Repair parts and components
MOTOR. Changing the rod bearings and main bearings
When deciding on the need to change inserts
bearings should be borne in mind that the diametrical wear
bearings and crankshaft journals is not always the determining
the criterion. In operation, the motor
antifriction layer liners interspersed significant
amount of solid particles (products of wear
abrasive particles are sucked into the engine cylinders with
Therefore, these liners, often with little
diametrical wear, can cause further
accelerated depreciation and rexinforced crankshaft journals.
It should also be borne in mind that the connecting rod bearings work in
more severe conditions than natives. The intensity of wear
slightly higher than the rate of wear of main bearings.
Thus, to address the issue of replacing the bearings needed
differentiate between main and connecting rod
In deciding whether to replace the bearings, connecting rod as well as
indigenous, should be guided by the following:
- In the assessment of ear examination, keep in mind that
surface of the antifriction layer is satisfactory
if there are no scratches, pitting
(On the work surface does not show traces of lead ....
bronze gold color) and depressed in the fusion of foreign
- .... Paint the surface of the antifriction alloy is
- .... Liners, suitable for further installation
engine should be straightening of the day, which provides
creation in bed (in a block in the covers of indigenous
and connecting rod bearings and a rod) tightness. The presence of tightness
liner ensures the necessary heat from the liner,
thanks to a better fit to the surface of the liner surface
the bed. Inserts that do not have a tightness in their beds,
to be replaced;
- The permissible diametrical clearance in the bearings
crankshaft are shown in table 2. Clearance in the bearings
found by calculating the difference between the sizes obtained with
metering bore in bed with embedded inserts
(Cervix doolzhna be necessary to pull force) and the shaft journal.
The required value of diametrical clearance in the bearings during repair
the engine in some cases can be achieved
without pereshlifovki neck, only the application of new liner
In all other cases, the necessary clearances obtained by grinding
necks of the shaft and installing the appropriate repair liners
size. To replace worn or damaged bearings
in the spare parts are delivered and vkladyshinominalnogo
four sizes of repair. Inserts repair size
differ from the nominal size of inserts in a decrease
0.25, 0.50, 0.75, 1.00 mm internal diameter (Table 4).
To install these bearings crankshaft journals should
be abraded by an amount corresponding decrease.
When the application inserts the size of repair does not provide
obtaining the necessary clearances in the bearings
crankshaft (shaft had been abraded by the maximum
decrease), it is necessary to install a new crankshaft
inserts with nominal size. For such a case
in spare parts kit is 412-1000107-03, consisting
of the crankshaft, connecting rod and a set of bearings and indigenous
nominal size. Thin-walled interchangeable inserts
connecting rod and main bearing crankshaft
manufactured with high precision.
The required value of the gap in the bearing diametraldnogo
only ensured adequate diameter crankshaft journals
shaft, obtained by grinding.
Therefore inserts in the repair of the engine replaced with new
without any adjustable operations and only in pairs.
Replacement of the liner of a pair is not allowed. From the above also
It follows that to obtain the desired diametrical clearance
the bearings are not allowed to file down or prishabrivat
joints or inserts bearing caps, burn on these joints
details or to place spacers between the liner and the bed.
Failure to follow these guidelines leads to what is broken
correct geometry of bearings,
worse heat pads on them quickly gone.
But the most dangerous that the bearing of felled or
prishabrennymi lids are not recommended in the future
install new liners repair sizes. Spoiled
processing of the bearing caps can not be replaced because
they were processed at the plant
together with the cylinder block or connecting rod. Since the cover
bearings are not interchangeable, they are not supplied in spare
part, and so the engine is damaged
lids can not be subsequent repair.
After replacing the connecting rod bearings as well as main bearings
assembled motor shall be subjected to run-in.