- Make external survey of the block about identification of traces of corrosion, cracks and other damages. Check a condition of a carving of boltovy openings. It will be reasonable to make also testing of the block for existence of the hidden cracks in the conditions of a car-care center workshop with use of the special diagnostic equipment. In case of detection of defects the block is subject to regenerative repair or replacement.
- Check a condition of mirrors of cylinders.
- Estimate sizes taking place a konusnost and ovality of cylinders:
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- Measure diameter of each of cylinders in top (directly under limit of step wear), the central and bottom sections in the plane of a parallel axis of a cranked shaft;
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- Now measure diameters at the same three levels, but in the plane, a perpendicular axis of the block;
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- The size of a konusnost of the cylinder is defined by a difference between results of measurements in the top and bottom sections. The difference of diameters in a parallel and perpendicular axis of a cranked shaft in each of the planes is called as ovality;
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- Operating in the described manner, serially check all cylinders.
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- Standard diameters of cylinders can have insignificant disorder for the purpose of which compensation pistons of several standard dimensional groups are issued — number of group is beaten out on a block surface near each cylinder, and also on the piston bottom, behind a forward label.
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- At installation of pistons of the standard size track compliance of their dimensional groups to dimensional groups of the corresponding cylinders. At installation of shatunny assemblies pistons should appear are developed by forward labels on the bottoms forward on the engine.
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- At detection of appreciable defects or a deviation of results of measurements from standard requirements, the block of cylinders is subject to regenerative machining in the conditions of a car-care center workshop. If in the course of regenerative repair boring of cylinders was made, the engine should be completed with new pistons corresponding repair (with excess) the size.
- If the condition of mirrors of cylinders during performance of check is found satisfactory at simultaneous observance of standard requirements to a form of cylinders and gaps of landing of pistons in them (see.
Check of a condition of components of shatunno-piston group), need for a pro-point of cylinders disappears. Will execute only honingovany their mirrors (see Honingovaniye of mirrors of cylinders) enough.
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- Check planeness of a surface of the block interfaced to a head (measurement should be made in three directions: on an axis of the block and its two diagonals. Compare result of measurements to requirements
of Specifications, in case of need give the block to a pro-point.
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