DOHC Engine Specifications (Scorpio 1)

The engine is a petrol, four-stroke, four-cylinder, in-line, water-cooled engine with two camshafts in the cylinder head and is mounted longitudinally in front of the vehicle.

Main parameters

Engine	2.0 DОНС	2.0 DОНС	2.0 DОНС	2.0 DОНС
Engine type	N8B	N8D	N9B	N9D
Cylinder diameter (mm)	86,00	86,00	86,00	86,00
Piston stroke, (mm)	86,00	86,00	86,00	86,00
Volume (cm³)	1998	1998	1998	1998
Compression ratio	10,3	10,3	10,3	10,3
Compression pressure, (MPa)	1,1 – 1,3	1,1 – 1,3	1,1 – 1,3	1,1 – 1,3
Nominal power:
– kW at rpm	77 at 5600	80 at 5600	92 at 5500	88 at 5500
– HP at rpm	105 at 5600	109 at 5600	125 at 5500	120 at 5500
Maximum torque, (Nm at rpm)	168 at 3000	174 at 3000	168 at 3000	171 at 2500

Cylinder head

The head is made of a special aluminum alloy and has steel insert valve seats.

Regrinding of the lower surface of the cylinder head is not provided.

Designation	20
Diameters of the holes of the camshaft bearing seats	26,000 – 26,030 mm

Cylinder head gasket

Brand: Reinz.

Valve guides

The valve guides are made of cast iron and are pressed into the cylinder head at an angle of 20°.

Nominal diameter: 7.063–7.094 mm.

Valves

The valves are installed in the cylinder head and are inclined at an angle of 20° to the cylinder axis and are actuated by the camshaft cams via hydraulic tappets. The valve clearance is adjusted automatically.

Valve sizes

Inlet valve:
– valve length	108.24 – 108.70 mm
– plate diameter	42.50 – 42.70 mm
– rod diameter:
nominal	7.025 – 7.043 mm
repair size +0.2	7.225 – 7.243 mm
repair size +0.4	7.425 – 7.443 mm
repair size +0.6	7.625 – 7.643 mm
repair size +0.8	7.825 – 7.843 mm
– clearance of the rod in the guide	0.020 – 0.069 mm
– working chamfer angle	90°
Exhaust valve:
Valve length	108.71 – 109.17 mm
– plate diameter	37.90 – 38.10 mm
– rod diameter
nominal	6.999 – 7.017 mm
repair size +0.2	7.199 – 7.217mm
repair size +0.4	7.399 – 7.417 mm
repair size +0.6	7.599 – 7.617 mm
repair size +0.8	7.799 – 7.817 mm
– clearance of the rod in the guide	0.046 – 0.095 mm
– working chamfer angle	90°

Valve springs

Two springs are used per valve.

Intake valve springs:
– spring diameter	24.00 mm
– spring wire diameter	4.5 mm
– number of turns	6,1
- free length	46.80 mm
Exhaust valve springs:
– spring diameter	17.5 mm
– spring wire diameter	2.5 mm
– number of turns	8,0
- free length	48.20 mm

Engine cylinder block

The engine cylinder block is cast from cast iron. The cylinders are made directly in the cylinder block.

Designation	20
Bearing support width	27.17 – 27.22 mm
Inner diameters of main bearings (measured vertically):
- nominal	55.001 – 55.038 mm
– repair size -0.05	54.951 – 54.988 mm
– repair size -0.25	54.751 – 54.788 mm
– repair size -0.50	54.501 – 54.538 mm
– repair size -0.75	54.251 – 54.288 mm
Diameters of the holes of the main bearing seats in the cylinder block:
– nominal size	59.287 – 59.300 mm
– repair size +0.4	59,687 – 59,700 mm
Cylinder diameters:
– nominal standard diameters:
group 1	86,000 – 86,100 mm
group 2	86.100 – 86.200 mm
– 1 repair size +0.15:
group A	86.150 – 86.160 mm
group B	86.160 – 86.170 mm
– 2 repair size +0.50	86,500 – 86,510 mm

Crank mechanism

Crankshaft

The steel crankshaft is supported by five bearings.

