Engines
Cylinder head
The head is made of aluminum alloy and has inserted valve seats. A camshaft is installed at the top of the head.
Rated Height | 157.40 - 157.75 mm (the measurement is made between the head connection surface and the surface across the camshaft seal ring) (see fig. Place of measuring the height of the cylinder head and the sign of the reground head) |
Maximum flatness tolerance of the bottom surface of the head | 0.07mm |
regrinding | max. 0.4 mm in relation to the measured nominal height |
Warning! After grinding the bottom surface of the head, do the following: – grinding of valve seats; - replacement of vortex chambers with chambers of appropriate sizes and their correct installation; – installation of compensatory gaskets 0.4 mm thick under the valve springs. The reground head is marked with the letter R stamped in the corresponding place of the head (see fig. Place of measuring the height of the cylinder head and the sign of the reground head). | |
Intake valve chamfer | 0.9 - 1.45 mm |
Exhaust valve chamfer | 0.5 - 1.05 mm |
Piston protrusion above the cylinder block | 0 - 0.03 mm |
Vortex chambers
The engines use pistons under license from Ricardo Comet V.
Protrusion of vortex chambers | 0 - 0.03 mm |
Set ball diameter | 3.0 mm |
Swirl chamber size: | |
– flange diameter: | |
• nominal dimensions | 32.05 - 32.25 mm |
• 1st repair size | 32.45 mm |
• 2nd repair size | 32.65 mm |
• admission | +0.099 -0.060 mm |
– flange thickness: | |
• nominal dimensions | 4.0 - 4.1 mm |
• 1st repair size | 4.2mm |
• 2nd repair size | 4.3mm |
• admission | +0.020 -0.025 mm |
– head bore diameter: | |
• nominal dimensions | 32.0 - 32.2 mm |
• 1st repair size | 32.4mm |
• 2nd repair size | 32.6 mm |
• admission | +0.039 0 mm |
– head boring depth: | |
• nominal dimensions | 3.9 - 4.0 mm |
• 1st repair size | 4.1 mm |
• 2nd repair size | 4.2 mm |
• admission | +0.02 -0.04 mm |
Valve guides
The valve guides are made of brass. As spare parts, guides are supplied in oversized sizes.
Directional valve dimensions (see fig. Valve guide dimensions): | |
- head bore diameter (f): | |
• nominal dimensions | 14.02 - 14.13 mm |
• 1st repair size | 14.29 mm |
• 2nd repair size | 14.59 mm |
• admission | 0 -0.011 mm |
– outer diameter of the guide bush (g): | |
• nominal dimensions | 13.981 - 14.051 mm |
• 1st repair size | 14.211 mm |
• 2nd repair size | 14.511 mm |
• admission | +0.032 0 mm |
– guide sleeve length (h) | 52 mm |
• nominal dimensions | 52 mm |
• admission | ±0.25mm |
– inner diameter of the guide sleeve (To): | |
• nominal dimensions | 8.02 mm |
• admission | 0 +0.2 mm |
- the distance between the surface of the cylinder head gasket and the guide (j): | |
• nominal dimensions | 36.50 mm |
• admission | ±0.50mm |
Valve seats
Cast iron valve seats are plug-in. The angle of contact of the inlet and outlet valve seats is 90°.
Valves
Valves fixed in the head are actuated by the camshaft through pushers. The intake valve stems are chrome plated.
Adjustment of the working clearance is carried out by installing appropriate adjusting plates on the pushers.
The thickness of the adjusting plates is given in the characteristics of the pushers.
