"Gazelle" Gas-2705>> The engine>> Engines UMZ-4215S *, УМЗ-42150*>> Head of cylinders
The head is cast from aluminium alloy АК6М2. There are additional racks of fastening of an axis коромысел. On plugs of all valves sealing caps from rubber on a basis фторкаучука are established.

Fig. 4.34. Sequence of an inhaling of nuts of fastening of a head of cylinders

Uniform and dense прилегания heads of cylinders to the block should be made a tightening of nuts of fastening for maintenance on the cold engine in certain sequence (fig. 4.34 see). The inhaling is necessary for conducting динамометрическим a key in two stages: the first — preliminary, with smaller effort; the second — it is definitive, tightening nuts in regular intervals the moment 88,3—93,2 Нм (9,0—9,4 кгсм).
After a tightening of nuts of fastening thermal backlashes between valves and коромыслами are necessarily checked.