Prepare the equipment "11.1.477", "11.1.470", "11.1.471", "11.1.473" and "11.1.474". Remove and disassemble the cylinder head. Seal the cooling cavities with the tool "11.1.470".
Place the tools "11.1.477" and "11.1.471" on the sealing surface of the cylinder head and tighten them with the cylinder head mounting bolts.
Install the "11.1.473" tool on the cylinder head, for cylinder heads 1–4 (or the "11.1.473" tool, for cylinder heads 5–8). Connect the compressed air source to the cylinder head (Fig. 4.53).
Immerse the cylinder head in a bath of water, if necessary, you can reduce the water hardness with detergents. Apply a test pressure of 4.5 bar (kgf/cm²) and check the tightness of the cylinder head for cracks in the walls by the appearance of air bubbles.