Inlet valve seat dimensions (see fig. Valve seat dimensions): | |
– outside diameter of the seat (A): | |
• nominal dimensions | 40.161 - 40.361 mm |
• 1st repair size | 40.461 mm |
• 2nd repair size | 40.661 mm |
• admission | 0 -0.025 mm |
- head bore diameter (b): | |
• nominal dimensions | 40.0 - 40.2 mm |
• 1st repair size | 40.3 mm |
• 2nd repair size | 40.5 mm |
• admission | 0 -0.025 mm |
- saddle height (With): | |
• nominal dimensions | 6.25 - 6.45 mm |
• 1st repair size | 6.45 mm |
• 2nd repair size | 6.45 mm |
• admission | 0 -0.1 mm |
– boring depth in the head (d): | |
• nominal dimensions | 8.267 - 8.467 mm |
• 1st repair size | 8.467 mm |
• 2nd repair size | 8.467 mm |
• admission | ±0.015mm |
Exhaust valve seat dimensions (see fig. Valve seat dimensions): | |
– outside diameter of the seat (A): | |
• nominal dimensions | 34.137 - 34.337 mm |
• 1st repair size | 34.467 mm |
• 2nd repair size | 34.637 mm |
• admission | 0 -0.025 mm |
- head bore diameter (b): | |
• nominal dimensions | 34.0 - 34.2 mm |
• 1st repair size | 34.3mm |
• 2nd repair size | 34.5mm |
• admission | ±0.025mm |
- saddle height (With): | |
• nominal dimensions | 6.05 - 6.25 mm |
• 1st repair size | 6.25mm |
• 2nd repair size | 6.45 mm |
• admission | 0 - 0.1 mm |
– boring depth in the head (d): | |
• nominal dimensions | 8.15 - 8.35 mm |
• 1st repair size | 8.35mm |
• 2nd repair size | 8.35mm |
• admission | ±0.015mm |
Valve sizes: | |
- inlet valve: | |
• length | 112.2 mm |
• stem diameter | 8.005 mm |
• plate diameter | 38.5mm |
• contact angle | 90° |
• chamfer | 0.5 - 1.05 mm |
- Exhaust valve: | |
• stem diameter | 7.985 mm |
• plate diameter | 33.0 mm |
• contact angle | 90° |
• chamfer | 0.9 - 1.45 mm |
Valves for XUD 9TE engines (valves are special, they have an additional stem seal): | |
- inlet valve: | |
• length | 112.4 mm |
• stem diameter | 8.0mm |
• plate diameter | 38.5mm |
• contact angle | 90° |
• chamfer | 0.5 - 1.05 mm |
- Exhaust valve: | |
• length | 109.55 mm |
• stem diameter | 8.0mm |
• plate diameter | 33.0 mm |
• contact angle | 90° |
• chamfer | 0.9 - 1.45 mm |
Valve clearance (with a cold engine): | |
- inlet valve | 0.15 mm |
- Exhaust valve | 0.30 mm |
- admission | ±0.04mm |
Valve springs
Two springs per valve are used. The intake and exhaust valves have the same springs.
Spring inner: | |
– diameter | 19.5mm |
– height / under load | 38.4 mm / 85 N |
– height / under load | 29.3 mm / 237 N |
Spring external: | |
– diameter | 29 mm |
– height / under load | 42.4 mm / 180 N |
– height / under load | 33.3 mm / 450 N |
Pushers
Pusher sockets are made directly in the head. The working clearance of the valve is regulated by placing an adjusting plate of the appropriate size on the pusher.
Plate diameter | 13.5mm |
Plate thickness (mm) | 1.650, 1.725, 1.800, 1.900, 1.975, 2.050, 2.125, 2.225 to 3.025 every 0.025, 3.100, 3.175, 3.250, 3.325 to 4.000 every 0.025 |
Cylinder head gasket
Brand | Reinz |
Designation | two types of signs are made on the gaskets, indicating their purpose and thickness (see fig. Head Gasket Identification) |
Designation identifying the engine (A,see fig. Head Gasket Identification): | |
– XUD 9 | without cutout |
– XUD 7TE | 2 cutouts |
Thickness symbol (b, see fig. Head Gasket Identification): | |
– XUD 9 | 2 cutouts 1.61mm |
– XUD 7TE | 2 cutouts 1.65mm |
– XUD 7TE | 3 cutouts 1.80mm |
XUD 9TE engines use a special cylinder head gasket. Identification - 3 cutouts made under the thickness designation cutouts. |
Engine block
The engine block is made of cast iron. The cylinders are made directly in the block. In XUD 7TE engines the coolant circulates between the cylinders, in XUD 9 engines there are special channels between the cylinders.
XUD 9TE engine block height | 303 mm |
Cylinder diameter: | |
– XUD 7TE engine: | |
• 1st size nominal | 80.000 – 80.018 mm (no designation) |
• 2nd size nominal | 80.030 – 80.048 mm (designation A1) |
• 1st repair size | 80.200 - 80, 218 mm (designation R1) |
• 2nd repair size | 80.500 - 80.518 mm (designation R2) |
• 3rd repair size | 80.800 - 80.818 mm (designation R3) |
– XUD 9 engine: | |
• 1st size nominal | 83.000 - 83.018 mm (no designation) |
• 2nd size nominal | 83.030 - 83.048 mm (designation A1) |
• 1st repair size | 83.200 - 83.218 mm (designation R1) |
• 2nd repair size | 83.500 - 83.518 mm (designation R2) |
• 3rd repair size | 83.800 - 83.818 mm (designation R3) |
Crank mechanism
Crankshaft
The crankshaft is made of spheroidal cast iron, supported by five main bearings and has counterweights. The main and connecting rod journals are run-in and induction hardened.
