2.2.27. Check of radical bearings

In spare parts radical bearings nominal are delivered and increased (on 0,25 mm) the size, everyone has 5 types differing according to the admission.

Fig. 2.169. Inserts of radical bearings of a bent shaft

The top half of the bearing (insert) 1 has a lubricant flute 2, as shown in the drawing. 2.169.

This insert with a lubricant flute is established in the block of cylinders.

The lower insert of the bearing has no lubricant flute.

Check bearings for existence of pointed corrosion, scratches, wear or damages. At detection of defect replace both inserts. Never replace inserts separately.

Fig. 2.170. Laying of a piece of the calibrated plastic wire on the surface of a radical neck

Check a gap the calibrated plastic wire in the following order.

Uncover bearings.

Clear bearings and radical necks of a bent shaft.

Put a piece of the calibrated plastic wire 1 on the surface of a radical neck (parallel to a bent shaft) so that it did not close the oil channel.

Gradually tighten bolts of a cover of the bearing No. 1 1-10 and a cover of the bearing No. 2 11-20 as follows.

Fig. 2.166. Order of tightening of bolts of fastening of covers of bearings No. 1 and No. 2

and. Tighten bolts 1–10 moment of 30 N · m in the order specified in the figure 2.166.

b. In the same way, as well as when performing operation a), tighten their moment 50 N · m.

c. In the same way, as well as when performing operation a), tighten them for 60 °.

d. Tighten bolts 11–20 moment of 22 N · m in the order specified in the figure 2.166.

Bolt of fastening of a cover of the radical bearing of a bent shaft No. 1 (1-10): tighten the moment 30 N · m, 50 N · also tighten m on 60 °

Bolt of fastening of a cover of the radical bearing of a bent shaft No. 2 (11-20): tighten the moment 22 N · m.

NOTE Do not rotate a bent shaft during measurement of gaps.

Uncover and determine gap size by flattening of the calibrated plastic wire 2 in the widest place, using a scale 1 on packing of the calibrated plastic wire.

Fig. 2.171. Measurement of the flattened piece of the calibrated plastic wire

If the gap exceeds its extreme value, replace the bearing. Always replace both inserts. The new bearing of the nominal size can provide a necessary gap. Otherwise, it will be necessary to proshlifovat a neck of a bent shaft and to use the bearing of thickness increased by 0,25 mm.

After selection of the new bearing check a gap again.

Nominal rate: 0,025–0,045 mm.

Extreme value: 0,065 mm.

NOTE After check of a gap in the bearing, make sure that deformation of bolts of a cover of the bearing No. 1 does not exceed extreme value.

If the bearing is in an unsatisfactory state or the gap in the bearing – differs from norm, pick up and install the new bearing of the nominal size as follows.

Fig. 2.172. Marking of the radical bearing of a bent shaft

At first measure diameter of a neck of a shaft. As shown in the figure 2.172, on a cheek No. 2 of a bent shaft numbers are beaten out. There are three versions of numbers ("1", "2" and "3") which do not correspond to the following diameters of a neck of a shaft. Number on a neck of a bent shaft corresponds to diameter of a neck of a shaft designated by an arrow in the drawing. For example (M13 engine), No. "1" corresponds to diameter of a neck of a shaft – 44,9940–45,0000 mm.

Fig. 2.173. Marking of diameters of openings under radical bearings

Then, check diameter of an opening under the radical bearing. On the interfaced surface of the block of cylinders five letters, as shown in the figure 2.173 are beaten out. Three letters ("A", "B" and "C") correspond to the following diameters of an opening under the radical bearing. The letters on the block of cylinders specified in the drawing by an arrow correspond to diameter of an opening under radical the bearing.

For example (M13 engine), the letter "A" specifies that the corresponding diameter of an opening under the radical bearing makes 49,000–49,006 mm.

Fig. 2.153. Color marking of inserts of conrod bearings: 1 – color marking

There are 5 classes of bearings of the nominal size differing on thickness. For difference they have color marking in the places shown in the figure 2.153.

Every color corresponds to a certain thickness of the central part of the bearing.

According to number on a cheek of a bent shaft No. 2 and a letter on the block of cylinders pick up the new bearing of the nominal size for the table given below. For example (M13 engine) if number on a cheek of a bent shaft No. 2 – "1", and a letter on the block of cylinders - "B", install the new radical bearing of the nominal size with violet color marking.

