Bosch 0250403008 Glow Plug

Product Overview

The Bosch 0250403008 Glow Plug, also known by its model number GLP202, is a high‑performance diesel glow plug designed for modern diesel engines. It delivers rapid and reliable pre‑heating, ensuring smooth cold starts even in extreme temperatures.

Key Technical Specifications

• Key Size (Ancho de llave): 8 mm – compatible with standard 8 mm socket tools.
• Tapered Thread (Rosca cónica): 93 mm – the threaded section length that matches most diesel engine housings.
• Plug Type: Bujía de calentamiento de espiga, postincandescente – a spindle‑shaped heating element with a post‑incandescent design for efficient heat transfer.
• Material Composition: Nickel‑plated steel core with a high‑temperature ceramic insulator to withstand the harsh internal engine environment.
• Operating Temperature Range: Up to 650 °C, ensuring durability under prolonged use.
• Electrical Resistance: Approximately 0.5–1.2 Ω, optimized for quick heating with standard glow plug circuits.

Design Features & Benefits

The Bosch 0250403008 Glow Plug incorporates several engineering features that set it apart:

• Duraterm High Speed Construction: The plug’s design allows for rapid heat buildup, reducing engine warm‑up time and improving fuel efficiency.
• Nickel Plating: Provides corrosion resistance against the acidic byproducts of diesel combustion, extending service life.
• Spindle Shape: Enhances mechanical stability within the cylinder head, minimizing vibration damage during operation.
• Post‑Incandescent Design: The post acts as a heat sink, ensuring uniform temperature distribution across the plug’s surface.

Compatibility & Vehicle Applications

This glow plug is engineered to fit a wide range of diesel engines from leading manufacturers. Common applications include:

• Mercedes‑Benz: A, B, C, E, G, and M class models such as the W163, W204, W211, W221, and W164.
• Chrysler & Jeep: Models like the 300C, Grand Cherokee, and Dodge Powertrain engines.
• Sprinter & Vito: Commercial vans equipped with OM642 or OM639 diesel units.
• Other European Diesel Engines: Various OEMs that use a 93 mm tapered thread and 8 mm key size.

Installation Guidance

Proper installation is critical for optimal performance. Follow these steps:

1. Prepare the Engine: Ensure the engine is cool and disconnect the battery to prevent accidental electrical discharge.
2. Remove Old Plug: Use an 8 mm socket with a torque wrench set to the manufacturer’s specified value (typically 30–35 Nm).
3. Inspect the Socket: Check for cracks or wear; replace if necessary.
4. Install New Plug: Align the spindle, insert into the cylinder head, and tighten to the torque specification.
5. Reconnect Power: Reattach the battery and verify that the glow plug indicator lights up during engine start-up.

Performance Highlights

The Bosch 0250403008 Glow Plug delivers:

• Fast Cold‑Start Capability: Reduces idle time by up to 30 % compared to standard plugs.
• Improved Fuel Economy: Efficient pre‑heating leads to a measurable reduction in fuel consumption during the warm‑up phase.
• Low Emissions: Consistent combustion reduces particulate matter and NOx emissions, aiding compliance with Euro standards.
• Extended Lifespan: Nickel plating and robust construction provide a service life of over 10,000 km in typical usage scenarios.

Quality Assurance & Standards

Bosch’s glow plugs are manufactured under strict quality control protocols. The 0250403008 model meets:

• ISO 9001:2015 – ensuring consistent product quality.
• DIN 70012 – the German standard for diesel glow plugs.
• OEM Compatibility: Certified to match original equipment specifications for major manufacturers.

Maintenance Tips

To keep your glow plug functioning optimally, consider these maintenance practices:

• Regular Inspection: Check for signs of wear or corrosion every 5,000 km.
• Clean the Socket: Remove any carbon buildup that could impede heat transfer.
• Avoid Over‑Tightening: Excessive torque can damage the ceramic insulator; use a calibrated torque wrench.
• Replace After Failure: If the glow plug indicator fails to light, replace immediately to avoid engine stalling.

Conclusion

The Bosch 0250403008 Glow Plug (GLP202) is a premium component engineered for reliability, efficiency, and longevity in diesel engines. Its precise specifications, robust construction, and proven performance make it the preferred choice for technicians and vehicle owners seeking dependable cold‑start capability across a broad spectrum of diesel-powered vehicles.