3.2.1. A technical characteristics

THE GENERAL DATA

ENGINES

Head of the block of cylinders

The head is executed from an aluminium alloy and has the inserted saddles of valves. In the top part of a head the camshaft is established.

Nominal height	157,40 – 157,75 mm (measurement is carried out between a surface of connection of a head and a surface on a diameter of a condensing ring of a camshaft) (fig. the Place of measurement of height of a head of the block of cylinders and a sign перешлифованной heads see)
The maximum admission неплоскостности the bottom surface of a head	0,07 mm
Repolishing	As much as possible 0,4 mm concerning the measured nominal height
The prevention After перешлифовывания the bottom surface of a head it is necessary to execute following actions:       – Grinding of nests of valves;       – Replacement of vortical chambers by chambers of the corresponding sizes and their correct installation;       – Installation under springs of valves of compensatory linings in the thickness of 0,4 mm. The pereshlifovannaja head is designated by letter R which has been beaten out in the corresponding place of a head (fig. the Place of measurement of height of a head of the block of cylinders and a sign перешлифованной heads see).
Facet of inlet valves	0,9 – 1,45 mm
Facet of final valves	0,5 – 1,05 mm
Выступание pistons over the block of cylinders	0 – 0,03 mm

Vortical chambers

In engines pistons under licence Ricardo Comet V are used.

Выступание vortical chambers	0 – 0,03 mm
Diameter of an adjusting ball	3,0 mm
The size of the vortical chamber:
– Diameter of a flange:
• the sizes nominal	32,05 – 32,25 mm
• 1st size repair	32,45 mm
• 2nd size repair	32,65 mm
• the admission	0,099-0,060 mm
– A thickness of a flange:
• the sizes nominal	4,0 – 4,1 mm
• 1st size repair	4,2 mm
• 2nd size repair	4,3 mm
• the admission	0,020-0,025 mm
– Diameter расточки heads:
• the sizes nominal	32,0 – 32,2 mm
• 1st size repair	32,4 mm
• 2nd size repair	32,6 mm
• the admission	0,039 0 mm
– Depth расточки heads:
• the sizes nominal	3,9 – 4,0 mm
• 1 й the size repair	4,1 mm
• 2nd size repair	4,2 mm
• the admission	0,02-0,04 mm

Directing valves

Directing valves are made of a brass. As the spare parts, directing are delivered the repair sizes.

The sizes of directing valves (fig. the Sizes of directing plugs of valves see):
– Diameter расточки in a head (f):
• the sizes nominal	14,02 – 14,13 mm
• 1st size repair	14,29 mm
• 2nd size repair	14,59 mm
• the admission	0  -0,011 mm
– External diameter of the directing plug (g):
• the sizes nominal	13,981 – 14,051 mm
• 1st size repair	14,211 mm
• 2nd size repair	14,511 mm
• the admission	0,032 0 mm
– Length of the directing plug (h)	52 mm
• the sizes nominal	52 mm
• the admission	± 0,25 mm
– Internal diameter of the directing plug ():
• the sizes nominal	8,02 mm
• the admission	0 0,2 mm
– Distance between a surface of a lining of a head of the block of cylinders and directing (j):
• the sizes nominal	36,50 mm
• the admission	± 0,50 mm

Saddles of valves

Pig-iron saddles of valves the plug-in. The corner прилегания saddles of inlet and final valves makes 90 °.

Valves

The valves fixed in a head, are put in action by a camshaft through pushers. Rods of inlet valves are chromeplated.

Adjustment of a working backlash is carried out by installation on pushers of corresponding adjusting plates.

The thickness of adjusting plates is resulted in the characteristic of pushers.

