2.2.1. Check of the block of cylinders
Remove a head of cylinders, a belt of a drive of GRM, the case of the oil pump, a flywheel, pistons and a cranked shaft.
Remove the sensor switch of pressure of oil (fig. 2.20)
Check the block of cylinders on lack of chips, corrosion, scum and rust deposits. Besides, check lack of cracks and other damages. Replace the block of cylinders at detection of major defects.
|Fig. 2.21. Check of the block of cylinders on a buckling
By means of a testing ruler and flat щупа check a buckling of the privalochny plane of the block of cylinders under laying. Before check be convinced that the surface of the block of cylinders is cleared of the remains of old laying and extraneous particles (fig. 2.21)
Nominal rate: 0,03 mm or are less.
Maximum permissible value: 0,15 mm or are less.
|Fig. 2.22. Measurement of diameter of cylinders
Measure diameter of cylinders by means of the indicator-nutromera in three belts on height in the And and To directions (fig. 2.22)
If the nekruglost (ovality) or a cylinder konusnost more maximum permissible value, or on a mirror of the cylinder are available scratches or traces of jamming (tease), cylinders of the block it is necessary to chisel in the corresponding repair size and отхонинговать. After repair of the block of cylinders establish pistons and piston rings of the corresponding repair size.
Nominal diameter of the cylinder: 76,50–76,53 mm.
Maximum permissible konusnost of the cylinder: Or it is less than 0,01 mm.
If on cylinder perimeter at its top part there is a flow (grebnevy wear), remove it by means of the special tool.
Pistons of four repair (increased) sizes are issued.
Repair size and piston label:
0,25 mm – 0,25;
0,50 mm – 0,50;
0,75 mm – 0,75;
1,00 mm – 1,00.
At repair (boring and a honingovka) cylinders in the repair size calculate diameter of boring of the cylinder so that as a result of repair the nominal gap between the piston and the cylinder was provided. Check that all established pistons of one repair size.
Standard measurements of diameter of the piston are made at distance of 47 mm from the piston bottom.
Gap between the piston and the cylinder (the established limit for new details): 0,025–0,045 mm.