Ford Sierra

4.2.1.2. The Krivoshipno-shatunnyj mechanism

THE GENERAL DATA

Cranked shaft

The cranked shaft is shaped from a steel together with four counterbalances and leans against five radical bearings.
Axial люфт	0,08 – 0,29 mm
Diameters of radical necks:
– The nominal size	59,994-60,021 mm
– 1st repair size	59,694 – 59,721 mm
– 2nd repair size	59,494 – 59,521 mm
– 3rd repair size	59,194 – 59,221 mm
Length of radical necks:
– A lobby	38,40 – 38,55 mm
– The intermediate	30,40 – 30,60 mm
– Average	37,76 – 37.81 mm
– The back	37,84 – 38,04 mm
Backlash of necks in radical bearings	0,040 – 0.098 mm
Diameters шатунных necks:
– The nominal size	54,984 – 55,011 mm
– The repair size	54,684 – 54,711 mm
Length шатунных necks	36,00 – 36,10 mm
Thickness of persistent half rings:
– The nominal size	2,30 – 2,33 mm
– The repair size	2,50 – 2.53 mm

Radical loose leaves

These are thin-walled loose leaves with a cover from a steel sheet and an antifrictional material from a tsinko-aluminium alloy.
Width of loose leaves:
– Forward, average and back	29,80 mm
– The intermediate	21,80 mm

Rods

Rods are shaped from a steel and have двутавровый a profile in a cut and a straight line of a socket of the basis.
Distance between axes of apertures of a head and the basis	150 mm
Internal diameter of the plug of a head of a rod (after installation)	28,00,02 – 28,00,07 mm
Backlash шатунной necks in шатунном the bearing	0,040 – 0,098 mm

Shatunnye loose leaves

These are thin-walled loose leaves with a cover from a steel sheet and an antifrictional material from a tsinko-aluminium alloy.
Thickness of loose leaves:
– The nominal	1,819 ± 0,003 mm
– The repair	1,969 ± 0,003 mm
Width of loose leaves	29,0 mm

Pistons

Pistons are made of an aljuminievo-silicon alloy.
The maximum difference of weights of the complete set of pistons of the engine should not exceed 5 г
Installation method in the cylinder	Deepenings at the bottom of the piston (for plates of valves and the combustion chamber) should be from outside the fuel pump
Diameter of the piston (measured under an aperture of a piston finger and in parallel to an axis of this aperture)
– The nominal:
• group And	93,855 – 93,870 mm
• group In	93,870 – 93,885 mm
-1st repair size:
• group With	94,055 – 94,070 mm
• group D	94,070 – 94,085 mm
– 2nd repair size:
• group E	94,255 – 94,270 mm
• group F	94,270 – 94,285 mm
– 3rd repair size:
• group G	94,455 – 94,470 mm
• group N	94,470 – 94,485 mm
Выступание pistons in ВМТ over the top plane of the block of cylinders	0,54 – 0,89 mm
Piston backlash in the cylinder	0,130 – 0,160 mm

Piston fingers

The finger is made of a steel and superficially tempered.
The finger rotates in the piston and the plug of a head of a rod (a so-called floating finger) and is fixed from longitudinal moving by two spring lock rings
External diameter	27,994 – 28,000 mm

Piston rings

Each piston has three rings:
– The top	Sealing with the chromeplated, convex external working surface
– An average	Sealing with a conic external working surface
– The bottom	Маслосъемное type U-Flex
Installation method: concerns average and bottom rings, the inscription of "Torahs" (top) is directed towards a piston bottom.
Width of the lock of a ring established in the cylinder:
– The top ring	0,40 – 0,65 mm
– An average ring	0,35 – 0,60 mm
– The bottom ring	0,15 – 0,30 mm
Thickness of rings:
– The top	1,978 – 1,990 mm
– An average	1,978 – 1,990 mm
– The bottom	4,478 – 4,490 mm
Backlash of rings in piston flutes	0,032 – 0,090 mm

System timing

The system timing contains:

  – A cam-shaft established in the block of cylinders;
  – Pushers;
  – Cores of pushers;
  – Levers of valves and the valve.

The cam-shaft is put in action двухрядной by a chain from a cranked shaft.

Distribution phases

Distribution phases are defined at a zero backlash of valves for lifting of final and inlet valves equal 0,60 mm.
OZD	12 ° before ВМТ
ZZD	40 ° after НМТ
OZW	56 ° before НМТ
ZZW	12 ° after ВМТ
OZD and ZZD	Accordingly opening and closing of the inlet valve
OZW and ZZW	Accordingly opening and closing of the final valve
Working backlash of valves (in a cold condition):
– A backlash of inlet valves	0,30 mm
– A backlash of final valves	0,35 mm

Cam-shaft

The pig-iron cam-shaft has cams with the improved thermal characteristics and is established in the block of cylinders on three bearings.

Diameters of necks	41,925 – 41,950 mm
Radial люфт	0,05 – 0,11 mm
Axial люфт	0,05 – 0,15 mm
Lifting of cams (at a zero backlash of valves):
– The inlet:	9,12 mm
– The final:	9,12 mm