The sizes of saddles of inlet valves (fig. the Sizes of saddles of valves see):
– External diameter of a saddle ():
• the sizes nominal	40,161 – 40,361 mm
• 1st size repair	40,461 mm
• 2nd size repair	40,661 mm
• the admission	0  -0,025 mm
– Diameter расточки in a head (b):
• the sizes nominal	40,0 – 40,2 mm
• 1st size repair	40,3 mm
• 2nd size repair	40,5 mm
• the admission	0  -0,025 mm
– Saddle height ():
• the sizes nominal	6,25 – 6,45 mm
• 1st size repair	6,45 mm
• 2nd size repair	6,45 mm
• the admission	0  -0,1 mm
– Depth расточки in a head (d):
• the sizes nominal	8,267 – 8,467 mm
• 1st size repair	8,467 mm
• 2nd size repair	8,467 mm
• the admission	± 0,015 mm
The sizes of saddles of final valves (fig. the Sizes of saddles of valves see):
– External diameter of a saddle ():
• the sizes nominal	34,137 – 34,337 mm
• 1st size repair	34,467 mm
• 2nd size repair	34,637 mm
• the admission	0  -0,025 mm
– Diameter расточки in a head (b):
• the sizes nominal	34,0 – 34,2 mm
• 1st size repair	34,3 mm
• 2nd size repair	34,5 mm
• the admission	± 0,025 mm
– Saddle height ():
• the sizes nominal	6,05 – 6,25 mm
• 1st size repair	6,25 mm
• 2nd size repair	6,45 mm
• the admission	0 – 0,1 mm
– Depth расточки in a head (d):
• the sizes nominal	8,15 – 8,35 mm
• 1st size repair	8,35 mm
• 2nd size repair	8,35 mm
• the admission	± 0,015 mm
The sizes of valves:
– The inlet valve:
• length	112,2 mm
• diameter of a rod	8,005 mm
• diameter of a plate	38,5 mm
• a corner прилегания	90 °
• a facet	0,5 – 1,05 mm
– The final valve:
• diameter of a rod	7,985 mm
• diameter of a plate	33,0 mm
• a corner прилегания	90 °
• a facet	0,9 – 1,45 mm
Valves engines XUD 9ТЕ (valves special, they have an additional sealant of a rod):
– The inlet valve:
• length	112,4 mm
• diameter of a rod	8,0 mm
• diameter of a plate	38,5 mm
• a corner прилегания	90 °
• a facet	0,5 – 1,05 mm
– The final valve:
• length	109,55 mm
• diameter of a rod	8,0 mm
• diameter of a plate	33,0 mm
• a corner прилегания	90 °
• a facet	0,9 – 1,45 mm
Working backlash of valves (at the cold engine):
– The inlet valve	0,15 mm
– The final valve	0,30 mm
– The admission	± 0,04 mm

Springs of valves

It is used on two springs on the valve. Inlet and final valves have identical springs.

Spring internal:
– Diameter	19,5 mm
– Height / under loading	38,4 mm / 85 Н
– Height / under loading	29,3 mm / 237 Н
Spring external:
– Diameter	29 mm
– Height / under loading	42,4 mm / 180 Н
– Height / under loading	33,3 mm / 450 Н

Pushers

Nests of pushers are executed directly in a head. The working backlash of the valve is regulated by placing on a pusher of an adjusting plate of the corresponding sizes.

Diameter of plates	13,5 mm
Thickness of plates (mm)	1,650, 1,725, 1,800, 1,900, 1,975, 2,050, 2,125, 2,225 to 3,025 everyone 0,025, 3,100, 3,175, 3,250, 3,325 to 4,000 everyone 0,025

Lining of a head of the block of cylinders

Mark	Reinz
Designation	On linings two kinds of the signs designating their mission and a thickness (fig. Identification of a lining of a head of the block of cylinders see) are executed
The designation defining the engine (and, fig. Identification of a lining of a head of the block of cylinders see):
– XUD 9	Without cut
– XUD 7TE	2 cuts
The designation defining a thickness (b, fig. Identification of a lining of a head of the block of cylinders see):
– XUD 9	2 cuts of 1,61 mm
– XUD 7TE	2 cuts of 1,65 mm
– XUD 7TE	3 cuts of 1,80 mm
In engines XUD 9ТЕ the special lining of a head of the block of cylinders is applied. Identification – 3 cuts executed under cuts of a designation of a thickness.

