11117568263 Rear Crankshaft Oil Seal For BMW Engine Repair Kit OEM

1. Principle

• Function: Prevents engine oil leakage from the rear of the crankshaft (where it exits the engine block).

• Design:

  • Double-lipped fluoroelastomer (FKM) seal for superior heat/oil resistance.

  • Spring-loaded inner lip maintains constant pressure against the crankshaft.

  • Metal outer casing ensures a tight press-fit into the engine block or rear main housing.

2. Purpose

• Critical for:

  • Maintaining proper engine oil pressure.

  • Preventing oil contamination of the clutch/flywheel (in manual transmissions).

  • Avoiding oil leaks that could damage the transmission or exhaust components.

• Common Symptoms of Failure:

  • Oil leaks near the transmission bellhousing.

  • Burning oil smell (if leaking onto hot exhaust).

  • Low oil level warnings without visible top-end leaks.

3. Installation Method

Tools Required:

• Crankshaft locking tool (BMW-specific, e.g., BMW 11 2 300).

• Seal driver kit (appropriate size for the seal diameter).

• Clean lint-free rags and oil-compatible sealant (if specified).

Step-by-Step:

1. Access the Seal:

   • Remove transmission, clutch/flywheel (if manual), or flexplate (if automatic).

   • Clean the crankshaft flange and seal housing thoroughly.

2. Remove Old Seal:

   • Use a seal puller or pry tool (avoid scratching the crankshaft or bore).

3. Install New Seal:

   • Lightly lubricate the seal lip with clean engine oil.

   • Align the seal squarely and drive it in evenly with a seal driver (hammer blows must be centered to prevent distortion).

   • Ensure the seal seats fully against the housing shoulder.

4. Reassembly:

   • Reinstall flywheel/clutch or flexplate with proper torque specs.

   • Refill engine oil if drained.

Torque Specifications (Example):

• Flywheel bolts: 60 Nm + 90° turn (varies by model).

• Crankshaft pulley bolt: Replace (one-time-use, typically 100 Nm + 180°).

Key Notes:

⚠ Critical Tips:

• Never reuse an old seal or install it dry (lubricate the lip!).

• Misalignment during installation causes immediate leaks.

• BMW engines often require timing tools to lock the crankshaft during seal replacement.

Vehicle Compatibility Table

Guangzhou Yuanfenghang Auto Parts Co., Ltd. is a professional manufacturer and wholesaler specializing in high-end automotive parts, focusing on providing genuine and premium aftermarket parts for luxury brands such as Mercedes-Benz, BMW, Land Rover, and Jaguar.

With over 138 employees, the company operates a modern, standard factory covering over 2,000 square meters. The factory boasts three automated production lines, utilizing high-quality equipment for key processes, resulting in an annual production capacity of over 500,000 units.

The company also has a dedicated, professional finished product testing facility, ensuring reliable product data verification. The company is ISO/TS16949 certified. Leveraging years of industry experience and a robust supply chain, the company is committed to providing high-quality, reliable products and services, aiming to become a leading automotive parts supplier in South China.

Adhering to the principles of mutual benefit and integrity, the company offers superior products at competitive prices and excellent service. Yuanfengxing looks forward to working with you to create a better future!