Timken 231003 Engine Crankshaft Seal - Front or Rear

Timken Engine Crankshaft Seal Overview

The Timken 231003 engine crankshaft seal is designed for precise fitment and reliable sealing in various BMW models. Crafted from durable S-nitrile material, this seal ensures effective protection against oil leaks and contaminants for engines in vehicles like the BMW 530i, 740i, and M5.

• Material: S-nitrile for enhanced resistance to heat and oil
• Outside Diameter: 125.35 mm (4.935 inches)
• Shaft Diameter: 100.00 mm (3.937 inches)
• Housing Bore: 125.00 mm (4.921 inches)
• Seal Type: 35, designed for crankshaft sealing applications
• Width: 12.00 mm (0.472 inches)

Technical Details and Specifications

The Timken 231003 crankshaft seal features a precise outside diameter of 125.35 mm and a shaft diameter of 100.00 mm, ensuring a secure fit within the housing bore of 125.00 mm. The seal’s 12 mm width provides a robust barrier against oil leakage, while the S-nitrile material offers excellent resistance to engine heat, oil, and wear. This seal type 35 is engineered specifically for crankshaft sealing, maintaining engine integrity and performance in BMW models such as the 645Ci, 750iL, and X5.

Compatible BMW Models and Applications

This Timken crankshaft seal 231003 is compatible with a wide range of BMW vehicles, including but not limited to the 530i, 540i, 545i, 550i, 645Ci, 650i, 740i, 740iL, 745i, 745Li, 750i, 750iL, 750Li, 760i, 760Li, 840Ci, 850Ci, 850CSi, 850i, M3, M5, M6, X5, X6, and Z8. It is designed to replace worn or damaged crankshaft seals to maintain proper engine sealing and prevent oil leaks.

Common Issues Addressed by This Crankshaft Seal

• Prevents oil leaks around the crankshaft area
• Reduces contamination ingress into the engine
• Maintains engine oil pressure and performance
• Prevents premature wear of engine components
• Helps avoid costly engine repairs due to seal failure

Installation Notes and Tips

When installing the Timken 231003 crankshaft seal, ensure the sealing surface and housing bore are clean and free of debris. Use appropriate tools to avoid damaging the seal during installation. Verify the seal orientation matches the engine specifications for optimal performance. It is recommended to inspect the crankshaft and surrounding components for wear before installation.

Quality Assurance and Warranty

Timken manufactures the 231003 crankshaft seal to meet strict quality standards, ensuring durability and reliable sealing performance. The S-nitrile material is selected for its resistance to heat and oil degradation. While specific warranty details may vary, Timken products typically come with a limited warranty against manufacturing defects, providing confidence in the product’s longevity and function.