The block of cylinders of the engine

The block of cylinders of the engine is made of pig-iron. Cylinders are executed directly in the block. In engines XUD 7TE the cooling liquid circulates between cylinders, in engines XUD 9 between cylinders special channels are executed.

Height of the block of cylinders of engine XUD 9ТЕ	303 mm
Diameter of cylinders:
– Engine XUD 7TE:
• 1st size nominal	80,000 – 80,018 mm (without a designation)
• 2nd size nominal	80,030 – 80,048 mm (designation А1)
• 1st size repair	80,200 – 80, 218 mm (designation R1)
• 2nd size repair	80,500 – 80,518 mm (designation R2)
• 3rd size repair	80,800 – 80,818 mm (designation R3)
– Engine XUD 9:
• 1st size nominal	83,000 – 83,018 mm (without a designation)
• 2nd size nominal	83,030 – 83,048 mm (designation А1)
• 1st size repair	83,200 – 83,218 mm (designation R1)
• 2nd size repair	83,500 – 83,518 mm (designation R2)
• 3rd size repair	83,800 – 83,818 mm (designation R3)

KRIVOSHIPNO-SHATUNNYJ THE MECHANISM

Cranked shaft

The cranked shaft is made of spheroidal pig-iron, leans against five radical bearings and has counterbalances. Radical and шатунные necks are subjected обкатке and induction training.

Diameter of radical necks:
– The size nominal	59,981 – 60,000 mm
– 1st size repair	59,681 – 59,700 mm
Diameter шатунных necks:
– The size nominal	49,984 to 50,000 mm
– 1st size repair	49,684 to 49,700 mm
Width of a neck №2 engines XUD 9:
– The size nominal	26,60 to 26,65 mm
– 1st size repair	26,80 to 26,85 mm
– 2nd size repair	26,90 to 26,95 mm
– 3rd size repair	27,00 to 27,05 mm
Width of a neck №2 engines XUD 7TE:
– The size nominal	25,70 to 25,75 mm
– 1st size repair	25,90 to 25,95 mm
– 2nd size repair	26,00 to 26,05 mm
– 3rd size repair	27,00 to 27,05 mm
Thickness of persistent half rings of engines XUD 9:
– The size nominal	2,305 ± 0,025 mm
– 1st size repair	2,405 ± 0,025 mm
– 2nd size repair	2,455 ± 0,025 mm
– 3rd size repair	2,505 ± 0,025 mm
Thickness of persistent half rings of engines XUD 7TE:
– The size nominal	1,855 ± 0,025 mm
– 1st size repair	1,955 ± 0,025 mm
– 2nd size repair	2,005 ± 0,025 mm
– 3rd size repair	2,055 ± 0,025 mm
Sealing ring from outside a camshaft drive	42 х 62 х 8 mm
Sealing ring from outside a flywheel	90 х 110 х 10 mm
Axial backlash of a cranked shaft	0,07 to 0,32 mm
Persistent half rings are placed on the radical bearing №2.
Loose leaves of radical bearings:
– A nominal thickness	1,842 ± 0,003 mm
– The repair size	1,992 ± 0,003 mm

Flywheel

The flywheel is fixed восемью by bolts.

Number of teeths of a gear wreath: 136.

Rods

Rods are shaped from a steel.

Internal diameter of the top head of a rod (for расточки after fastening):
– Engine XUD 9	25,007 to 25,020 mm
– Engine XUD 7ТЕ	28,007 to 28,020 mm
Distance between rod axes	145 ± 0,025 mm
Loose leaves of rods:
– A nominal thickness	1,827 ± 0,003 mm
– The repair size	1,977 ± 0,003 mm

Pistons

Pistons are made of an aluminium and silicon alloy. They are connected to rods by means of the fingers fixed by two spring rings.

