3.2. Head of the block of cylinders
Fig. 3.2. Head of the block of cylinders
The head of the block (fig. 3.2)
consists of two sections which are cast from aluminum alloy. In the lower section of a head of the block the valvate mechanism
and beds of cam-shafts is placed. The top section of a head of the block performs function of a valvate cover and reciprocal part of beds of cam-shafts. The oil channels cast in the lower part of the top section provide supply of oil to camshafts and hydropushers.
Each camshaft leans on five bearings formed by two sections of a head of the block.
The head of the block has hemispherical combustion chambers and a V-shaped arrangement of valves. From above the head of the block is covered with a flat cover.
As consolidation between a head of the block and the block of the cylinder serves metalasbestos laying, and in connection between the top and lower sections of a head of the block the polymerized pro-masonry mastic is used.
Block head height — 128,95 — 129,05 mm.
Fig. 3.3. Admissible indicators of not planeness of a head of the block of cylinders
Admissible not planeness of a head of cylinders on the socket a block block/head: longitudinal — 0,50 mm; cross — 0,20 mm. The maximum admissible processing of the plane of the socket the head/block on a block head — 0,30 mm. Machining of a head of the block is allowed if not planeness of a head of the block is in limits of norm (fig. 3.3)