Fig. 2.345. Planes of measurement of conrod and radical necks

Measure by a micrometer diameter of each conrod and radical neck in two mutually perpendicular planes, as shown in the figure 2.345.

Diameter of a radical neck:

standard – 60,988–61,000 mm.

Diameter of a conrod neck:

standard – 52,992–53,000 mm.

If values of diameters go beyond the specified limits, check oil gaps. If necessary to a pereshlifuyta or replace a bent shaft.

Fig. 2.346. Installation of the lower persistent half rings of the bearing No. 2

Clear each radical neck and inserts. Check the surface of each radical neck and inserts for existence of pointed corrosion and scratches. If the neck or an insert are injured, replace inserts. If necessary to a pereshlifuyta or replace a bent shaft. Establish the lower persistent half rings on a cover of the radical bearing No. 2, having focused lubricant flutes outside, as shown in the figure 2.346.

Fig. 2.347. Installation of plastic caliber: 1 – caliber

Lay a bent shaft in the block of cylinders. Put plastic caliber for measurement of gaps in sliding bearings on each radical neck (fig. 2.347).

Fig. 2.348. Installation of radical bearings

Install bearings (fig. 2.348).

Fig. 2.349. Gap size between a cover of the radical bearing and the socket of the block of cylinders

Apply a layer of engine oil on a carving and under heads of bolts (with a 12-faced head). Temporarily establish eight bolts of fastening of covers of the bearing. Using bolts as guides, insert a bearing cover so that the gap between it and the socket of the block of cylinders made less than 6 mm (fig. 2.349).

Fig. 2.350. Additive of covers of radical bearings

Using the hammer with plastic brisk, besiege covers of bearings so that they densely adjoined (fig. 2.350).

Fig. 2.351. Order of tightening of bolts of covers of radical bearings

Apply a thin film of engine oil on carvings and under heads of bolts of fastening of covers of radical bearings (with a 12-faced head) and establish them. Establish and evenly tighten sixteen bolts of covers of radical bearings in several passes to the sequences, shown in the figure 2.351.

If at an inhaling of any bolt the required inhaling moment is not reached, replace a bolt.

Fig. 2.352. The correct provision of a tag when tightening bolts of a head of the block of cylinders

Apply tags with paint on a forward part of bolts of a head of the block of cylinders. Tighten bolts of a head of the block of cylinders on 90 ° in the sequence stated above. Check that the tag put with paint costs on 90 ° from initial situation (fig. 2.352).

Fig. 2.353. Sequence of tightening of bolts of fastening of covers of radical bearings

Establish old sealing washers on coupling bolts of fastening of covers of radical bearings. Establish and evenly tighten coupling bolts of fastening of covers of radical bearings in several passes the moment of an inhaling of 27 N · m in the sequence shown in the figure 2.353.

Fig. 2.354. The plastic caliber showing the size of a radial oil gap

Uncover radical bearings as it was stated above. Measure the maximum width of the flattened plastic caliber, having determined by it the size of a radial oil gap (fig. 2.354).

Oil gap:

radical bearings No. 1 and No. 4 –

standard – 0,014–0,036 mm;

maximum – 0,05 mm;

radical bearings No. 2 and No. 3 –

standard – 0,026–0,048 mm;

maximum – 0,06 mm.

If the oil gap is more than maximum, replace bearings. If it is necessary, to a pereshlifuyta or replace a bent shaft.

When replacing inserts of the nominal size it is necessary to use inserts of one dimensional group. If number of dimensional group of inserts cannot be defined, choose the necessary insert according to the table, by folding of number of dimensional group of the block of cylinders with number of dimensional group of a bent shaft.

Fig. 2.355. Location of number markings: 1 – number markings

There are five standard dimensional groups of inserts, designated "3", "4", "5", "6" and "7" (necks No. 1 and No. 4), "1", "2", "3", "4", "5" (necks No. 2 and No. 3) respectively (fig. 2.355).