Diameter of pistons:
– Engine XUD 7TE:*
• 1st size nominal	79,93 ± 0,009 mm (without a designation)
• 2nd size nominal	79,96 ± 0,009 mm (designation А1)
• 1st size repair	80,13 ± 0,009 mm (designation R1)
• 2nd size repair	80,43 ± 0,009 mm (designation R2)
• 3rd size repair	80,73 ± 0,009 mm (designation R3)
– Engine XUD 9:*
• 1st size nominal	82,93 ± 0,009 mm (without a designation)
• 2nd size nominal	82,96 ± 0,009 mm (designation А1)
• 1st size repair	83,13 ± 0,009 mm (designation R1)
• 2nd size repair	83,43 ± 0,009 mm (designation R2)
• 3rd size repair	83,73 ± 0,009 mm (designation R3)

* Diameter is measured on distance of 25 mm (for engines XUD 9) and 2,5 mm (for engines XUD 7ТЕ) from the piston bottom perpendicularly to a finger axis.

Piston fingers

The piston finger is fixed in a rod and the piston. It is fixed by means of two spring rings.

Diameter:
– Engine XUD 9	25 mm
– Engine XUD 7ТЕ	28 mm
Finger backlash in the piston	0,003 mm to 0,014 mm

Piston rings

Each piston has three piston rings.

Backlash in the lock:
– компрессионное a ring	0,20 to 0,40 mm
– A sealing ring	0,15 to 0,35 mm
– маслосъемное a ring	0,10 to 0,35 mm
Thickness компрессионного rings in engines XUD 9ТЕ	3,5 mm

SYSTEM GAZORASPREDELENIJA

System work timing the camshaft placed in a head which rotates in three bearings operates and is put in action by a gear belt. Valves are put in action by a camshaft through the pushers supplied with adjusting plates.

Camshaft

The pig-iron camshaft is fixed in a head, rotates in three bearings and is put in action by a gear belt.

Engine XUD camshaft 7ТЕ has special camber between cams of 1st cylinder.

Diameter of bearings:
– The bearing №1	27,5 mm (from outside a flywheel)
– The bearing №2	28,00 mm
– The bearing №3	28,5 mm
Some camshafts have bearings with diameter increased by 0,5 mm. Such camshafts are accordingly designated: between cams of 1st cylinder yellow colour draws a ring. Heads in which camshaft bearings have diameter increased by 0,5 mm, are designated by the beaten out figure 1.
Axial backlash	0,025 to 1,114 mm
In that part of a camshaft which should be from outside a drive, there is an inscription "DIST".

Theoretical phases of distribution with a zero control backlash of valves

Engine XUD 9, XUD 9ТЕ:
– Advancing OZD	44°30'
– Delay ZZD	83°30'
– Advancing OZW	89°30'
– Delay ZZW	46°30'
Engine XUD 7TE:
– Advancing OZD	51°30'
– Delay ZZD	76°30'
– Advancing OZW	89°30'
– Delay ZZW	46°30'

OZD, ZZD – accordingly opening and closing of the inlet valve.
OZW, ZZW – accordingly opening and closing of the final valve.

Gear belt

Mark: Uniroyal Powergrip or Pirelli Isoran.

The belt tension provides the roller tension device.

Periodicity of replacement of a belt: each 75000 km.

GREASING SYSTEM

Greasing under pressure provides шестеренчатый the oil pump put in action by a chain from a cranked shaft.

The heat exchanger oil-cooling a liquid is present at all types of engines. Atomizers of dispersion of oil on the bottoms of pistons, and also a contour of greasing of a turbo-supercharging are in engine XUD 7ТЕ.

The oil pump

Type	шестеренчатый
Pressure of oil:
– Idling	0,2 МПа
– At 2000 rpm	0,34 to 0,37 МПа
– At 4000 rpm	0,38 to 0,50 МПа
Pressure of opening редукционного the valve	0,40 МПа
The pressure gauge:
– Deenergizing of a control bulb	0,08 МПа
– Fire of a control bulb	0,058 to 0,044 МПа

The oil filter

The oil filter with a replaced element has connected bypass the valve (0,1 МПа).