Diameter of main journals: | |
- nominal size | 59.981 – 60.000 mm |
– 1st repair size | 59.681 - 59.700 mm |
Crankpin diameter: | |
- nominal size | 49.984 to 50.000 mm |
– 1st repair size | 49.684 to 49.700 mm |
Neck width #2 of XUD 9 engine: | |
- nominal size | 26.60 to 26.65 mm |
– 1st repair size | 26.80 to 26.85 mm |
– 2nd repair size | 26.90 to 26.95 mm |
– 3rd size repair | 27.00 to 27.05 mm |
Neck width #2 of XUD 7TE engine: | |
- nominal size | 25.70 to 25.75 mm |
– 1st repair size | 25.90 to 25.95 mm |
– 2nd repair size | 26.00 to 26.05 mm |
– 3rd size repair | 27.00 to 27.05 mm |
Thickness of thrust half rings of XUD 9 engines: | |
- nominal size | 2.305±0.025mm |
– 1st repair size | 2.405±0.025 mm |
– 2nd repair size | 2.455±0.025 mm |
– 3rd size repair | 2.505±0.025mm |
Thrust half rings thickness for XUD 7TE engines: | |
- nominal size | 1.855±0.025mm |
– 1st repair size | 1.955±0.025mm |
– 2nd repair size | 2.005±0.025mm |
– 3rd size repair | 2.055±0.025 mm |
Sealing ring on the side of the camshaft drive | 42 x 62 x 8mm |
O-ring, flywheel side | 90 x 110 x 10 mm |
Axial clearance of the crankshaft | 0.07 to 0.32 mm |
Thrust half rings are placed on the main bearing No. 2. | |
Main bearing shells: | |
– nominal thickness | 1.842±0.003 mm |
- repair size | 1.992±0.003 mm |
Flywheel
The flywheel is fixed with eight bolts.
Number of teeth of the ring gear: 136.
Connecting rods
The connecting rods are forged from steel.
Connecting rod inner diameter (for boring after clamping): | |
– XUD 9 engine | 25.007 to 25.020 mm |
– XUD 7TE engine | 28.007 to 28.020 mm |
The distance between the axes of the connecting rod | 145±0.025mm |
Connecting rod bearings: | |
– nominal thickness | 1.827±0.003 mm |
- repair size | 1.977±0.003 mm |
Pistons
The pistons are made from an alloy of aluminum and silicon. They are connected to the connecting rods with fingers fixed with two spring rings.
Piston diameter: | |
– XUD 7TE engine:* | |
• 1st size nominal | 79.93±0.009 mm (no designation) |
• 2nd size nominal | 79.96±0.009mm (designation A1) |
• 1st repair size | 80.13±0.009 mm (designation R1) |
• 2nd repair size | 80.43±0.009 mm (designation R2) |
• 3rd repair size | 80.73±0.009 mm (designation R3) |
– XUD 9 engine:* | |
• 1st size nominal | 82.93±0.009 mm (no designation) |
• 2nd size nominal | 82.96±0.009mm (designation A1) |
• 1st repair size | 83.13±0.009 mm (designation R1) |
• 2nd repair size | 83.43±0.009 mm (designation R2) |
• 3rd repair size | 83.73±0.009 mm (designation R3) |
* Diameter measured at a distance of 25 mm (for XUD 9 engines) and 2.5 mm (for XUD 7TE engines) from the piston crown perpendicular to the axis of the pin.
Piston pins
The piston pin is fixed in the connecting rod and piston. It is fixed with two spring rings.
Diameter: | |
– XUD 9 engine | 25 mm |
– XUD 7TE engine | 28 mm |
Piston pin clearance | 0.003 mm to 0.014 mm |
Piston rings
Each piston has three piston rings.
Lock gap: | |
- compression ring | 0.20 to 0.40 mm |
- sealing ring | 0.15 to 0.35 mm |
- oil scraper ring | 0.10 to 0.35 mm |
Compression ring thickness on XUD 9TE engines | 3.5mm |
Gas distribution system
The operation of the gas distribution system is controlled by a camshaft located in the head, which rotates in three bearings and is driven by a toothed belt. The valves are actuated by the camshaft through tappets fitted with shims.
