ELRING 819.956 Nuts And Bolts

ELRING 819.956 Nuts and Bolts

The ELRING 819.956 Nuts and Bolts is a precision‑engineered component set designed for the cylinder head of Mercedes‑Benz and Puch engines. It provides reliable fastening, optimal torque distribution, and long‑term durability under high temperature and pressure conditions.

Key Features

• Exact Fitment: Tailored for the 2.0 L, 4‑cylinder engines found in models such as the W123, S123, C124, and G‑Class (W460/W461/W463).
• High‑Strength Material: Made from hardened alloy steel with a protective coating that resists corrosion and wear.
• Polished Interior Hexagon: The internal hex shape ensures secure engagement with the cylinder head’s threaded holes, preventing slippage during tightening.
• Standardized Torque Sequence: Comes with a recommended torque schedule that guarantees even clamping force across all bolts.
• OEM Quality: Manufactured to original equipment specifications, matching the performance and reliability of factory parts.

Technical Specifications

Compatibility Overview

The ELRING 819.956 set is engineered for a wide range of Mercedes‑Benz and Puch engines, including:

• W123 / S123 / C124 / W124 Series – 2.0 L inline‑4 engines (e.g., 190, 230 E)
• G‑Class (W460/W461/W463) – 2.3 L and 2.5 L variants
• Puch T1 / T2 / G‑Model – 2.0 L to 2.5 L engines used in commercial vehicles
• O 309 Bus Engines – 2.3 L inline‑4 for transit applications

For exact model compatibility, consult the manufacturer’s bolt chart or verify the cylinder head thread size (M8 × 1.25 mm).

Installation Guidelines

1. Preparation: Clean all mating surfaces with a solvent to remove oil, grease, and debris.
2. Alignment: Place the cylinder head onto the engine block, ensuring that the bolt holes align precisely with the threaded studs.
3. Tightening Sequence: Follow the step‑wise torque schedule:
   • First pass: 0.5 Nm (to seat the bolts)
   • Second pass: 1.2 Nm (to establish initial clamping force)
   • Final pass: 2.4 Nm (to achieve full preload)
4. Check for Uniformity: Verify that all bolts reach the same torque value to avoid uneven head gasket sealing.
5. Re‑torque: After engine startup and a brief warm‑up, re‑check torque values to ensure no relaxation has occurred.

Performance Benefits

• Consistent Head Gasket Seal: The precise bolt spacing and torque control maintain gasket integrity under high compression.
• Reduced Vibration: Hardened steel construction minimizes flex, lowering vibration transmission to the engine block.
• Extended Service Life: Corrosion‑resistant coating protects against rust in humid or corrosive environments.
• Improved Engine Reliability: OEM quality ensures that the cylinder head remains securely fastened during operation, reducing the risk of detachment or leakage.

Maintenance & Care

While the bolts themselves require minimal maintenance once installed, proper care of the surrounding components enhances overall longevity:

• Regularly inspect the cylinder head gasket for wear and replace as needed.
• Keep the engine bay clean to prevent moisture accumulation around the bolt threads.
• Avoid over‑torquing during future service; use a calibrated torque wrench set to the specified values.

Conclusion

The ELRING 819.956 Nuts and Bolts represent a critical component for maintaining engine integrity in Mercedes‑Benz and Puch vehicles. With its precise engineering, high‑strength material, and proven compatibility across multiple models, this bolt set delivers reliable performance, ensuring that the cylinder head remains securely fastened under demanding operating conditions.