In the article, consider the preparation of the block of cylinders, crankshaft and piston to assemble the engine
Not allowed: cracks, bugs, dents, fears, ground crumpledness, damage to the thread of more than two turns, the presence of stars in the teeth of stars of wear and stagnation (visual inspection).
Details, the technical condition of which does not meet the requirements, as well as all sealing parts, auxiliary equipment drive belt, timing chain, timing chain tensioner, timing chain tensioner shoe, timing chain caller, cylinder head gasket, cylinder head bolts, filter camshaft valve, crankshaft pulley attachment bolt, fastening of a graduate collector fixture, exhaust collector fastening studs, oil filter, flywheel fastening bolts, connecting rod cover bolts, crankshaft cover bolts, crankshaft lid bolts, crankshaft bearings , Oil pump drive chain, oil pump chain tensioner is subject to mandatory replacement.
Preparation of a block of cylinders
Classes of diameters of the holes of the crankshaft of the crankshaft are shown in Table 1
The classes of the diameters of the indigenous necks are shown on the cylinder block, Figure 1
The maximum diameter "D" of cylinders, in which the replacement of the cylinder block is required - 78.10 mm.
The measurement of the diameter of the cylinder is made by three belts in the longitudinal and transverse directions, as shown in Figure 2.
The limit size is determined by the most worn cylinder using the Nutromer NE 50-100-1
Using a calibration line and a set of probe, we measure the non-plane of the surface of the cylinder block, conjugate with the head
Measurement We produce as shown in Figure 3
The maximum allowable non-plane surface of the cylinder block mating with a cylinder head is 0.1 mm per 100 mm of length
Check the cylinder block amplifier
Measurements We produce as shown in Figure 4
The maximum non-reduction of the conjugated surfaces of the cylinder block amplifier on the side of the cylinder block and the pallet side of the crankcase 0.1 mm per 100 mm length.
The marking of the dimensional groups of connecting rod and the root necks of the crankshaft is applied on the flange under the installation of the flywheel, Figure 5.
Measurement We produce using a micrometer type MK 75-1
The classes of the diameters of the crankshaft crankshaft necks are shown in Table 2:
The classes of the diameters of the crankshaft of the crankshaft are shown in Table 3
We check the radial beating of the root neck of the crankshaft using a prism, an ICH-10 type indicator, PV-8 tripod
Radial beating should not be more than 0.01 mm
Preparation and inspection of pistons
Squares and cracks of any nature are not allowed on the pistons, progars, the destruction of partitions
The outer diameter D, Figure 5, the piston, measured at a distance L = 10 mm, should be 77.948 - 77.958 mm (micrometer type MK 100-1).
The diameter of the opening of the piston finger should be 19.008 - 19,014 mm (the typemaker type is neither 18-50-1).
Diameter D, Figure 6, Holes under the piston finger in the top head of the connecting rod should be 18,958 - 18,978 mm (Nutrometer of type 18-50-1).
On the diameter of the hole D1 in the lower head, the connecting rods are divided into several classes. The chateter class and the cylinder number are marked on the lid and on the connecting rod housing.
Classes of hole diameters in the lower head of the connecting rodroom are shown in Table 4 (Nutrometer type 18-50-1)
Check the thickness of the lower head rod
The thickness of the lower head of the connecting rod should be in the range of 18.748 - 18,800 mm (micrometer type MK 25-1).
Checking piston fingers
Traces of wear and jackets are not allowed on the piston fingers after expressing (visual inspection).
Check the outer diameter of the piston finger.
The outer diameter of the piston finger should be in the range of 18.996 - 18.998 mm (micrometer type MK 25-1).
Check the length of the piston finger. The length of the piston finger should be in the range of 53.4 mm (CC-1-125-0.1 type calipertercul).
Preparation of the head of the cylinders we reviewed in the previous article