John Deere Original Equipment Glow Plug RE502079 Instruction Manual

1. Introduction

This manual provides essential information for the proper installation, operation, maintenance, and troubleshooting of the John Deere Original Equipment Glow Plug, part number RE502079. This glow plug is designed to assist in starting diesel engines, particularly in cold weather conditions, by preheating the combustion chamber. Adhering to these instructions will help ensure optimal performance and longevity of the component.

2. Safety Information

Always prioritize safety when working with engine components. Failure to follow safety precautions can result in serious injury or damage to equipment.

• Disconnect Battery: Before performing any work on the engine's electrical system, disconnect the negative battery cable to prevent accidental starting or electrical shock.
• Hot Engine Components: Allow the engine to cool completely before handling glow plugs or other engine parts to avoid burns.
• Eye Protection: Always wear appropriate eye protection to shield against debris or fluids.
• Proper Tools: Use only the correct tools for the job to prevent damage to the glow plug or engine components.
• Flammable Materials: Keep sparks, open flames, and flammable materials away from the engine area.

3. Installation

Proper installation is crucial for the effective operation of the glow plug. If you are unsure about any step, consult a qualified technician.

3.1 Tools Required

• Socket wrench set (typically 10mm or 12mm for glow plugs)
• Torque wrench
• Anti-seize compound (optional, but recommended)
• Wire brush or clean cloth

3.2 Installation Steps

1. Prepare the Engine: Ensure the engine is cool. Disconnect the negative battery cable.
2. Locate Glow Plugs: Identify the glow plugs, typically located on the cylinder head, often near the fuel injectors.
3. Disconnect Wiring: Carefully disconnect the electrical connector from each glow plug. Some systems may have a bus bar connecting multiple plugs; remove this if present.
4. Remove Old Glow Plug: Using the appropriate socket, carefully unscrew and remove the old glow plug. Be gentle to avoid breaking it in the cylinder head.
5. Inspect and Clean: Inspect the glow plug bore for carbon buildup. Clean the area around the bore with a wire brush or clean cloth to ensure a good seal.
6. Apply Anti-Seize (Optional): Apply a small amount of anti-seize compound to the threads of the new glow plug to prevent future seizing.
7. Install New Glow Plug: Hand-thread the new John Deere RE502079 glow plug into the cylinder head to ensure it starts correctly and avoids cross-threading.
8. Torque to Specification: Use a torque wrench to tighten the glow plug to the manufacturer's specified torque. Overtightening can damage the glow plug or cylinder head; undertightening can lead to leaks or poor electrical contact. Refer to your specific engine service manual for exact torque values.
9. Reconnect Wiring: Reconnect the electrical connector(s) to the new glow plug(s). Ensure connections are secure.
10. Reconnect Battery: Reconnect the negative battery cable.

Figure 1: John Deere Original Equipment Glow Plug RE502079. This image displays the glow plug, highlighting its robust construction and electrical connection point, essential for its function in diesel engine starting.

4. Operation

The John Deere RE502079 glow plug functions as an essential component in the cold-starting system of diesel engines. When the ignition key is turned to the 'ON' or 'PREHEAT' position, electrical current flows through the glow plug's heating element. This element rapidly heats up, typically reaching temperatures of 800-1100°C (1472-2012°F), to preheat the air within the engine's combustion chamber. This preheating raises the temperature sufficiently to ignite the atomized diesel fuel when the engine is cranked, facilitating easier and more reliable starting in cold conditions. The glow plug typically remains active for a short period after the engine starts to reduce white smoke and improve combustion stability.

5. Maintenance

Glow plugs are wear items and their performance can degrade over time. Regular inspection and timely replacement are key to maintaining engine starting reliability.

• Inspection: Periodically check the glow plug wiring for any signs of damage, corrosion, or loose connections.
• Testing: If starting issues arise, glow plugs can be tested for continuity and resistance using a multimeter. Consult your engine service manual for specific testing procedures and resistance values.
• Replacement Interval: While there isn't a universal replacement interval, it is generally recommended to replace glow plugs as a set if one fails, as the others may be nearing the end of their service life. Refer to your John Deere equipment's maintenance schedule for specific recommendations.

6. Troubleshooting

If your diesel engine is experiencing starting difficulties, especially in cold weather, glow plugs may be a contributing factor. Here are common symptoms and potential solutions:

7. Specifications

The following specifications pertain to the John Deere Original Equipment Glow Plug RE502079:

• Part Number: RE502079
• Manufacturer: John Deere
• Item Weight: Approximately 3 Pounds (1.36 kg)
• ASIN: B00JPJX0SQ
• First Available: January 23, 2014

8. Warranty and Support

John Deere Original Equipment parts are manufactured to high standards and typically come with a limited warranty. For specific warranty details, including coverage period and terms, please refer to the warranty information provided with your purchase or contact an authorized John Deere dealer. For technical support, service, or to purchase genuine John Deere parts, please visit the official John Deere website or contact your local John Deere dealership.

John Deere Official Website: www.deere.com