ELRING 707.640 Nuts And Bolts

ELRING 707.640 Nuts and Bolts

The ELRING 707.640 is a high‑performance cylinder head bolt kit designed for a wide range of automotive engines. It delivers reliable clamping force, precise torque characteristics, and long‑term durability in demanding operating conditions.

Key Features

• Material: High‑strength alloy steel with a phosphated coating for corrosion resistance.
• Tightening Sequence: Engineered to follow the manufacturer’s recommended torque pattern, ensuring even distribution of clamping force.
• Thread Design: M11 x 1.5 mm with a 12‑start thread, providing rapid engagement and reduced risk of cross‑threading.
• Compatibility: Suitable for Ford, Mazda, Eunos, KIA, Haima (FAW), Telstar Mk4 Limousine, Sephia Stufenheck, MX‑5 II, MX‑3, Xedos 6, and many other models.
• Quality Assurance: Meets or exceeds OEM specifications for torque, preload, and material strength.

Technical Specifications

Installation Guidelines

1. Preparation: Clean the cylinder head and block surfaces with a solvent. Inspect bolts for damage or deformation.
2. Alignment: Place each bolt in its designated hole, ensuring proper orientation of the threaded end.
3. Tightening Sequence: Follow the manufacturer’s torque pattern (usually a star or cross pattern). Use a calibrated torque wrench set to the specified values.
4. Final Check: After all bolts are tightened, re‑torque each bolt after 10–15 minutes of engine operation to account for thermal expansion.

Applications and Supported Models

The 707.640 kit is engineered for a broad spectrum of engines across multiple brands:

• Ford: Telstar Mk4 Limousine, Laser, Capri, Bantam, etc.
• Mazda: MX‑5 II (NB), MX‑3, 323 C/F/S, Xedos 6, and other models.
• Eunos & Haima (FAW): Various compact engines.
• KIA & Sephia Stufenheck: Selected inline‑4 and V‑6 engines.
• Other OEMs: The kit is also compatible with certain aftermarket and racing applications where the same thread specifications are required.

Benefits of Choosing ELRING 707.640

• Reliability: Proven track record in both street and high‑performance environments.
• Ease of Installation: Standardized thread size and clear torque specifications simplify the rebuild process.
• Longevity: Heat treatment and corrosion protection extend service life, reducing maintenance intervals.
• Performance: Consistent clamping force maintains head gasket integrity, preventing leaks and overheating.

Maintenance Tips

• Inspect bolts for wear or scoring after every major overhaul.
• Avoid over‑torquing; use a calibrated torque wrench to stay within specified limits.
• If the engine operates in harsh environments (salt, dust), consider additional protective measures such as anti‑rust sprays on exposed threads.

Conclusion

The ELRING 707.640 Nuts and Bolts represent a blend of precision engineering, robust materials, and versatile compatibility. Whether you’re restoring an original vehicle or upgrading a performance engine, this bolt kit delivers the reliability and torque control necessary for optimal head gasket sealing and long‑term engine health.