13641437487 13647509752 Car Engine Seals Fuel Injector O Ring For BMW N20 N26 N55 B58 B48 N63TU

13641437487 13647509752 Engine Fuel Injector O-Ring For BMW N20 N26 N55 B58 B48 N63TU Engines

1. Technical Principle 

Fuel injector O-rings form critical seals between:

• Injector nozzle and cylinder head (preventing combustion chamber leaks)

• Injector body and fuel rail (maintaining high-pressure fuel delivery)

Sealing Challenges Addressed:

• 200+ bar direct injection pressure resistance
•  Thermal stability (-40°C to +150°C) for cold starts/turbo heat
•  Chemical compatibility with gasoline/ethanol blends

2. Product Features

3. Applications

• Prevents:
  ✓ Fuel leaks causing fire hazards
  ✓ Air intrusion leading to lean codes (P0171/P0174)
  ✓ Oil dilution from fuel seepage

• Compatible With:
  ✓ Gasoline/Diesel variants
  ✓ Up to E85 ethanol fuels

4. Manufacturing Process

1. Material Compounding: FKM blended with thermal stabilizers

2. Precision Molding: Computer-controlled injection molding at 180°C

3. Post-Curing: 4-hour oven treatment for molecular alignment

4. QC Testing:

   • 100% pressure testing at 300 bar

   • Dimensional verification via optical comparators

5. Installation Method 

Tools Required:

• O-ring pick tool

• Silicone grease (BMW-approved Glycerin)

Step-by-Step:

1. Clean injector seats with brake cleaner

2. Lubricate new O-rings lightly with grease

3. Install using twisting motion (never stretch)

4. Torque fuel rail bolts to 9 N·m in crisscross pattern

6. FAQ 

Q: How often should O-rings be replaced?
A: Every 60,000 miles or when injectors are serviced

Q: Can I reuse old O-rings?
A: Never - Compression set causes 70% seal failure

Q: Why does my BMW need special FKM material?
A: Standard rubber degrades in direct injection systems within 2 years

Q: Error codes after replacement?
A: Reset adaptations with ISTA/Delphi tool

7.Compatibility Table