Camshaft
The cast iron camshaft is fixed in the head, rotates in three bearings and is driven by a toothed belt.
The camshaft of the XUD 7TE engine has a special bulge between the cams of the 1st cylinder.
Bearing diameter: | |
– bearing No. 1 | 27.5mm (flywheel side) |
– bearing №2 | 28.00 mm |
– bearing No. 3 | 28.5mm |
Some camshafts have bearings with a diameter increased by 0.5 mm. Such camshafts are marked accordingly: a ring is drawn in yellow between the cams of the 1st cylinder. Heads in which the camshaft bearings have a diameter increased by 0.5 mm are indicated by an embossed number 1. | |
Axial clearance | 0.025 to 1.114 mm |
In the part of the camshaft that should be on the drive side, there is an inscription "DIST". |
Theoretical valve timing with zero control valve clearance
Engine XUD 9, XUD 9TE: | |
– lead OZD | 44°30' |
– delay ZZD | 83°30' |
– lead OZW | 89°30' |
– delay ZZW | 46°30' |
XUD 7TE Engine: | |
– lead OZD | 51°30' |
– delay ZZD | 76°30' |
– lead OZW | 89°30' |
– delay ZZW | 46°30' |
OZD, ZZD - opening and closing of the intake valve, respectively.
OZW, ZZW - opening and closing of the exhaust valve, respectively.
Toothed belt
Brand: Uniroyal Powergrip or Pirelli Isoran.
Belt tension is provided by a roller tensioner.
Belt replacement interval: every 75,000 km.
Lubrication system
Pressure lubrication is provided by a gear oil pump driven by a chain from the crankshaft.
The oil-coolant heat exchanger is present in all types of engines. The oil spray nozzles for the piston crowns as well as the turbocharger lubrication circuit are located in the XUD 7TE engine.
Oil pump
Type | gear |
Oil pressure: | |
- at idle | 0.2 MPa |
– at 2000 rpm | 0.34 to 0.37 MPa |
– at 4000 rpm | 0.38 to 0.50 MPa |
Reducing valve opening pressure | 0.40 MPa |
Pressure meter: | |
- turn off the control light | 0.08 MPa |
- control lamp on | 0.058 to 0.044 MPa |
Oil filter
Oil filter with replaceable element has an attached bypass valve (0.1 MPa).
Make 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 |
Oil quantity | 4.5 dm3 + 0.5 dm3 (oil filter) |
Oil change interval with filter | every 10,000 km |
Cooling system
The engine is cooled under pressure (0.1 MPa) a mixture of water and a special antifreeze liquid.
The cooling system consists of: a radiator, a coolant pump, an expansion tank connected to the radiator, two fans equipped with electric motors, a thermostat and a temperature sensor.
The cooling circuit provides fuel heating (in some versions).
Coolant pump
The centrifugal coolant pump is fixed in the housing and driven by a toothed belt.
Radiator
The radiator has a horizontal flow core.
Brand: Chausson.
Thermostat
Brand: Calorstat.
Opening start temperature | 88°C |
Full opening temperature | 100°C |
Fans
Brand: AOR.
Two fans equipped with electric motors are installed in front of the radiator.
Functioning: simultaneous, with two speeds controlled by a two-level temperature sensor.
Turn on and turn off temperature: | |
– 1 speed: | |
• 93/ 88°С | in XUD 7TE and XUD 9 engines up to chassis number 8 274 818 |
• 97/ 92°C | in XUD 9 engines from chassis number 8 274 819 |
– 2nd speed: | |
• 97/ 92°С | in XUD 7TE and XUD 9 engines up to chassis number 8 274 818 |
• 101/ 96°C | in XUD 9 engines from chassis number 8 274 819 |
Temperature sensor
This is the coolant temperature sensor.
Temperature of inclusion of a control bulb: 105°C.
Coolant
Recommended Type | a mixture of water and antifreeze in a ratio of 1:1 (up to -17°С) |
Quantity | 7.8 l |
Intervals for changing the coolant and flushing the cooling circuit | every 2 years |
Supply system
Fuel supply is provided by a high-pressure distribution pump and injectors, and in XUD 7TE engines, an additional turbocharger.
