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AJ86874 - Spark Plug Boss Seal

- €9,70
€9,70
€9,70 - €9,70
€9,70
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OEM Part
OEM: Made by an Original Equipment Manufacturer. This part is made by an original equipment manufacturer or under their license, ensuring compatibility and quality.
Brand Jaguar
Spark Plug Boss Seal seals the spark plug tube recess in the camshaft cover of the 3.5 and 4.2L V8 petrol engine (AJ33 / AJ40).

It prevents engine oil from entering the spark plug wells, keeping the plug bores and ignition coils dry within the cam cover.
Fitment Notes JAGUAR S-TYPE 1999-2008 — V8 (AJ33), from VIN M45255
JAGUAR XF (X250) 2009-2015 — 4.2L V8 Petrol NA/Supercharged
JAGUAR XJ (X350) 2003-2009 — 3.5/4.2L V8 (AJ33), VIN G00442 to H32732
JAGUAR XK (X150) 2006-2014 — 3.5/4.2L V8 (AJ40), from VIN B00379
JAGUAR XK8 (X100) — V8, from VIN A30645
Alternative Codes
AJ86874

Available to order 2–3 weeks

Not currently in stock. Order now — typically ships within 2–3 weeks.

Need it faster? Contact us about express import (2–5 business days).

When will my order arrive?

This item is ordered from our supplier on request. Typical lead time is 2–3 weeks from order confirmation.

  • Netherlands / Belgium / Germany: 2–4 working days after dispatch.
  • Other EU countries + UK: 4–8 working days after dispatch.
  • Outside EU/UK: contact us for an estimate.

Need it faster? Express import available in 2–5 business days — contact us before ordering.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What does the Spark Plug Boss Seal do?
The Spark Plug Boss Seal seals the spark plug tube recess in the camshaft cover of the 3.5 and 4.2L V8 (AJ33/AJ40). It stops engine oil entering the spark plug wells, keeping the plug bores and ignition coils dry.
When should the spark plug boss seals be replaced?
The Spark Plug Boss Seal is typically renewed when oil is found in the spark plug wells, or when the camshaft cover is off for a coil or plug job. Oil pooling around the coils can cause misfires, so fresh seals are fitted as part of that repair.
Which engines and models use this seal?
This Spark Plug Boss Seal fits the Jaguar 3.5/4.2L V8 (AJ33/AJ40) in the S-TYPE (from VIN M45255), XF (X250, 2009-2015), XJ (X350, VIN G00442 to H32732), XK (X150, from VIN B00379) and XK8 (from VIN A30645). Confirm engine and VIN.