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Checking the technical condition and repair the cylinder
Before checking the technical condition of the cylinder block must be thoroughly cleaned of dirt and oil. The taper of the cylinder bore gauge is checked using several zones: - Engine type GA at 20 and 100 mm from the upper surface of the block; - Engine type SR at 10, 60 and 100 mm from the upper surface of the block. The difference in size should not exceed 0.01 mm. Ovality cylinder is measured at two points at a distance of 60 mm from the upper surface of the block in two mutually perpendicular axes. The difference between the measured diameters should not exceed 0.015 mm.
NOTES When repairing the cylinder should be taken into account the following requirements. Permissible surface flatness coupling unit with the cylinder head is 0.1 mm. When sanding the surface interface unit with cylinder head allowed the removal of the metal does not exceed 0.2 mm. Permitted roundness of cylinders not exceeding 0,015 mm. Permissible taper cylinders of not more than 0.01 mm. The maximum allowable wear on the cylinders in operation 0.2 mm. The difference of diameters of two cylinders: nominal 0.05 mm, 0.20 mm maximum allowable. |
The allowable increase in the bore diameter of the cylinder is determined by the following method: piston diameter + clearance between piston and cylinder bore (0,015-0,035 mm) - allowance for honing (0.02 mm). If one cylinder requires boring, it is necessary to chisel and all other cylinders. In case of exceeding the specified tolerances are closest to chisel cylinders under the repair size and choose the appropriate diameter pistons. Before you install the cover bore the crankshaft bearing to improve the stiffness of the block of cylinders and tighten bolts of fastening of the set moment. Bore perform several passes, taking not more than 0.06 mm in a single pass of the metal. After sanding and carefully clean the bore of the cylinder channels for oil and coolant. Check the flatness coupling block with the cylinder head.
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