URO NCA2578BB Spark Plug Tube Seal
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URO NCA2578BB Spark Plug Tube Seal

Brand URO NCA2578BB
Fits Jaguar · 5 vehicles

OE-style seal profile. Proper compression seal between valve cover and head.

Heat-resistant gasket material. Stands up to engine heat and oil degradation.

Replaces hardened or cracking seals that can cause vacuum leaks.

Cross-references URO NCA2578BB, 225 26028 613 and URO-009957 for the same application. See all 3.

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Spark Plug Tube Seal for Jaguar V8 Engines

This URO spark plug tube seal helps restore the seal between the valve cover and cylinder head on select Jaguar Vanden Plas, XJ8, XJR, and XK8 models. It addresses oil intrusion around the spark plug well that can lead to ignition issues and reduced engine performance.

  • OE-style seal profile and durometer for proper compression
  • Resists engine heat and oil exposure
  • Replaces hardened or cracking spark plug tube seals
  • Helps maintain a tight seal at the valve cover and head interface
  • URO part number NCA2578BB for direct replacement lookup

Detailed Fitment and Function

Built for secondary ignition service, this seal is used where the spark plug boss meets the cam cover on compatible Jaguar applications. It is a direct-fit replacement for the URO NCA2578BB and is cross-referenced to 225 26028 613 and URO-009957 for the same application. Fits 1997 Jaguar XK8, N/A, and fits 1998 Jaguar Vanden Plas, N/A; fits 1998 Jaguar XJ8, N/A; fits 1998 Jaguar XJR, N/A; fits 1998 Jaguar XK8, N/A. This part number, NCA2578BB, is intended for engines with the listed fitment notes and engine range limits shown in the catalog data.

What It Helps Fix

  • Oil buildup in the spark plug tube
  • Misfire caused by contamination around the spark plug and ignition wire connector
  • Vacuum leaks from hardened or cracked seals
  • Loss of engine performance from poor sealing at the valve cover
  • Heat- and oil-related seal deterioration

Installation Notes

Inspect the valve cover, spark plug boss, and surrounding sealing surfaces before installation. Clean away oil residue and debris so the new seal can compress evenly. Verify engine range and model-specific notes before ordering, especially on 1998 Jaguar Vanden Plas, XJ8, XJR, and XK8 applications.

Quality Assurance

URO lists this seal with a 24 Month Unlimited Mileage Warranty. The gasket material is specified to resist engine heat and oil degradation for long-term sealing performance.

Related reading

This part fits 5 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
1998JaguarVanden PlasN/A2 per head, 4 per engine; Spark plug boss to cam cover; Engine Range to 981020000
1998JaguarXJ8N/A2 per head, 4 per engine; Spark plug boss to cam cover; Engine Range to 981020000
1998JaguarXJRN/A2 per head, 4 per engine; Spark plug boss to cam cover; Engine Range to 981020000
1998JaguarXK8N/A2 per head, 4 per engine; Spark plug boss to cam cover; Engine Range to 980324000
1997JaguarXK8N/A2 per head, 4 per engine; Spark plug boss to cam cover
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
URO — NCA2578BB225 26028 613URO-009957