK
- Core Material: Copper
- Thread Size: 14mm
- Country Of Origin: United States
- Item Weight: Approximately 1.76 ounces
- Product Dimensions: Approximately 5.25 x 2.75 x 0.75 inches (packaging)
3. Installation Instructions
Proper installation is crucial for the performance and longevity of your spark plug. Always consult your engine's service manual for specific torque specifications and procedures.
3.1 Safety Precautions
- Ensure the engine is turned off and cool before beginning any work.
- Disconnect the spark plug wire to prevent accidental starting.
- Wear appropriate personal protective equipment, such as gloves and eye protection.
3.2 Removal of Old Spark Plug
- Carefully pull the spark plug boot from the existing spark plug. Avoid pulling on the wire itself.
- Use a spark plug socket wrench to loosen and remove the old spark plug. Turn counter-clockwise.
- Inspect the old spark plug for signs of wear or engine issues.
3.3 Installation of New Spark Plug
- Check Gap: Verify the spark plug gap is set according to your engine manufacturer's specifications. While NGK spark plugs are typically pre-gapped, it is good practice to confirm.
- Thread Carefully: Hand-thread the new spark plug into the cylinder head to avoid cross-threading. It should turn smoothly.
- Torque: Once hand-tight, use a torque wrench with the correct spark plug socket to tighten the plug to the manufacturer's specified torque. Over-tightening can damage the spark plug or cylinder head; under-tightening can lead to poor contact and overheating.
- Reconnect: Firmly push the spark plug boot back onto the new spark plug until it clicks into place.
4. Operating Considerations
Once the new spark plug is installed, ensure all connections are secure before starting the engine. The engine should start smoothly and run consistently. If any issues arise, refer to the troubleshooting section or your engine's service manual.
5. Maintenance
Regular inspection and timely replacement of spark plugs are vital for engine health.
- Inspection: Periodically inspect the spark plug for signs of wear, fouling, or damage. The ceramic insulator should be clean and free of cracks. The electrode should not be excessively worn.
- Replacement Interval: Follow your engine manufacturer's recommended replacement schedule. This typically ranges from 50 to 100 hours of operation for small engines, or annually.
- Cleaning: While some light carbon deposits can be carefully removed, heavily fouled or damaged spark plugs should be replaced.
6. Troubleshooting
If your engine experiences issues after spark plug installation or during operation, consider the following common problems:
- Hard Starting: Could indicate an incorrect spark plug gap, a loose connection, or a fouled plug.
- Engine Misfires/Rough Idling: Often caused by a faulty spark plug, incorrect gap, or issues with the spark plug wire.
- Reduced Power: Worn or fouled spark plugs can lead to inefficient combustion and a loss of engine power.
- Overheating: An improperly torqued spark plug can prevent proper heat transfer, leading to overheating.
If troubleshooting steps do not resolve the issue, consult a qualified service technician or your engine's service manual.
7. Specifications
| Attribute | Value |
|---|---|
| Brand | NGK |
| Model Number | BKR5E (5393) |
| Core Material | Copper |
| Thread Size | 14mm |
| Item Weight | 1.76 ounces |
| Product Dimensions (Packaging) | 5.25 x 2.75 x 0.75 inches |
| UPC | 087295053935 |
8. Safety Information
Working with internal combustion engines and their components requires caution. Always observe the following safety guidelines:
- Never work on a hot engine. Allow it to cool completely.
- Ensure the engine is off and cannot accidentally start.
- Keep hands and tools clear of moving parts.
- Avoid contact with fuel and oil.
- Dispose of old spark plugs and other engine fluids responsibly.
- This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm (Proposition 65 warning). Handle with care and wash hands after use.
9. Warranty and Support
For specific warranty information regarding your NGK PRO-V Small Engine Spark Plug, please refer to the official NGK website or contact NGK customer support directly. Keep your purchase receipt as proof of purchase.
For technical assistance or further inquiries, please visit the NGK Spark Plugs official website.
