Block Plugs
WARNING: This page is about a different car, the 2002 Jaguar XKR and 2002 Jaguar XK8. However, it is still accessible from the selected car via links, so may be relevant.
Two core plugs are fitted in the rear face of the engine block.
Three flanged, threaded plugs with micro-encapsulated sealant and a sealing washer are fitted, one into the front face of the block behind the water pump, one to the rear face adjacent to the two core plugs and one to the rear of the left hand side.