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4.3.1. Technical characteristic

DOHC engines are engines with two camshafts located in a head of the block of cylinders.

Type:
All models
The engine with four cylinders rowed, with water cooling, established cross in a forward part of the car. The drive of valves is carried out by two camshafts put in action by a gear belt through hydraulic pushers
Codes of engines
20 XE, C20 XE or 20 XEJ
Diameter of cylinders
86,0 mm
Piston stroke
86,0 mm
Working volume
1998 cm3
Operating procedure of cylinders:
All models
1–3–4–2 (the cylinder No. 1 is located from a gear belt)
Direction of rotation of a bent shaft
Clockwise
Extent of compression
10,5: 1

Prevention

The code of the engine is specified by the first figures from number of the engine.


Block of cylinders

Diameter of cylinders of the engine
Diameter
Marking
Standard size 1
85,98 mm
8
85,99 mm
99
86,00 mm
00
86,01 mm
01
Standard size 2
86,02 mm
02
86,47 mm
7 + 0,5
86,48 mm
8 + 0,5
86,49 mm
9 + 0,5
86,50 mm
0 + 0,5
The most admissible ovality of cylinders
0,013 mm
The most admissible conicity of cylinders
0,013 mm

Bent shaft

Number of radical bearings
5
Diameter of radical necks
57,982 - 57,995 mm
Diameter of a conrod neck
48,971 - 48,987 mm
The increased size
0,25 and 0,50 mm
Axial side play of a bent shaft
0,07 - 0,3 mm
Working gap of the radical bearing
0,015 - 0,04 mm
Working gap of the conrod bearing
0,019 - 0,063 mm
Side gap of the lower head of a rod
0,07 - 0,24 mm
Color identification of inserts:
  – top inserts:
     • radical, standard
Brown
     • radical, increased by 0,25 mm
Brown / blue
     • radical, increased by 0,5 mm
Brown / white
     • conrod, standard
No
     • conrod, increased by 0,25 mm
Blue
     • conrod, increased by 0,5 mm
White
  – lower inserts:
     • radical, standard
Green
     • radical, increased by 0,25 mm
Green / blue
     • radical, increased by 0,5 mm
Green / white
     • conrod, standard
No
     • conrod, increased by 0,25 mm
Blue
     • conrod, increased by 0,5 mm
White
Ovality of radical and conrod necks
At most 0,04 mm
Side side play of a bent shaft (on the central neck)
At most 0,03 mm

Pistons and piston rings

Diameter of the piston
0,03 mm less than diameter of the cylinder
Piston gap in the cylinder (all models)
0,02 - 0,04 mm

Piston fingers

Length
61,5 mm
Diameter
21 mm
Gap in the piston
0,003 - 0,010 mm
Gap in a rod
0,015 - 0,030 mm

Head of the block of cylinders

The minimum height of a head of the block of cylinders after machining
135,63 mm
The most admissible neploskosnost of the lower surface of a head of the block of cylinders (all models)
0,025 mm
Diameter of bearings of the camshaft
28,000 - 28,021 mm
Valve saddle width:
  – inlet
1,0 - 1,4 mm
  – final
1,4 - 1,8 mm

Camshafts

Drive
Gear belt
Number of bearings:
  – inlet
5
  – final
6
Diameter of a neck of the bearing
27,939 – 27,960 mm
Working gap of a neck of the bearing
0,061 mm
Axial side play
0,04 – 0,144 mm
Height of raising of a cam
9,5 mm

Valve

Corner of a working facet
44 ° 40'
Length:
  – nominal
105 mm
  – minimum
104,6 mm
Diameter of a plate:
  – inlet
33 mm
  – final
29 mm
Diameter of a core (standard):
  – inlet
6,955 - 6,970 mm
  – final
6,945 - 6,960 mm
Diameter of a core (the increased size)
0,075 and 0,150 mm
Gap between a core and a guide of the valve:
  – inlet
0,045 mm
  – final
0,055 mm
Valvate gap
It is automatically regulated by hydraulic pushers of the valve
Internal diameter of the directing valve plug:
  – standard
7,000 - 7,015 mm
  – the increased size
0,075 and 0,150 mm
Height of installation of the directing valve plug
10,70 - 11,00 mm

Tightening moments

Starter to the block of cylinders
45 Nanometer
Starter arm to the block of cylinders
25 Nanometer
Collector nuts
20 Nanometer
Bolts of fastening of the generator to the block of cylinders
40 Nanometer
Arm of the pump of the amplifier of steering
40 Nanometer
Bolts of fastening of a pulley of an auxiliary driving belt of a bent shaft to a pulley of a gear belt
20 Nanometer
Central bolt of fastening of a pulley of a bent shaft:
  – stage 1
250 Nanometer
  – stage 2
To tighten on a corner 40 - 50 °
Bolts of fastening of covers of the radical bearing:
  – stage 1
50 Nanometer
  – stage 2
To tighten on a corner 40 - 50 °
Fastening of a cover of the conrod bearing:
  – stage 1
35 Nanometer
  – stage 2
To tighten on a corner 45 - 60 °
Support of the power unit (it is necessary to apply the means interfering their unscrewing on a carving of bolts)
75 Nanometer
Fastening of covers of bearings of the camshaft:
  – M8
20 Nanometer
  – M9
10 Nanometer
Oil discharge stopper
45 Nanometer
The oil pump to the block of cylinders
6 Nanometer
Bolts of fastening of the oil pallet (it is necessary to apply the means interfering their unscrewing on a carving of bolts)
15 Nanometer
Bolts of fastening of a flywheel (it is necessary to apply the means interfering their unscrewing on a carving of bolts):
  – stage 1
65 Nanometer
  – stage 2
To tighten on a corner 30 - 45 °
Bolts of fastening of the water pump
25 Nanometer
Bolts of fastening of a pulley of the camshaft:
  – stage 1
50 Nanometer
  – stage 2
To tighten on a corner 40 - 50 °
The mechanism of a tension of a gear belt and the directing rollers:
  – stage 1
25 Nanometer
  – stage 2
To tighten on a corner 45 - 60 °
Cover of a head of the block of cylinders
8 Nanometer
Bolts of fastening of a head of the block of cylinders:
  – stage 1
25 Nanometer
  – stage 2
To tighten on a corner 65 °
  – stage 3
To tighten on a corner 65 °
  – stage 4
To tighten on a corner 65 °
Warm up the engine up to the normal working temperature
To tighten on a corner 30 °

Prevention

All bolts which dovorachivatsya on a certain corner have to be replaced every time after their unscrewing.