Mark and type: Purflux LS 468 A or Mann 674 0258.035.

Engine oil

Recommended type	API SF/CD, MIL-L-2104 C or 46 152, CCMC PD1, SAE 10W/40, 15W/30 or 15W/40
Quantity of oil	4,5 дм3 0,5 дм3 (the oil filter)
Periodicity of replacement of oil together with the filter	Each 10 000 km

COOLING SYSTEM

The engine is cooled under pressure (0,1 МПа) a mix of water and a special nonfreezing liquid.

Into structure of system of cooling enter: a radiator, the pump of a cooling liquid, the broad tank connected to a radiator, two fans supplied with electric motors, the thermostat and the temperature gauge.

The cooling contour provides heating of fuel (in some versions).

The pump of a cooling liquid

The centrifugal pump of a cooling liquid is fixed in the case and put in action by a gear belt.

Radiator

The radiator has a core of a horizontal current.

Mark: Chausson.

The thermostat

Mark: Calorstat.

Temperature of the beginning of opening	88 ° WITH
Temperature of full opening	100 ° WITH

Fans

Mark: АОР.

Before a radiator two fans supplied with electric motors are established.

Functioning: simultaneous, with two speeds operated the two-level gauge of temperature.

Inclusion and switching-off temperature:
– 1 speed:
• 93/88 ° WITH	In engines XUD 7ТЕ and XUD 9 with number of the chassis to 8 274 818
• 97/92 ° WITH	In engines XUD 9 with number of the chassis from 8 274 819
– 2 speed:
• 97/92 ° WITH	In engines XUD 7ТЕ and XUD 9 with number of the chassis to 8 274 818
• 101/96 ° WITH	In engines XUD 9 with number of the chassis from 8 274 819

The temperature gauge

It is the gauge of the raised temperature of a cooling liquid.

Temperature of inclusion of a control bulb: 105 ° With.

Cooling liquid

Recommended type	Mix of water and nonfreezing liquid in a proportion 1:1 (to-17 °)
Quantity	7,8 l
Periodicity of replacement of a cooling liquid and washing of a contour of cooling	Each 2 years

THE POWER SUPPLY SYSTEM

Fuel giving is provided with the distributive pump of a high pressure and an atomizer, and in engines XUD 7ТЕ – in addition турбокомпрессор.

The air filter

Kind	The dry filter
Mark and type	Permabit FA 1526 or Mann

Fuel tank

Volume	70 l
Fuel	The diesel

System of injection Bosch

Engine XUD 7TE:
– Type of the fuel pump	EP-VE 4/8F 2150 R 316
– An atomizer	DNOSD 289
– Type	KCA 17 S 42
– Adjustment	13,0 to 13.5 МПа
– The filter	Purflux
– Initial warming up:
• candles накаливания	Bosch 0250 201 01, Beru 0100 22 133
• resistance at temperature 20 ° With	0,3 to 0,4 Ohm
• heating time	8 сек
– Adjustment:
• pump installation	Before ВМТ the piston №4 for lifting поршнераспределителя 0 ± 0,03 mm
• dynamic installation	At 750 to 800 rpm 14 °
• number of turns of idling	750 to 800 rpm
• the increased number of turns of idling	950 ± 50 rpm
Engine XUD 9:
– Type of the fuel pump	EP-VE 419F 2300 R
– An atomizer	2722-2 DNOSD 287
– Type	KCA 17 S 42
– Adjustment	13,0 to 13.5 МПа
– The filter	Purflux
– Initial warming up:
• ссвечи накаливания	Bosch 0250 201 01, Beru 0100 22 133
• ссопротивление at temperature 20 ° With	0,3 to 0,4 Ohm
• heating time	8 сек
– Adjustment:
• pump installation	Before ВМТ the piston №4 for lifting поршнераспределителя 0,9 ± 0,03 mm
• dynamic installation	At 750 to 800 rpm 15 ° ± 1 °
• number of turns of idling	750 to 800 rpm
• the increased number of turns of idling	950 ± 50 rpm

