Core Plug for Defender (1986 – 2006) – 524765

Thomas Performance Ltd Verified independent store

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A core plug, also known as a freeze plug or expansion plug, seals the casting holes left in the engine block during manufacture on Land Rover's 2.5 and 3.5/3.9-litre engines. These pressed-steel or brass discs are designed to expand and seal against coolant pressure, but corrosion from degraded antifreeze or electrolytic action can cause them to fail, resulting in coolant loss and potential overheating. Prompt replacement prevents further engine damage from coolant leakage into the bay or oil system. Key Features Pressed steel construction engineered to seal engine block casting apertures against coolant pressure Requires removal of adjacent components for access depending on plug location - inspect all plugs during replacement Meets OEM fitment specifications for Land Rover petrol and diesel engines of the applicable period Multiple core plugs are used per engine block - replace adjacent plugs simultaneously if corrosion is present Vehicle Fitment Fits Defender (1986–2006), Discovery 1 (1989–1998), and Range Rover Classic engine applications. Not sure about fitment? Feel free to get in touch at [email protected] Show more