Description
21443-4A001 OIL SEAL: Hyundai-Kia D4CB Guide
Rear Crankshaft Main Seal | H1, Starex, Porter II & Sorento CRDi
The 21443-4A001 OIL SEAL is the essential engine component designed to restore the lubricant integrity of your Hyundai or Kia 2.5L CRDi engine. This professionally engineered seal ensures maximum protection against oil leaks at the rear of the block, consistent crankcase pressure, and superior structural integrity under the extreme thermal cycles of a turbocharged diesel powertrain. This component is critical for maintaining the professional performance of your vehicle’s original engine configuration.
21443-4A001 OIL SEAL Fitment
- Hyundai H1 / Starex: 2.5L D4CB Diesel
- Hyundai Porter II: 2.5L CRDi Models
- Kia Sorento (BL): 2.5L Diesel Series
- Kia Bongo III: 2.5L PU Diesel
- OE Part Number: 21443-4A001
Technical Engine Specs
- Engine Family: A-Series (D4CB)
- Position: Rear Main (Transmission Side)
- Material: High-Grade PTFE / FKM Compound
- Design: Heavy-Duty Lip Sealing Technology
- Standard: OE Diesel Pressure Tolerance
Benefits for High-Torque Sealing
Choosing this specific sealing unit is vital for the long-term health of your vehicle’s drivetrain and clutch assembly. Because the D4CB engine produces significant vibration and torque, selecting a premium seal ensures that engine oil does not contaminate the Clutch Kits or Dual-Mass Flywheels, which could lead to slipping. Proper fitment is key; therefore, we strongly recommend browsing our Premium Diesel Engine Oils to maintain seal elasticity.
Furthermore, to maximize the lifespan of your powertrain, you may also consider inspecting our Diesel Oil Filters. Vehicle longevity often depends on the perfect harmony between oil pressure and external sealing. While replacing your rear main seal, it is professional practice to verify the condition of the crankshaft rear flange.
The 2.5L D4CB engine has minor crankshaft flange updates between early Euro 3 and later Euro 5/6 versions. To ensure the 21443-4A001 OIL SEAL is the perfect fit for your specific vehicle, please contact us for professional verification using your chassis number.
Note: Images shown are for illustration purposes only and may not be an exact representation of the product.














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