Ford Sierra

1982-1993 of release

Repair and car operation

3.2.1.2.2. Head of the block of cylinders

GENERAL INFORMATION

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

Sizes of a saddle of the valve

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

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

Laying of a head of the block of cylinders

The thickness of laying of a head of the block of cylinders steals up 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 consideration.

The 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)	the nominal	the 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 "OBEN-TOP" inscription in the head direction (the inscription should be visible after laying is established on the block of cylinders).

Combustion chambers

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

Chamber type: vortical Ricardo Comet Mark V.
Vystupaniye of combustion chambers from the bottom plane of a head of the block of cylinders: 0–0,061 mm.

Saddles of valves

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

Sizes of saddles of valves

The size (mm) according to fig. Sizes of a saddle of the valve	Valve saddle
	the inlet	the 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	the inlet	the final
Diameter of a rod:
– the nominal	7,82-7,97	7,81-7,96
– 1. the repair	8,02-8,17	8,01-8,16
– 2. the repair	8,22-8,37	8,21-8,36
Diameter of a plate	36,40-36,60	31,90-32,10
Length of the valve	107,05-107,15	109,15-109,25

Working gap of valves (in a cold condition)

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

External diameter:

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