System of injection Roto Diesel

Engine XUD 7TE:
– Type of the fuel pump	DPCR 8443 B 451 C or 452 C
– An atomizer	RDNOSD 6862C
– Type	LCR 67307
– Adjustment	13,0 ± 0,5 МPа
– The filter	Roto Diesel
– An element	CAV
– Initial warming up:
• candles накаливания	Bosch 0250 201 01900, Beru 0100 22 133
• resistance at temperature 20 ° With	0,3 to 0,4 Ohm
• heating time	8 сек
– Adjustment:
• pump installation	Before ВМТ the piston №4 for measured by the indicator of hour type of lifting of the piston of the pump fixed in the pump of 0,01 mm
• dynamic установка*	9 °
• dynamic installation at 750 – 800 rpm	15 °
• number of turns of idling	750 – 800 rpm
• the increased number of turns of idling	950 ± 50 rpm
Engine XUD 9:
– Type of the fuel pump	DPCR 8443 B 380 A or 381 B
– An atomizer	RDNOSD 6751C
– Type	LCR 67307
– Adjustment	11,5 ± 0,5 МPа
– The filter	Roto Diesel
– слемент	CAV
– Initial warming up:
• ссвечи накаливания	Bosch 0250 201 01900, Beru 0100 22 133
• ссопротивление at temperature 20 ° With	0,3 to 0,4 Ohm
• heating time	8 сек
– Adjustment:
• pump installation	Before ВМТ the piston №4 for measured by the indicator of hour type of lifting of the piston of the pump fixed in the pump of 0,01 mm
• dynamic установка*	15 °
• dynamic installation at 750 – 800 rpm	15 °
• number of turns of idling	750 – 800 rpm
• the increased number of turns of idling	950 ± 50 rpm

* Value for fast check by means of the special diagnostic device.

The fuel pump of a high pressure on engines XUD 9ТЕ

Mark and type	Bosch VER 445
Installation static	Piston stroke of the distributor of 0,66 mm in position ВMТ of the cylinder №4
Installation dynamical (the engine is heated-up)	11 ° ± 1 ° at 800 rpm
Number of turns idling:
– Without air-conditioning	750 ± 50 rpm
– With air-conditioning	800 ± 50 rpm
The maximum number of turns without loading	5100 ± 80 rpm
Number of turns idling with the raised number of turns (the engine cold)	950 ± 50 rpm

The complete set of atomizers on engines XUD 9ТЕ

Mark and type	Bosch KCA 17S42
Atomizer sprays on engines XUD 9ТЕ:
– Mark and type	Bosch DNOSD 299
Pressure of opening of an atomizer	17,5 МПа

Турбокомпрессор

Турбокомпрессор provides additional giving of air in the engine. It has a radiator of air which warms up air submitted to the engine.

Mark and type	Garrett T2 or KKK K 14
Pressure of a compression:
– At 2000 rpm	70 ± 5 кПа
– At 4300 rpm	85 ± 5 кПа
Турбокомпрессор on engines XUD 9ТЕ
Mark and type	Garrett T2 or KKK К14
Pressure of a compression:
– At 2000 rpm	70 ± 5 кПа
– At 3000 rpm	100 ± 5 кПа

