Ford Sierra

1982-1993 of release

Repair and operation of the car



Ford Siyerra
+ 1.2. Identification of the car
+ 2. Maintenance
- 3. General data
   - 3.1. Cars with petrol engines
      3.1.1. Masses and transfer numbers
      3.1.2. Operational liquids
      + 3.1.3. Changes in a car design from 1984 to 1986.
      - 3.1.4. Changes in a car design from 1987 to 1989.
         3.1.4.1. OHC engine
         + 3.1.4.2. Dm3 CVH 1,8 engine
         - 3.1.4.3. DOHC engine
            - 3.1.4.3.1. Technical characteristics
               3.1.4.3.1.1. Head of the block of cylinders of the engine
               3.1.4.3.1.2. Block of cylinders of the engine
               3.1.4.3.1.3. Krivoshipno-shatunny mechanism
               3.1.4.3.1.4. System of gas distribution
               3.1.4.3.1.5. Lubrication system
               3.1.4.3.1.6. Cooling system
               3.1.4.3.1.7. Fuel system
               3.1.4.3.1.8. System of ignition
               3.1.4.3.1.9. Tightening moments
         + 3.1.4.4. Service and repair
         + 3.1.4.5. Coupling
         3.1.4.6. Mechanical five-speed transmission of N type
         + 3.1.4.7. Mechanical MT 75 five-speed transmission
         3.1.4.8. Automatic transmission
         3.1.4.9. Forward suspension bracket
         + 3.1.4.10. Brake system
         + 3.1.4.11. Electric equipment
         3.1.4.12. General data
      + 3.1.5. Changes in a car design from 1990 to February, 1993.
   + 3.2. Cars with diesel engines
+ 4. Engines
+ 5. Coupling
+ 6. Transmissions
+ 7. Driveshaft and back bridge
+ 8. Steering
+ 9. Suspension brackets
+ 10. Brake system
+ 11. Body
+ 12. Electric equipment


a773976c

3.1.4.3.1.1. Head of the block of cylinders of the engine

GENERAL INFORMATION

The head of the block of cylinders is cast under pressure from light alloy and has plug-in saddles of valves.

Designation: 20

Diameters of openings of plugs of bearings of cam-shafts: 26,00–26,03 mm.

Prevention

Grinding of the lower surface of a head of the block of cylinders is inadmissible.


Laying of a head of the block of cylinders

Laying of a head of the block of cylinders is established without use of sealant.

Brand: Reinz.

Valves

Valves with a V-shaped arrangement, are inclined at an angle 20 ° to an axis of the cylinder and are put in action by two cam-shafts (inlet valves and final valves).

Sizes of valves (mm)

Valve type
Inlet
Final
Length
108,24 – 108,70
108,71 – 109,17
Diameter of a plate
42,5 – 42,7
37,9 – 38,1
Diameter of a core:
  – nominal
7,025 – 7,043
6,999 – 7,017
  – repair 0,2
7,225 – 7,243
7,199 – 7,217
  – repair 0,4
7,425 – 7,443
7,399 – 7,417
  – repair 0,6
7,625 – 7,643
7,599 – 7,617
  – repair 0,8
7,825 – 7,843
7,799 – 7,817
Core gap in a guide (mm)
0,020 – 0,069
0,046 – 0,095
Corner of a working facet
90 °
90 °

Working gap of valves

In the engine the hydraulic pushers providing automatic adjustment of a gap of valves are used.

Saddles of valves

The saddles of valves made of alloy of steel and copper are inserted into a head of the block of cylinders.

Sizes of saddles of valves

Saddle type Nest of the inlet valve Nest of the final valve
Corner of the top facet
60 °
60 °
Corner of a working facet
89 ° – 90 °
89 ° – 90 °
Width of a working facet
1,33 – 2,19
1,68 – 2,54
Corner of the lower facet
140 °
140 °

Guides of valves

Guides of valves are made of cast iron, inserted into a head of the block of cylinders and inclined to a cylinder axis at an angle 120 °.

Diameters of openings of guides (standard): 7,063 – 7,094 mm.

Springs of valves

About two springs on each valve are used.

Characteristic of springs of valves

Spring type
External
Internal
Free length (mm)
46,8
46,2
Internal diameter (mm)
24
17,5
Diameter of a wire (mm)
4,5
2,5
Number of working rounds
6,1
8