85425ea0

4.1.1. Technical characteristic

The OHV engine is an engine with one camshaft installed in the block of cylinders.

Designation
12 SC
Diameter of the cylinder x piston stroke
79,0 x 61,0 mm
Working volume
1196 cm3
Extent of compression
9,0: 1
Valvate gaps (warm engine):
  – inlet
0,15 mm
  – final
0,25 mm
Head of the block of cylinders
Designation
Е
Valve saddle width:
  – inlet
1,25 – 1,50 mm
  – inlet
1,25 – 1,50 mm
Full height
81 ± 0,25 mm

Valves and guides

Parameter
Inlet
Final
Length
99,3 mm
101,1 mm
Diameter of a plate
32 mm
29 mm
Diameter of a core (face value, ± 0,005 mm):
  – standard
7,005 mm
6,995 mm
  – the increased size 1
7,080 mm
7,060 mm
  – the increased size 2
7,155 mm
7,135 mm
  – the increased size A
7,255 mm
7,235 mm
Internal diameter of the directing valve plug (± 0,01 mm):
  – standard
7,035 mm
  – the increased size 1
7,110 mm
  – the increased size 2
7,185 mm
  – the increased size A
7,285 mm
Valvate gap in a guide:
  – inlet
0,015 – 0,045 mm
  – final
0,035 to 0,065 mm
Corner of a working facet
44 °

Camshaft

Radial side play
At most 0,03 mm
Axial side play
0,17 – 0,43 mm
Raising of a cam
6,45 mm

Pistons and cylinders


Parameter
Diameters
Marking
Production size 1
78,95 mm
5
78,96 mm
6
78,97 mm
7
78,98 mm
8
Production size 2
78,99 mm
99
79,00 mm
00
79,01 mm
01
79,02 mm
02
Production size 3
79,03 mm
03
79,04 mm
04
79,05 mm
05
79,06 mm
06
Production size 4
79,07 mm
07
79,08 mm
08
79,9 mm
09
79,10 mm
1
The increased size (+ 0,5 mm face value)
79,47 mm
79,47/7 + 0,5
79,48 mm
79,48/8 + 0,5
79,49 mm
79,49/9 + 0,5
79,50 mm
79,50/0 + 0,5
Gap between the piston and the cylinder
0,1 – 0,3 mm
Ovality and conicity of cylinders
At most 0,013 mm

Piston rings

Quantity on the piston
2 compression, 1 oil scraper
Thickness:
  – compression
2,0 mm
  – oil scraper
5,0 mm
Locks of rings:
  – shift of locks of piston rings
180 ° (see subsection 4.1.10.2)
  – a gap of piston rings in a piston flute
It is not specified – typical 0,06 mm

Piston fingers

Length
65 mm
Diameter
20 mm
Gap in the piston
0,0015 – 0,0195 mm
Gap in a rod
Without gap (motionless landing)

Bent shaft and bearings

Number of radical bearings
3
Diameters of necks of radical bearings – standard:
  – forward
53,997 – 54,010 mm
  – central and back
54,007 – 54,020 mm
Width of a neck of the central radical bearing – standard
29,000 – 29,052 mm
Identification of an insert of the radical bearing:
  – increased on 0,25
A
  – increased on 0,50
In
Ovality of radical and conrod necks
At most 0,006 mm
Conicity of radical and conrod necks
At most 0,01 mm
Axial side play of a bent shaft
0,09 – 0,20 mm
Rod side play
0,02 – 0,06 mm
Working gap of radical bearings:
  – forward
0,020 – 0,046 mm
  – central
0,010 – 0,036 mm
  – back
0,010 – 0,032 mm
Working gap of the conrod bearing
0,11 – 0,24 mm
Beating of a bent shaft (on the central neck)
At most 0,03 mm

Identification of inserts of radical bearings


Insert
Color
Code
Standard:
  – forward top
Brown
1 ON or 701-N
  – forward lower
Brown
1 UN or 702-N
  – the central top
Brown
20 + UN or 705-N
  – the central lower
Green
20 + UN or 725-N
  – back top
Green
631-N
  – back lower
Green
635-N
Standard neck, opening of the increased size:
  – forward top
U1-OB
  – forward lower
U1-U
  – central, top and lower
U
  – back top
U3-OB
  – back lower
U3-U
Diameter of a conrod neck – standard
44,971 – 44,987 mm
The increased sizes of radical and connecting rods
0,25 mm production and repair; 0,50 mm only repair
The increased size 0,25:
  – forward top
Brown-blue
1 OA or 006-A
  – forward lower
Brown-blue
1 UA or 008-A
  – the central top
Brown-blue
20 + UA or 014-A
  – the central lower
Brown
20 + UA or 034-A
  – back top
Green-blue
632-A
  – back lower
Green-blue
636-A
The increased size 0,50:
  – forward top
Brown-black
1 OB or 027 V
  – forward lower
Brown-black
1 U or 029 V
  – the central top
Brown-black
2 OB 0,35 IN
  – the central lower
Green-black
2 UB 0,35 IN
  – back top
No
3 OB 0,50
  – back lower
No
3 U 0,50

Flywheel


Beating of a gear wreath
At most 0,5 mm
Machining thickness from coupling
At most 0,3 mm

Lubrication system

Gaps of the oil pump:
  – between teeths of gear wheels
0,1 – 0,2 mm
  – between a gear wheel and the case
0,04 – 0,10 mm
Oil pressure on idling turns (the engine warm)
1,5 bars

Tightening moments

Bolts of fastening of a flywheel (every time use new bolts):
  – stage 1
35 Nanometer
  – stage 2
To tighten on a corner 50 ° – 90 °
Covers of radical bearings
62 Nanometer
Covers of conrod bearings
27 Nanometer
Bolts of fastening of the oil pallet (with structure interfering unscrewing)
5 Nanometer
Bolts of fastening of a head of the block of cylinders (every time use new bolts):
  – stage 1
25 Nanometer
  – stage 2
To tighten on a corner 60 °
  – stage 3
To tighten on a corner 60 °
  – stage 4
To tighten on a corner 60 °
Camshaft pulley
40 Nanometer
Pulley of a bent shaft
40 Nanometer
Right support of the power unit:
  – to the block of cylinders (to establish the lower bolt with sealant use)
20 Nanometer
  – to a damper
40 Nanometer
Support of the power unit to a body:
  – back left
65 Nanometer
  – back right
40 Nanometer
Drain stopper of the oil pallet
45 Nanometer
Bolts of fastening of the oil pump
20 Nanometer