Ford Sierra

1982-1993 of release

Repair and operation of the car

3.2.1.2.2. Head of the block of cylinders

GENERAL INFORMATION

The sizes of a nest of the vortex combustion chamber in a head of the block of cylinders

Valve saddle sizes

The head of the block of cylinders is cast from cast iron and has the inserted saddles of valves and vortex combustion chambers. Nests of bearings of a cam-shaft are executed directly in material of a head of the block of cylinders.

Diameters of openings of nests of bearings of a cam-shaft:
– nominal:	30,500 – 30,525 mm;
– repair:	30,575 – 30,600 mm.
Diameters of openings of nests of pushers:
– nominal:	35,000 – 35,030 mm;
– repair:	35,500 – 35,530 mm.
Diameters of openings of the directing valves:
– nominal:	8,000 – 8,035 mm;
– repair:	8,263 – 8,288 mm.
Diameters of nests of vortex combustion chambers (see rice. The sizes of a nest of the vortex combustion chamber in a head of the block of cylinders):
– nominal:
• size A:	31,250 – 31,280 mm;
• size B:	27,530 – 27,560 mm;
– repair:
• size A:	31,550 – 31,580 mm;
• size B:	27,830 – 27,960 mm.
Height of nests of vortex combustion chambers C (see rice. The sizes of a nest of the vortex combustion chamber in a head of the block of cylinders):
– nominal:	4,983 – 5,034 mm;
– repair:	5,223 – 5,284 mm.

Laying of a head of the block of cylinders

Thickness of laying of a head of the block of cylinders is selected depending on a vystupaniye of pistons over the top plane of the block of cylinders, and value of the most acting piston is taken into account.

Thickness of laying is identified on the corresponding designation:

– for blocks of cylinders with nominal diameters of cylinders: laying has cuts;
– for blocks of cylinders with repair diameters of cylinders (+0,5 or +1,0): laying has an opening.

Designation of laying of a head of the block of cylinders

Vystupaniye of the piston (mm)	Designation of laying of a head on the block of cylinders with diameters of cylinders
Vystupaniye of the piston (mm)	nominal	repair
0,500 – 0,680	2 cuts	2 openings
0,681 – 0,740	3 cuts	3 openings
0,741– 0,840	4 cuts	4 openings

Installation method: laying of a head of the block of cylinders is established by the inscription "OBEN-TOP" in the direction of a head (the inscription has to be visible after laying is installed on the block of cylinders).

Combustion chambers

Vortex combustion chambers, steel, inserted into a head of the block of cylinders and fixed by means of a steel ball.

Camera type: vortex Ricardo Comet Mark V.
Vystupaniye of combustion chambers from the lower plane of a head of the block of cylinders: 0–0,061 mm.

Saddles of valves

Saddles of valves of a vpressovana in a head of the block of cylinders.

Sizes of saddles of valves

The size (mm) according to rice. Valve saddle sizes	Valve saddle
The size (mm) according to rice. Valve saddle sizes	inlet	final
Nominal diameter:
And	38,00 – 38,03	33, 00 – 33,03
In	8,3 – 8,5	8,8 – 9,0
1. repair diameter:
And	38,20 – 38,03	33,20 – 33,23
In	8,6 – 8,8	9,1 – 9,3
2. repair diameter:
And	38,40 – 38, 43	33,40 – 33,43
In	8,9 – 9,1	9,4 – 9,6

Springs of valves

Springs identical both for inlet, and for final valves. Free length: 43 mm.

Valves

Established in a head of the block of cylinders of the valve are put in action by cam-shaft cams through cylindrical pushers.

Sizes of valves

Type of the size	Valve
Type of the size	inlet	final
Diameter of a rod:
– nominal	7,82 – 7,97	7,81 – 7,96
– 1. repair	8,02 – 8,17	8,01 – 8,16
– 2. repair	8,22 – 8,37	8,21 – 8,36
Diameter of a plate	36,40 – 36,60	31,90 – 32,10
Valve length	107,05 – 107,15	109,15 – 109,25

Working gap of valves (in a cold state)

Gap of inlet valves: 0,35 ± 0,05 mm.

Gap of final valves: 0,50 ± 0,05 mm.

Adjustment of a gap of valves: selection of thickness of the adjusting plates located in deepening of pushers.

Range of adjusting plates on thickness: 3,00–4,75 mm.

Difference on thickness of adjusting plates: 0,05 mm.

Pushers

Outer diameter:

– nominal: 34,950–34,975 mm;
– repair: 35,450–35,475 mm.