Measure a gap of the radical bearing for the picked-up bearing of the nominal size.

If gap size still exceeds extreme value, install the bearing of the increased thickness and again check a gap.

When replacing a bent shaft or the block of cylinders assembled for any reason, pick up new bearings of the nominal size for No. at on new cranked to a shaft or letters on the new block of cylinders.

The bearing of the increased thickness (0,25 mm).

The bearings of thickness increased by 0,25 mm delivered in spare parts are divided into five classes depending on thickness.

Fig. 2.174. Color markings of inserts of radical bearings: 1 – color markings

For difference each bearing has the following color marking in the place shown in the figure 2.174.

Each color marking corresponds to bearing thickness in the central part.

In case of need, a proshlifuyta a neck of a bent shaft also pick up the bearing of the increased thickness, as follows.

and. Proshlifuyte a radical neck of a bent shaft to the following repair size.

Repair size of a neck of a shaft:

– for the M13 engine: 44,732–44,750 mm.

– for the M16 engine: 51,732–51,750 mm.

b. Using a micrometer, measure diameter of a pro-polished neck of a shaft.

Measurements have to be performed in two co-perpendicular directions for ovality verification.

c. On the basis of results of measurement of diameter of a neck of a shaft and alphabetic reference on the block of cylinders pick up the bearing of the increased thickness for the following table.

Check a gap in the bearing for the picked-up bearing of the increased thickness.

Measure diameter of a carving of each bolt of fastening of a cover of the bearing 1 in points of "A" and "B" by a micrometer Calculate a difference of diameters ("A" - "B"). If the difference of diameters exceeds extreme value, replace bolts new.

Points of measurement of diameter of a bolt of fastening of a cover of the radical bearing of a bent shaft No. 1 "a": 60 mm, "b": 90 mm.

Fig. 2.175. Scheme of measurements of diameter of a bolt of fastening of a cover of the bearing

Extreme value of a difference of diameters of a bolt of fastening of a cover of the radical bearing of a bent shaft No. 1: ("A" - "B"): 0,2 mm.

Fig. 2.176. Sensor plate

Check a sensor plate for existence of cracks. If the plate has defects, replace it.

Carefully examine an epiploon 1 regarding wear or damage. If its working edge is worn-out or damaged, replace an epiploon.

Fig. 2.177. Back epiploon

Fig. 2.178. Press fitting of a back epiploon

For installation of an epiploon, press a back epiploon 1 in the case of an epiploon 2 with use of the special tool, as shown in the figure 2.178.

Adjusting provision of a back epiploon of the crankshaft (size): 3 mm.

Fig. 2.179. Measurement of a face beating of a flywheel indicator of hour type

If the gear wreath has damages, cracks or is worn-out, replace a flywheel.

If the surface contacting with the conducted clutch plate is damaged or excessively worn-out, replace a flywheel.

Check a face beating of a flywheel the indicator of hour type. If the beating exceeds extreme value, replace a flywheel.

Extreme value of a beating of a flywheel: 0,2 mm.

Fig. 2.180. Check of deformation of the condensed surface of the block of cylinders

Using a testing ruler and the probe, check the condensed surface for existence of deformation and in case the deviation from planeness exceeds extreme value, carry out editing of a surface.

Extreme value of planeness of the block of cylinders: 0,05 mm.

In need of boring of the separate cylinder all other cylinders also have to be chiseled.

Pick up pistons of the increased size depending on wear of cylinders.

Using a micrometer, measure diameter of the piston.

Place of measurement of diameter of the piston: 19,5 mm.

Fig. 2.181. Measurement of diameter of the piston

Calculate the repair diameter of the cylinder as follows.

D=A+B–C

D: Repair diameter of the cylinder.

A: Diameter of the piston by results of measurement.

B: The gap between the piston and the cylinder is equal to 0,02-0,04 mm.

C: The allowance for a honingovaniye is equal to 0,02 mm.

Chisel also to an otkhoninguyta the cylinder to the settlement repair size.

NOTE Before boring, establish into place all covers of radical bearings and tighten the nominal moment to avoid deformation of openings under bearings.

After a honingovaniye measure a gap between the piston and the cylinder.