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2.4.5.3. Check of a head of the block of cylinders on a buckling

Fig. 2.263. Check of a head of the block of cylinders


Precision ruler and the flat probe, as shown in the figure 2.263, check a buckling of working surfaces of a head of the block of the cylinders interfaced to the surface of the block of cylinders and to surfaces of inlet and final collectors.
The most admissible buckling of a surface:
the block of cylinders – 0,05 mm;
collectors – 0,08 mm.

Fig. 2.264. Use of dye when checking the block of cylinders


If the size of a buckling exceeds the most admissible, replace a head of the block of cylinders or grind it. Using the getting dye, check existence of cracks in combustion chambers, inlet and final channels and for surfaces of a gas joint (fig. 2.264).
In the presence of cracks replace a head of the block of cylinders or make it (with the subsequent grinding). Tea leaves of cracks of a head of the block of cylinders have to be produced in specialized workshops. Clear valves, for this purpose a shaber remove a raid of carbonaceous deposits from a plate of the valve then a brush finally clear the valve.

Fig. 2.265. Measurement nutrometry the internal diameter of the directing plugs of valves


Check diameters of cores of valves and internal diameters of the directing plugs of valves, for this purpose measure by a nutromer the internal diameter of the directing plugs of valves (fig. 2.265).
Internal diameter of the plug:
1MZ-FE – 5,510–5,530 mm.

Fig. 2.266. Measurement of diameter of a core of the valve micrometer


Also measure by a micrometer diameter of a core of the valve (fig. 2.266).
Diameter of a core of the valve:
the inlet valve – 5,470–5,485 mm;
the final valve – 5,465–5,480 mm.
On a difference of measurements of diameter of a core of the valve and internal diameter of the directing plug find a gap between a core of the valve and its guide.
Standard oil gap:
the inlet valve – 0,025–0,060 mm;
the final valve – 0,030–0,065 mm.
Maximum oil gap:
the inlet valve – 0,08 mm;
final – 0,10 mm.
If the gap is more than most admissible, replace the valve and the directing plug.