Ford Sierra

4.2.1. Technical characteristics

THE GENERAL DATA

Engine type:
– Till December, 1986 (Sierra ' 83)	YТТ (Peugeot ХD2Р)
– Since January, 1987 (Sierra ' 87)	YТР
Diameter of the cylinder	94 mm
Piston stroke	83 mm
Working volume	2304 sm3
Pressure of compression:
– The nominal	2,5 МПа
– The minimum	2,0 МПа
– An admissible difference between cylinders	0,5 МПа
Rated power	49 kw (67 h.p.)
Nominal number of turns	4200 rpm
The maximum twisting moment	139 Nanometers
Number of turns at the maximum moment	2000 rpm

Block head цилинров

The head is executed from an easy alloy with the inserted chambers of combustion, saddles and directing valves.

Height of a head of the block of cylinders	90 ± 0,15 mm
The maximum size of regrinding of the bottom plane of a head of the block of cylinders	0,5 mm
Maximum неплоскостность the bottom plane of a head of the block of cylinders:
– The cross-section	0,1 mm
– On a diagonal	0,2 mm

Combustion chambers

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

Type of the chamber of combustion	Vortical Ricardo Comet Mark V
Diameter of a ball	3 mm
Выступание vortical chambers from the bottom plane of a head of the block of cylinders	0 – 0,03 mm

Saddles of valves

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

Corner of a working facet of a saddle of the valve:
– The inlet	120 °
– The final	90 °
Width of a working facet	2,2 – 2,5 mm
External diameter grew grey inlet valves:
– The nominal	42,275 – 43,325 mm
– The repair	42,475 – 42,525 mm
External diameter grew grey final valves:
– The nominal	36,275 – 36,525 mm
– The repair	36,475 – 36,525 mm

Directing valves

Directing valves запрессованы in a head of the block of cylinders also are identical both for inlet, and to final valves.

External diameter:
– The nominal	14,048-14,059 mm
– The first repair	14,280 – 14,290 mm
– The second repair	14,579-14,590 mm
Internal diameter	8,520 – 8,542 mm
Length	55 mm
Distance between a directing and bottom plane of a head of the block of cylinders	27,95 – 28,05 mm

The valve

The valve are established in a head of the block of cylinders vertically and in parallel each other (at right angle to the bottom plane of a head of the block of cylinders).

Diameter of a plate:
– The inlet valve	40,5 mm
– The final valve	33,5 mm
Diameter of a core:
– The inlet valve	8,473 – 8,495 mm
– The final valve	8,453 – 8,475 mm
The maximum backlash of the valve in the directing	0,15 mm
Corner of a working facet:
– The inlet valve	120 °
– The final valve	90 °
Full length of the valve	116,25 mm
Заглубление valves concerning the bottom plane of a head of the block of cylinders:	0,75-1,15 mm.
Working backlash of valves (at the cold engine)
Backlash of inlet valves	0,30 mm
Backlash of final valves	0,35 mm

Springs of valves

Are used on two springs on each valve, identical to inlet and final valves.

Free length:
– An internal spring	41,00 mm
– An external spring	44,6 mm
Length under loading 155 Н (15,8 kg):
– An internal spring	22 ± 0,5 mm
– An external spring	26 ± 0,5 mm
Diameter of a wire of a spring:
– An internal spring	2,3 mm
– An external spring	3,8 mm
Internal diameter:
– An internal spring	15,0 0 0,40 mm
– An external spring	23,2 0 0,40 mm
Installation method: the end of a spring with the compressed coils, should be from outside heads of the block of cylinders

Lining of a head of the block of cylinders

Linings of a head of the block of cylinders were made of a synthetic material and had originally (engines with number more low SН 79876) two thickness, and then (engines with number above SН 79876) three thickness. The thickness of a lining steals up depending on выступания pistons over the top plane of the block of cylinders of the engine. The thickness of a lining is identified on number of cuts on its edge.

Выступание pistons (engines with number more low SН 79876):
– Less than 0,84 mm	Lining in the thickness of 1,58 mm (a designation: 2 cuts)
– More than 0,84 mm	Lining in the thickness of 1,70 mm (a designation: 3 cuts)
Выступание pistons (engines with number above SН 79876):
– From 0,69 to 0,79 mm	Lining in the thickness of 1,53 mm (a designation: 2 cuts)
– From 0,79 to 0,89 mm	Lining in the thickness of 1,63 mm (a designation: 3 cuts)
– More than 0,89 mm	Lining in the thickness of 1,73 mm (a designation: 4 cuts)
As spare parts linings only new type (three thickness) are made