Checking the engine cylinder head for leaks must be carried out in the following order.
Prepare fixtures «11.9.430», «11.9.431», «11.9.432» And «11.9.433» to work. Remove and disassemble the cylinder head. Apply fixtures «11.9.431» on the sealing surface of the cylinder head and bolt them (fixture «11.9.433)» to the cylinder head.
Plug the hole in the cooling cavity with a tool «11.9.432», and tighten it. Connect hose (1, fig. 5.62) compressed air source with pressure gauge to the cylinder head.
Immerse the cylinder head in a bath of water, if necessary, reduce its hardness with detergents. Apply test pressure 4.5 bar (kgf/cm2), and check the tightness of the cylinder head for cracks in the walls, by the appearance of air bubbles.