THE TIGHTENING MOMENTS

Head of the block of cylinders (new bolts and linings):
– A stage 1	30 Nanometers
– A stage 2	70 Nanometers
– A stage 3	To tighten on a corner 120 °
Plate of a framework of consolidation from outside a distributive drive	15 Nanometers
Fastening of the oil pallet to the block	20 Nanometers
Covers of bearings of a camshaft	15 – 17,5 Nanometers
Covers of rods:
– 1 stage	Screwing up by the moment of 40 Nanometers
– 2 stage	Easing of fastening of nuts
– 3 stage	Screwing up by the moment of 20 Nanometers
– 4 stage	доворачивание on a corner 70 °
Fastening of covers of radical bearings to the block of cylinders	70 Nanometers
Cover of a head of the block of cylinders	10 Nanometers
Atomizer fastening to a head of the block of cylinders	90 Nanometers
Camshaft pulley	35 to 40 Nanometers
Pulley of the fuel pump of a high pressure	50 Nanometers
Pulley of a cranked shaft	40 Nanometers 60 °
Pump pulley поддавления	35 Nanometers
The tension device of a gear belt	15 Nanometers
The oil heat exchanger	65 Nanometers
Flywheel	50 Nanometers
The pump of a cooling liquid	15 Nanometers
The oil pump	20 Nanometers
The left arm of the engine:
– Lateral nuts	17,5 Nanometers
– The central nut	35 Nanometers
The right arm of the engine:
– A nut about a body	27,5 Nanometers
The bottom arm of the engine:
– A nut about a body	55 Nanometers
– A nut about the engine	35 Nanometers

CHANGES IN ENGINES XUD 7TE, XUD 9 AND XUD 9TE

Lining of a head of the block of cylinders

Some engines have the block of cylinders designated by a symbol "In" which is characterised by a ledge of pistons over the edge of cylinders equal or big 0,84 mm. In them it is necessary to establish necessarily a lining of a head in the thickness of 1,83 mm which is designated by four cuts.

Springs of valves

Since December, 1988 valves are equipped only with one spring which has replaced knot from two springs.

Diameter	29 mm
Height under loading 320 Н	42,4 mm
Height under loading 550 Н	33,0 mm
Diameter of a wire	3,8 mm
Colour of a designation	Blue, colours of "a sea wave"

Saddles and final valves

With a view of unification engines XUD 7Т and XUD 9 are equipped by the same nests of final valves, as well as in engine XUD 9ТЕ.

Application of this updating has led to that deepening of a nest of the final valve concerning a surface of connection of a head of the block of cylinders became equal 2,5 mm instead of former 2 mm, and also the thickness of a plate of the valve for preservation of former degree of compression has accordingly increased.

Heads of new type are identified by means of apertures in diameter of 9 mm (instead of apertures in diameter of 7 mm) in the ledges located over candles накаливания.

Since January, 1992 engine XUD 9 with the modified head of the block of cylinders has designation XUD 9A/L.

Components of both types of heads of the block of cylinders are not interchangeable.

System timing

Engines were gradually equipped with gear belts from materials HSN (Hydrogene Sature Nitrile) which are characterised by the raised stability on influence of oils and the raised temperature.

These belts have designation HSN.

In case of belt replacement it is necessary to establish belt HSN necessarily.

Mark and type: Pirelli 136 RPP 254 or Gates HTD 58136x1.

Since January, 1990 in cars with system of a steering without the hydraulic booster диафрагменные vacuum pumps are gradually replaced on лопастные rotational pumps with a drive directly from a camshaft. As a result of this updating the camshaft has been changed – its length for maintenance of a drive of the pump of low pressure has been increased.

Since serial number 70 491 894 vacuum pump on the camshaft end also is established in cars with system of a steering with the hydraulic booster.

In cars with air-conditioning the former decision is left.

Since model 1993 the thermostat 89 ° is replaced with the thermostat 83 °.

Since model 1993 former gauges of temperature are replaced on new with following characteristics:

1st step:
– Without air-conditioning	92,5 ° WITH
– With air-conditioning	90 ° WITH
2nd step:
– Without air-conditioning	97,5 ° WITH
– With air-conditioning	101 ° WITH

Турбокомпрессор

Since numbers of engines 1CV33-49714, 1CV35-67544, 1CV47-77513, 1CV48-20272, 1CV87-2457 fastening returnable маслопровода on турбокомпрессоре has been changed for improvement of tightness of connection. To change also has been subjected bringing маслопровод.

Separate parts of both types of fastening are not interchangeable.