BMW N20 N46 N51 N52 N53 N54 N55 11117511396 Engine Rear Crankshaft Oil Seal With Best Value

Technical Principle

The Engine Rear Crankshaft Oil Seal is a critical sealing component installed at the rear end of the crankshaft, where it connects to the transmission. Its primary function is to prevent engine oil leakage from the crankcase while keeping contaminants (dust, dirt, moisture) out. It ensures proper lubrication of the crankshaft and maintains engine oil pressure.

Constructed from high-grade materials such as nitrile rubber (NBR), fluoroelastomer (FKM), or PTFE, the seal features a spring-loaded lip design that maintains constant contact with the crankshaft, ensuring a tight seal even under high rotational speeds and temperature variations.

Key Features

1. Premium Material – Made from heat-resistant, oil-resistant rubber or synthetic compounds for durability.
2. Precision Engineering – Exact OEM specifications for a perfect fit (BMW part number 11117511396).
3. Enhanced Sealing Lip – Reinforced with a garter spring to prevent oil leaks under high pressure.
4. Wear Resistance – Long service life, reducing the need for frequent replacements.
5. Temperature Tolerance – Withstands extreme engine operating temperatures (-40°C to +200°C).

Compatibility Chart

Notes:

1. Engine Codes:

   • N46/N52/N53: Naturally aspirated inline-4/inline-6 engines.

   • N54/N55: Turbocharged inline-6 engines.

   • N20: Turbocharged inline-4 engine.

2. Verification Required:

   • Always cross-check your vehicle’s VIN (Vehicle Identification Number) or consult BMW’s official parts catalog for 100% compatibility.

3. Other Models:

   • May also fit select E84 X1 or F25 X3 models with compatible engines (confirm with mechanic).

Manufacturing Process

1. Material Selection – High-quality rubber or synthetic polymers are chosen based on OEM standards.

2. Molding & Vulcanization – The seal is formed using precision molds and cured under controlled heat.

3. Spring Integration – A stainless steel garter spring is embedded to enhance sealing pressure.

4. Quality Inspection – Each seal undergoes leakage tests, dimensional checks, and durability assessments.

5. Packaging – Seals are packed to prevent deformation or damage during shipping.

Installation Method

Tools Required:

• Seal removal tool or screwdriver

• Socket wrench set

• Lubricating oil or grease

• Torque wrench

Steps:

1. Disassemble Transmission & Flywheel – Gain access to the rear crankshaft area.

2. Remove Old Seal – Carefully pry out the worn seal without damaging the crankshaft surface.

3. Clean the Housing – Remove debris and old sealant residue.

4. Lubricate New Seal – Apply engine oil or grease to the sealing lip.

5. Install New Seal – Press it evenly into place using a seal driver or suitable tool.

6. Reassemble Components – Reinstall the flywheel, transmission, and related parts.

7. Check for Leaks – Start the engine and inspect for oil seepage.

FAQ (Frequently Asked Questions)

Q1: How do I know if my rear crankshaft oil seal is failing?
Symptoms:

• Oil leaks near the transmission bell housing

• Low engine oil levels without visible external leaks

• Burning oil smell due to leakage onto hot components

Q2: Can I replace the rear crankshaft seal without removing the transmission?
Answer: In most BMW models, the transmission must be detached to access the seal. Some vehicles may allow access by only removing the flywheel.

Q3: What happens if I don’t replace a leaking rear crankshaft seal?
Risks:

• Severe oil loss → Engine damage due to insufficient lubrication

• Contamination of the clutch (in manual transmissions)

• Potential failure of other engine components

Q4: How long does a rear crankshaft oil seal last?
Lifespan: Typically 80,000–150,000 miles, but depends on driving conditions, oil quality, and maintenance

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