NGK Glow Plug - 5939

NGK Glow Plugs Part Number: 5939 Manufacturer: NGK Part Number: 5939, Trade No: Y-522J Thread Size...

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Product Information

Full details

The NGK Glow Plug (Part Number 5939) is designed for diesel engine owners seeking reliable starting performance, especially in cold weather. Its key benefit is ensuring safe start-up and stable idling during warm-up, contributing to lower emissions. However, it's crucial to verify fitment for your specific vehicle before purchasing, as this is a single component and often sold in sets.

All features

Model Part Number	5939
Brand	Blue Print

Extended Product Information

FAQs

How many glow plugs do I need for my vehicle?

Most diesel engines require multiple glow plugs, typically one per cylinder. Please check your vehicle's specifications or consult a mechanic to determine the exact number needed. This listing is for a single glow plug.

What is the primary function of a glow plug?

A glow plug is a heating device used in diesel engines to pre-heat the combustion chamber. This ensures the diesel fuel ignites properly, especially during cold weather, facilitating easier engine starts.

How do I know if my glow plugs need replacing?

Common symptoms include difficulty starting the engine (especially when cold), rough idling, increased exhaust smoke during startup, and the glow plug indicator light staying on longer than usual or not illuminating at all.

Can I use these glow plugs in a gasoline engine?

No, glow plugs are specifically designed for diesel engines. Gasoline engines use spark plugs for ignition.

What does 'M10 x 1.25mm' thread size mean?

This refers to the metric thread specification. 'M10' indicates a nominal diameter of 10mm, and '1.25mm' is the pitch, meaning the distance between the threads.

What is the significance of the 'Resistance' value?

The resistance (1.4 Ohm) indicates the electrical opposition within the glow plug's heating element. This value is important for the engine control unit to manage the heating cycle correctly.

What is the overall length and fitting depth?

The overall length is 212mm, and the fitting depth is 23mm. These measurements are crucial for ensuring the glow plug seats correctly within the cylinder head's pre-combustion chamber.

Troubleshooting

Engine fails to start in cold weather

Check all glow plugs for continuity and resistance. Ensure the glow plug relay and timer are functioning correctly. Verify battery voltage.

Rough idling or engine stalling during warm-up

Inspect glow plugs for signs of damage or fouling. Test their heating element resistance. Ensure all glow plugs in the set are functioning equally.

Glow plug indicator light malfunction

Check the glow plug control module or timer unit for faults. Inspect wiring connections to the glow plugs and the control module.

Difficulty removing old glow plug

Apply a penetrating oil and allow it to soak. Ensure the engine is slightly warm (not hot) to aid removal. Use a steady, even force to avoid breaking the plug.

Pros and Cons

Pros

Ensures reliable cold starts for diesel engines.
Helps meet emission standards by reducing pollutants during warm-up.
Promotes engine stability and smooth idling.
Built with trusted NGK technology for durability.
Designed for a specific thread size (M10 x 1.25mm) for proper fitment.

Cons

This listing is for a single glow plug; multiple may be required.
Requires careful verification of vehicle compatibility before purchase.
Not suitable for gasoline engines.
Installation may require specialized tools and mechanical knowledge.

Setup, Compatibility & Care

Compatibility Verification:

Before installation, it is essential to confirm that the NGK Glow Plug 5939 is compatible with your specific vehicle's make, model, and engine specifications. Use the provided make and model tool or consult your vehicle's service manual. Cross-reference part numbers (like DACIA 7701058142, INFINITI 11065DB000, NISSAN 11065DB000, RENAULT 7701058142) to ensure a match.

Installation:

Installation should ideally be performed by a qualified mechanic. The glow plug has a specific thread size (M10 x 1.25mm) and requires a 12mm spanner for fitting. Overtightening can damage the cylinder head, while undertightening can lead to poor performance or leaks. Ensure the fitting depth (23mm) is correctly accommodated.

Care:

Glow plugs are generally maintenance-free components. However, if you experience starting issues, it's recommended to have them inspected. Regular maintenance of your diesel engine, including fuel system checks and air filter replacement, indirectly supports the optimal performance of glow plugs.