Check of a head of the block of cylinders for tightness it is necessary to carry out in a following order. Prepare fixture «11.6.400», consisting of 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 holes in the cooling cavity using a set of tools «11.6.400» (pic. 6.72), using the old block head bolts. Connect to fixture «11.6.406» compressed air source.
Immerse the cylinder head in a bath of water and apply 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.