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
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