Air filter
View | dry filter |
Brand and type | Permabit FA 1526 or Mann |
Fuel tank
Volume | 70 l |
Fuel | diesel |
Bosch injection system
XUD 7TE Engine: | |
– fuel pump type | EP-VE 4/8F 2150 R 316 |
– nozzle | DNOSD 289 |
- type | KCA 17 S 42 |
– adjustment | 13.0 to 13.5 MPa |
– filter | Purflux |
– initial heating: | |
• glow plugs | Bosch 0250 201 01, Beru 0100 22 133 |
• resistance at 20°C | 0.3 to 0.4 ohm |
• heating time | 8 sec |
– adjustment: | |
• pump installation | Before TDC piston No. 4 for lifting the distributor piston 0±0.03 mm |
• dynamic setting | at 750 to 800 rpm 14° |
• idle speed | 750 to 800 rpm |
• increased idle speed | 950±50 rpm |
XUD 9 engine: | |
– fuel pump type | EP-VE 419F 2300 R |
– nozzle | 2722-2 DNOSD 287+ |
- type | KCA 17 S 42 |
– adjustment | 13.0 to 13.5 MPa |
– filter | Purflux |
– initial heating: | |
• glow plugs | Bosch 0250 201 01, Beru 0100 22 133 |
• resistance at 20°С | 0.3 to 0.4 ohm |
• heating time | 8 sec |
– adjustment: | |
• pump installation | Before TDC piston No. 4 for lifting the distributor piston 0.9±0.03 mm |
• dynamic setting | at 750 to 800 rpm 15°± 1° |
• idle speed | 750 to 800 rpm |
• increased idle speed | 950±50 rpm |
Roto Diesel injection system
XUD 7TE Engine: | |
– fuel pump type | DPCR 8443 B 451 C or 452 C |
– nozzle | RDNOSD 6862C |
- type | LCR 67307 |
– adjustment | 13.0±0.5 MPa |
– filter | Roto Diesel |
- element | CAV |
– initial heating: | |
• glow plugs | Bosch 0250 201 01900, Beru 0100 22 133 |
• resistance at 20°C | 0.3 to 0.4 ohm |
• heating time | 8 sec |
– adjustment: | |
• pump installation | Before TDC, piston No. 4 for the rise of the pump piston measured by a dial indicator fixed in the pump 0.01 mm |
• dynamic setting* | 9° |
• dynamic setting at 750 - 800 rpm | 15° |
• idle speed | 750 - 800 rpm |
• increased idle speed | 950±50 rpm |
XUD 9 engine: | |
– fuel pump type | DPCR 8443 B 380 A or 381 B |
– nozzle | RDNOSD 6751C |
- type | LCR 67307 |
– adjustment | 11.5±0.5 MPa |
– filter | Roto Diesel |
– element | CAV |
– initial heating: | |
• glow plugs | Bosch 0250 201 01900, Beru 0100 22 133 |
• resistance at 20°С | 0.3 to 0.4 ohm |
• heating time | 8 sec |
– adjustment: | |
• pump installation | Before TDC, piston No. 4 for the pump piston lift measured by a dial indicator fixed in the pump 0.01 mm |
• dynamic setting* | 15° |
• dynamic setting at 750 - 800 rpm | 15° |
• idle speed | 750 - 800 rpm |
• increased idle speed | 950±50 rpm |
* Value for a quick check with a special diagnostic tool.
High pressure fuel pump on XUD 9TE engines
Brand and type | Bosch VER 445 |
Installation is static | distributor piston stroke 0.66 mm at TDC position of cylinder No. 4 |
The installation is dynamic (the engine is warm) | 11°± 1°at 800 rpm |
Number of revolutions at idle: | |
– without air conditioning | 750±50 rpm |
- with air conditioning | 800±50 rpm |
Maximum no-load speed | 5100±80 rpm |
The number of revolutions at idle with an increased number of revolutions (engine cold) | 950±50 rpm |
Injector kit for XUD 9TE engines
Brand and type | Bosch KCA 17S42 |
Nozzle nozzles on XUD 9TE engines: | |
- make and type | Bosch DNOSD 299 |
Nozzle opening pressure | 17.5 MPa |
Turbocharger
The turbocharger provides additional air to the engine. It has an air cooler that heats up the air supplied to the engine.
