Checking the cylinder head for leaks (BMW X5 E53)

The cylinder head leak test must be performed in the following order. Prepare the "11.6.400" device, consisting of the following devices: "11.6.401"; "11.6.402"; "11.6.403"; "11.6.404"; "11.6.406"; "11.6.407" and "11.6.408".

Disassemble the cylinder head and plug the cooling cavity holes using the "11.6.400" tool kit (Fig. 6.72), using the old cylinder head mounting bolts. Connect a compressed air source to the "11.6.406" tool.



Immerse the cylinder head in a water bath and create a test pressure of 4.5 bar (4.5 kgf/cm²). Check the cylinder head for cracks in the walls by the appearance of air bubbles. If cracks are found, replace the head.

(The original source of the article is on the website «BMWMan»)