Nissan Almera service from 1995 to 2000 in N15 body
1. General information
2. The general requirements to car repairs
3. Operation and car maintenance
4. Petrol engines
4.1. Removal and installation of the power unit
4.2. Dismantling and engine assembly
4.3. Block of cylinders
4.4. Shatunno-porshnevaya group
4.5. Cranked shaft and flywheel
4.5.1. Check of a technical condition
4.5.2. Check of gaps between loose leaves and necks of a cranked shaft
4.5.3. Check of an axial gap of a cranked shaft
4.6. Gazoraspredeleniye mechanism
4.7. Head of the block of cylinders of GA14DE and GA16DE engines
4.8. Head of the block of cylinders of the SR20DE engine
4.9. Cooling system
4.10. Greasing system
4.11. System of production of the fulfilled gases
4.12. Power supply system
4.13. Complex control system of the engine (KSUD)
5. Diesel engines
6. Transmission
7. Running gear
8. Steering
9. Brake system
10. Electric equipment
11. Body
12. Appendices
13. Electric equipment schemes
 







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4.5. Cranked shaft and flywheel


Fig. 2.5. Details of the block of cylinders and krivoshipno-shatunny mechanism of GA14DE and GA16DE engines: I\with a mechanical transmission; II\with an automatic transmission;
1 — the block of cylinders; 2 — the holder of a back cuff of a cranked shaft; 3 — a drain stopper of cooling liquid of the block of cylinders; 4 — an arm; 5 — loose leaves of radical bearings of a cranked shaft; 6 — persistent half rings of a cranked shaft; 7 — a cranked shaft; 8 — covers of radical bearings of a cranked shaft; 9 — the plug of a drive of the oil pump; 10 — an asterisk of a cranked shaft;
11 — segment shponka; 12 — a cover of the bottom head of a rod;
13 — shatunny loose leaves; 14 — a rod; 15 — lock rings;
16 — a piston finger; 17 — the piston; 18 — a maslosjemny ring; 19 — the bottom kompressionny ring; 20 — the top kompressionny ring; 21 — a back cuff of a cranked shaft; 22 — a back cover; 23 — a flywheel; 24 — the bottom cover; 25 — a back cover; 26 — a conducted disk


Cranked shaft pig-iron, five-basic with four counterbalances (see fig. 2.5 and 2.6).

Fig. 2.6. Details of the block of cylinders and krivoshipno-shatunny mechanism of the SR20DE engine:
1 — a cover of a chain of a drive of the mechanism of a gazoraspredeleniye; 2 — an arm of fastening of the generator;
3 — the water pump; 4 — the block of cylinders; 5 — the holder of a back cuff of a cranked shaft; 6 — persistent half rings; 7 — a flywheel; 8 — a back cover; 9 — a cranked shaft; 10 — the loose leaf of the radical bearing; 11 — a cover of the radical bearing; 12 — a bed of radical bearings of a cranked shaft;
13, 14 — the maslootrazhatelny screen; 15 — an aluminum case; 16 — a maslouspokoitelny guard;
17 — a steel stamped case; 18 — a stopper of a drain opening; 19 — a cover; 20 — a rod and a rod cover; 21 — loose leaves of the bottom head of a rod; 22 — lock rings; 23 — a piston finger; 24 — the plug of the top head of a rod; 25 — the piston; 26 — piston rings; 27 — a maslopriyemnik with the filter of the oil pump; 28 — a sealing ring


On diameter of radical and shatunny necks cranked shaft are broken into three dimensional groups, except for a cranked shaft of the SR20DE engine having four dimensional groups (tab. 2.3).

Table 2.3  Dimensional characteristics of a cranked shaft, mm
Engine model
Dimensional group
1
2
3
4
Diameter of radical necks
GA14DE and GA16DE engines
49,956-49,964
49,948-49,956
49,940-49,948
-
SR20DE engine
54,974-54,980
54,968-54,974
54,962-54,968
54,956-54,962
Diameter of shatunny necks
GA14DE and GA16DE engines
39,968-39,974
39,962-39,968
39,956-39,962
-
SR20DE engine
47,968-47,974
47,962-47,968
47,956-47,962
-
Gap between the loose leaf and a radical neck
GA14DE and GA16DE engines
0,018-0,042 (nominal)
SR20DE engine
0,004-0,022 (nominal)
GA14DE and GA16DE engines
0,1 (maximum)
Gap between the loose leaf and a shatunny neck
GA14DE and GA16DE engines
0,010-0,035 (nominal)
SR20DE engine
0,020-0,045 (nominal)
GA14DE and GAS16DE engines
0,1 (maximum)
Axial gap of a cranked shaft
GA14DE and GAS16DE engines
0,06-0,18 (nominal)
SR20DE engine
0,10-0,26 (nominal)
All engines
0,3 (maximum)
Axial gap of a rod
All engines
0,20-0,47 (nominal)
0,52 (maximum)
Ovality of radical and shatunny necks, no more
All engines
0,005
Konusnost of radical and shatunny necks, no more
All engines
0,002