Brand and type | Garrett T2 or KKK K 14 |
Compression pressure: | |
– at 2000 rpm | 70±5 kPa |
– at 4300 rpm | 85±5 kPa |
Turbocharger on XUD 9TE engines | |
Brand and type | Garrett T2 or KKK K14 |
Compression pressure: | |
– at 2000 rpm | 70±5 kPa |
– at 3000 rpm | 100±5 kPa |
Tightening torques
cylinder head (new bolts and washers): | |
– stage 1 | 30 Nm |
– stage 2 | 70 Nm |
– stage 3 | Tighten by 120° |
Camshaft end seal frame plate | 15 Nm |
Attaching the oil pan to the block | 20 Nm |
Camshaft bearing caps | 15 - 17.5 Nm |
Connecting rod caps: | |
- Stage 1 | screwing torque 40 Nm |
– stage 2 | loose nuts |
– Stage 3 | screwing torque 20 Nm |
– stage 4 | turning by 70° |
Fastening of covers of radical bearings to the block of cylinders | 70 Nm |
cylinder head cover | 10 Nm |
Fastening of a nozzle to a head of the block of cylinders | 90 Nm |
Camshaft pulley | 35 to 40 Nm |
High pressure fuel pump pulley | 50 Nm |
crankshaft pulley | 40 Nm +60° |
Pressure pump pulley | 35 Nm |
Toothed belt tensioner | 15 Nm |
Oil heat exchanger | 65 Nm |
Flywheel | 50 Nm |
coolant pump | 15 Nm |
Oil pump | 20 Nm |
Left engine bracket: | |
- side nuts | 17.5 Nm |
- central nut | 35 Nm |
Right engine bracket: | |
- nut near the body | 27.5 Nm |
Engine bottom bracket: | |
- nut near the body | 55 Nm |
- nut near the engine | 35 Nm |
Changes in XUD 7TE, XUD 9 and XUD 9TE engines
Cylinder head gasket
Some engines have a cylinder block marked with the symbol "IN", which is characterized by the protrusion of the pistons above the edge of the cylinders, equal to or greater than 0.84 mm. They must be fitted with a 1.83 mm thick head gasket, which is indicated by four cutouts.
Valve springs
Since December 1988, the valves have been equipped with only one spring, which has replaced the two-spring assembly.
Diameter | 29 mm |
Height under load 320 N | 42.4 mm |
Height under load 550 N | 33.0 mm |
The diameter of the wire | 3.8mm |
Designation color | blue, colors "sea wave" |
Seats and Exhaust Valves
For commonality purposes, the XUD 7T and XUD 9 engines are equipped with the same exhaust valve seats as the XUD 9TE engine.
The application of this modification has led to the fact that the recess of the exhaust valve seat relative to the surface of the connection of the cylinder head has become 2.5 mm instead of the previous 2 mm, and the thickness of the valve plate has also increased accordingly to maintain the same compression ratio.
New type sockets are identified by 9 mm diameter holes (instead of holes with a diameter of 7 mm) in the protrusions located above the glow plugs.
Since January 1992, the XUD 9 engine with a modified cylinder head has been designated XUD 9A/L.
The components of both types of cylinder heads are not interchangeable.
Gas distribution system
Engines were progressively fitted with timing belts made from HSN·materials (Hydrogene Sature Nitrile), which are characterized by increased resistance to oils and elevated temperatures.
These belts are designated HSN.
When replacing the belt, the HSN belt must be installed.
Make and type: Pirelli 136 RPP 254 or Gates HTD 58136x1.
Beginning in January 1990, non-power steering vehicles gradually replaced diaphragm vacuum pumps with rotary vane pumps driven directly by the camshaft. As a result of this modification, the camshaft was changed - its length was increased to provide a low pressure pump drive.
Starting with serial number 70 491 894, a vacuum pump at the end of the camshaft is also installed in vehicles with a power steering system.
In vehicles with air conditioning, the previous solution is retained.
Starting with the 1993 model, the 89°thermostat has been replaced by an 83°thermostat.
Starting with the 1993 model year, the old temperature sensors have been replaced with new ones with the following characteristics:
1st stage: | |
– without air conditioning | 92.5°C |
- with air conditioning | 90°C |
2nd stage: | |
– without air conditioning | 97.5°C |
- with air conditioning | 101°C |
Turbocharger
Starting with engine numbers 1CV33-49714, 1CV35-67544, 1CV47-77513, 1CV48-20272, 1CV87-2457, the oil return pipe mounting on the turbocharger has been changed to improve the tightness of the connection. The oil supply line has also been changed.
Individual parts of both types of attachment are not interchangeable.