Shatunno-porshnevaya group. Nissan Almera (from 1995 to 1999 of release)
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
4.4.1. Check of a technical condition
4.5. Cranked shaft and flywheel
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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4-4-shatunno-porshnevaya-gruppa.html

4.4. Shatunno-porshnevaya group

Pistons are made of an aluminum alloy, have the flat bottom and three flutes for rings.
On diameter pistons are broken into three groups for the nominal size and on two groups for the repair size (tab. 2.2).

Table 2.2  Dimensional groups of pistons
Diameter of the piston, mm
Engine model
GA14DE
GA16DE
SR20DE
1-group of the nominal size
73,575-73,585
75,975-75,985
86,00-86,01
2nd group of the nominal size
73,585-73,595
75,985-75,995
86,01-86,02
3rd group of the nominal size
73,595-73,605
75,995-76,005
86,02-86,03
Repair group  - t-0,5
74,075-74,105
76,475-76,505
-
Repair   group +0,1
74,575-74,605
76,975-77,005
-
Repair   group +0,2
-
-
86,18-86,21


Dimensional groups are marked by figures on the piston bottom. Pistons of the repair sizes intend for installation in the block of cylinders after boring. The label on the bottom of the piston should be turned towards a drive of camshafts.
Diameter of an opening in lugs under a piston finger makes, mm:
for       GA 18,987 engines — 18,999
for       SR 21,987 engines — 21,999
The gap between a mirror of the cylinder and the piston makes, mm:
for       GA 0,015 engines — 0,035
for       SR 0,01 engines — 0,03
Piston fingers hollow, steel, tempered and shlifovanny, freely rotate in the plug of a rod and are pressed by small effort in a cold condition in an opening of lugs of the piston. Fingers refrain from axial moving by two spring lock rings.
Diameter of a piston finger, mm:
       GF 18,989 engines — 19,001
for       SR 21,989 engines — 22,001
Tightness in an opening of a lug of the piston 0 — 0,004 mm. A gap between a piston finger and the plug of the top head of a rod 0,005 — 0,017 mm.

Fig. 2.4. Installation of piston rings: I\order of installation of piston rings; II\arrangement of locks of piston rings; 1 — a label on the piston, directed towards a drive of camshafts; 2 — a joint of a dilator of a maslosjemny ring; 3 — the lock of the top kompressionny and top maslosjemny ring; 4 — the lock of a maslosjemny ring; 5 — the lock of the bottom kompressionny ring


On each piston it is established on three rings (fig. 2.4): top kompressionny chromeplated, with a barrel-like surface; bottom kompressionny scraper type; maslosjemny with a dilator, top and bottom rings.
The gap between piston rings and flutes of the piston makes:
— for the top ring — 0,04 — 0,08 mm, maximum permissible 0,2 mm;
— for the bottom ring — 0,03 — 0,07 mm, maximum permissible 0,2 mm.
Gap in the lock:
— for the top ring — 0,2 — 0,35 mm;
maximum permissible for GA engines — 1 mm;
maximum permissible for SR engines — 0,49 mm;
— for the bottom ring — 0,37 — 0,52 mm;
maximum permissible for GA engines — 1 mm;
maximum permissible for SR engines — 0,64 mm;
— for a maslosjemny ring — 0,2 — 0,6 mm;
maximum permissible for GA engines — 1 mm;
maximum permissible for SR engines — 1,09 mm.
Rods steel, shod, dvutavrovy section, the bottom head of a rod with the direct socket. At installation the label on a cover of the bottom head of a rod settles down opposite to a label on a rod; the opening for greasing is guided towards a starter.
The distance between centers openings of the top and bottom heads of a rod of GA engines makes 140,45 — 140,55 mm.
Diameter of an opening of the bottom head of a rod, mm:
       GA 43,000 engines — 43,012
       SR 51,000 engines — 51,013
Diameter of an opening of the plug of the top head of a rod, mm:
       GA 19,000 engines — 19,012
       SR 22,000 engines — 22,012


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