Two persistent half rings are established in nests on either side of from the central support of a cranked shaft. They provide adjustment of an axial gap of a cranked shaft. Half rings are established by the party with flutes to a cranked shaft.
The pig-iron flywheel is fixed by bolts on cranked to a shaft. The centering of a flywheel is provided with the adjusting plug. The maximum axial palpation of a flywheel on diameter of 115 mm should not exceed 0,15 mm.

Fig. 2.8. Marking of dimensional groups of diameters of cylinders on the block of GF14DE and GA16DE engines: 1 — numbers of dimensional groups of diameters of cylinders; 2 — numbers of dimensional groups (categories of the sizes) loose leaves of bearings of a cranked shaft; 3 — number of dimensional group of diameter of the cylinder No. 1; 4 — number of dimensional group (category of the size) bearing No. 1 loose leaves


Fig. 2.11. Marking of dimensional groups of diameters of necks of a cranked shaft: 1 — a code of dimensional groups of diameters of shatunny necks of a cranked shaft; 2 — a code of dimensional groups of diameters of radical necks of a cranked shaft; 3 — a label of dimensional group of diameter of a shatunny neck No. 1;
4 — a label of dimensional group of diameter of a radical neck No. 1


Fig. 2.12. Loose leaves of radical bearings of a cranked shaft: 1 — the loose leaf with a flute and an opening for greasing, is established from the block of cylinders; 2 — the smooth loose leaf, is established in a cover of the case of the radical bearing; 3 — marking by paint of dimensional group


The marking facilitating their complete set is put on the block of cylinders and a cranked shaft. Marking includes a five-place code of category of the sizes of established loose leaves and diameters of cylinders. On fig. 2.8 and 2.11 examples of interpretation of the specified parameters are given. Loose leaves of radical bearings thin-walled steel with a working surface from an aluminum-tin alloy. The loose leaves established in the block of cylinders, have flutes and openings for greasing. The loose leaves established in covers of bearings, smooth (fig. 2.12). On thickness all loose leaves are broken into dimensional groups which are marked by paint at an end face.
Loose leaves of shatunny bearings also steel thin-walled with a working surface from an aluminum-tin alloy. Loose leaves from a rod have an opening which at assembly is combined with an opening in a rod body. Loose leaves too are broken by Shatunnye into groups on the thickness, marked by paint at (tab. 2.4) end face. Repair loose leaves also differ on dimensional groups.

Table 2.4 Thickness of loose leaves
Engine
Dimensional group and color
0 black
1 brown
2 green
3 yellow
4 blue
5 pink
6 white
Radical loose leaves
GA14DE MGA16DE
1,827-1,831
1,831-1,835
1,835-1,839
1,839-1,843
1,843-1,847
-
-
SR20DE
1,977-1,980
1,980-1,983
1,983-1,986
1,986-1,989
1,989-1,992
1,992-1,995
1,995-1,998
Shatunnye loose leaves
GA14DE MGA16DE
1,503-1,506*
1,506-1,509
1,509-1,512
-
-
-
-
SR120DE
1,500-1,503*
1,503-1,506 **
-
-
-
-
-

* Without a color label.
** Label of black color.



Thickness of loose leaves of GA14DE and GA16DE engines, mm:
the radical:
       +0,25 1,960 — 1,964
       +0,50 2,085 — 2,089
shatunny:
       +0,08 1,542 — 1,546
       +0,12 1,562 — 1,566
       +0,25 1,627 — 1,631
Thickness of loose leaves of the SR20DE engine:
the radical:
       +0,05 2,109 — 2,117
shatunny:
       +0,08 1,541 — 1,549
       +0,12 1,561 — 1,569
       +0,25 1,626 — 1,634

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