Description

21321-42031 OIL SEAL: Hyundai D4B Series Guide

Timing Case Oil Seal | H100, Starex, Galloper & Bongo

The 21321-42031 OIL SEAL is the essential engine component designed to restore the lubricant integrity of your Hyundai or Kia 2.5L D4B diesel engine. This professionally engineered unit ensures maximum protection against leaks within the timing assembly, providing consistent internal pressure and superior structural integrity.

21321-42031 OIL SEAL Fitment

  • Hyundai H100: 2.5D (D4BA/D4BH)
  • Hyundai Starex / H1: 2.5 Diesel
  • Kia Bongo / K2500: 2.5L Engines
  • Hyundai Galloper: 2.5 TD Models
  • OE Part Number: 21321-42031

Technical Engine Specs

  • Engine Family: 2.5 Diesel (D4B Series)
  • Position: Inner Timing Case
  • Material: Reinforced Polyacrylate
  • Type: Radial Shaft Seal
  • Standard: OE Precision Grade

Reliable Engine Protection

Choosing this specific component is vital for protecting your diesel engine’s timing system. Selecting a premium 21321-42031 OIL SEAL ensures that no oil bypasses the inner cover, preventing premature belt wear. We strongly recommend browsing our Timing Belt Kits to ensure a complete and professional engine service.

Check Fitment Verification

To ensure this part is the perfect fit for your specific chassis, please contact us for professional verification using your chassis number.


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Note: Images shown are for illustration purposes only and may not be an exact representation of the product.

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Questions and Answers

What is the primary function of this 21321-42031 OIL SEAL?
It acts as a specialized sealing unit within the timing gear case, preventing engine oil from leaking onto the timing or balance belts.
Which vehicles are compatible with this part number?
It is designed for the 2.5L D4B series engines (D4BA, D4BB, D4BH) found in the Hyundai H100, Starex, and Kia Bongo.
Can a leak from the 21321-42031 OIL SEAL cause belt failure?
Yes. Oil contamination is a leading cause of belt degradation; replacing this seal prevents the timing belt from slipping or snapping.
Is this component a direct replacement for the original part?
Absolutely. It is manufactured to meet exact OE dimensional tolerances and heat-resistance standards for a perfect fit.
When should this seal be inspected or replaced?
It is a professional best practice to replace the seal during any timing belt replacement or if oil is spotted leaking from the lower timing cover.

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