3.25. The sizes of the main interfaced details of the engine and limits of admissible iznos in operation

The interfaced details

The sizes of the interfaced details, mm

Admissible gap in interface, mm
Opening
Shaft
The piston – the cylinder:

Class A

76,00–76,01 * / 79,0–79,01

75,94–75,95 / 78,93–78.94

0,15

Class B

76,01–76,02 / 79,01–79,02

75,95–75,96 / 78,94–78,95

0,15

Class C

76,02–76,03 / 79,02–79,03

75,96–75,97 / 78,95–78,96

0,15

Class D

76,03–76,04 / 79,03–79,04

75,97–75,98 / 78,96–78,97

0,15

Class E

76,04–76,05 / 79,04–79,05

75,98–75,99 / 78,97–78,98

0,15

The piston – a piston finger **:

  • 1st category

21,982–21,986

21,970–21,974

  • 2nd category

21,986–21,990

21,974–21,978

  • 3rd category

21,990–21,960

21,970–21,982

The top head of a rod – a piston finger ***

21,940–21,960

21,970–21,982

The piston – the top compression ring

1,535–1,555 (flute width)

1,478–1,490 (ring height)

0,15

The piston – the lower compression ring

2,015–2.035 (flute width)

1,978–1,990 (ring height)

0,15

The piston – an oil scraper ring

3,957–3,977 (flute width)

3,925–3,937 (ring height)

0,15

The cylinder – a piston ring (a gap in the lock of rings):

  • top

0,30–0,45

0,30–0,45

The compression in the cylinder has to be not less than 10 kgfs/cm 2

  • the others

0,25–0,40

0,25–0,40

The block of cylinders plus radical inserts – a bent shaft

54,507–54,520+2(1,824–1,831)

50,775–50,795

0,15

Bent shaft (length of a back neck) – the block of cylinders (width of a back support) plus persistent half rings

27,975–28,025

23,14–23,20+2(2,31–2,36)

0,35

Rod plus connecting rods – a bent shaft

51,330–51,346+2(1,723–1,730)

47,814–47,834

0,1

The case of bearings of the camshaft – the camshaft:

  • 1st support

46,000–46,025

45,915–45,931

0,2

  • 2nd support

45,700–45,725

45,615–45,631

0,2

  • 3rd support

45,400–45,425

45,315–45,331

0,2

  • 4th support

45,100–45,125

45,015–45,031

0,2

  • 5th support

43,500–43,525

43,415–43,431

0,2

The directing plug – the inlet valve

8,022–8,040

7,985–8,000

0,15

The directing plug – the final valve

8,029–8,047

7,985–8,000

0,15

The roller of the drive of auxiliary units – the forward plug

48,084–48,104

48,013–48,038

0,15

The roller of the drive of auxiliary units – the back plug

22,00–22,02

21,94–21,96

0,15

Gear wheel of the drive of the oil pump – the plug

16,016–16,037

15,970–15,985

0,15

The case of the oil pump – a gear wheel:

  • on height

30,055–30,117

29,956–29,989

0,2

  • on diameter

34,08–34,12

33,940–33,970

0,25

* In numerator – for the engine 2103, in a denominator – for 2106. Since 1988 on engines 2106 diameter of the piston is increased by 0,01 mm in comparison with specified in the table.
** The greased piston finger at admissible wear should not drop out on lugs if to keep it in the piston vertically.
*** At admissible wear slipping of a finger under load of 400 kgfs is not allowed.