Axial play	0.09 – 0.30 mm
Main journal diameters:
– nominal size (yellow mark)	54,980 – 54,990 mm
– nominal size (red mark)	54,990 – 55,000 mm
– repair size -0.25 (green mark)	54,730 – 54,750 mm
Main bearing clearance	0.011 – 0.048 mm
Measurements are taken using Plastigage measuring rods.
Connecting rod journal diameters:
– nominal size	50, 890 – 50,910 mm
– repair size -0.25 (green mark)	50.640 – 50.660 mm
Thickness of thrust half rings:
– nominal size	2.301 – 2.351 mm
- repair size	2.491 – 2.541 mm

Flywheel

The flywheel is secured to the crankshaft flange with six bolts located at different distances from each other.

Connecting rods

The connecting rods are forged from steel and have an I-beam profile in cross-section. In the lower part of the connecting rod there is an oil sprayer for lubrication and cooling of the pistons. The piston pin is pressed into the connecting rod head.

Connecting rod head bore diameter	20.589 – 20.609 mm
Connecting rod pin tension	0.018 – 0.039 mm
Connecting rod head heating temperature during pin installation	250 – 300°C
Connecting rod base bore diameter	53.890 – 53.910 mm
Inner diameters of connecting rod bearing holes:
– nominal size	55.001 – 55.038 mm
– repair size -0.05	54.951 – 54.988 mm
– repair size -0.25	54.751 – 54.788 mm
– repair size -0.50	54.501 – 54.538 mm
– repair size -0.75	54.251 – 54.288 mm
Clearance in connecting rod bearings	0.006 – 0.060 mm
Measurements are taken using Plastigage measuring rods.
Permissible non-perpendicularity of the hole axis relative to the connecting rod axis:
- head hole	0.10 mm
- base hole	0.15 mm

Pistons

The pistons are made of light alloy, without grooves on the conductive part, with a cast invar ring, limiting thermal changes in size. In the upper part there are three grooves for piston rings. The axis of the piston pin hole is offset relative to the piston axis. Pistons are supplied in sets together with pins and connecting rods.

Installation method: The arrow on the bottom of the piston should point towards the front of the engine (towards the timing drive).

Piston sizes

Engine	2.0 dm³
Nominal standard diameters:
- group 1	85.970 – 85.980 mm
- group 2	85,980 – 85,990 mm
Repair size diameters:
- standard	85,980 – 86,000 mm
– with a tolerance of 0.15	86.130 – 86.150 mm
– with a tolerance of 0.50	86.470 – 86.490 mm
Clearance of new pistons in cylinders	0.020 – 0.040 mm

Piston pins

The pins are made of steel and heat-treated, pressed into the connecting rod heads (hot mounting at a head temperature of 250–300°C) and rotate in the piston hubs.

Length	63.40 mm
Diameter:
- marked in white	20.622 – 20.625 mm
- marked in red	20.625 – 20.628 mm
- marked in blue	20.628 – 20.631 mm
- marked in yellow	20.631 – 20.634 mm
Piston hub clearance	0.008 – 0.014 mm
Connecting rod head tension	0.018 – 0.039 mm

Piston rings

Each piston has three rings: two sealing rings (the upper one is square in section, the middle one is conical in section) and one oil scraper ring.

Clearance of the sealing ring lock (installed in the cylinder):
- upper	0.30 – 0.60 mm
- average	0.50 – 0.80 mm
Oil scraper ring lock clearance	0.40 – 1.50 mm
Location of ring locks:
- sealing	150° (in opposite directions) relative to the oil scraper ring lock
- oil scraper	the expansion spring lock is installed in accordance with the direction of the arrow on the bottom of the piston the locks of the upper and lower plates are installed 25 mm to the right and left of the direction of the arrow

Gas distribution system

The camshafts are located in the cylinder head, drive the valves directly through tappets and are driven by a single-row chain.

Distribution phases

Engine	N8B	N9B
OZD	13° before TDC	13° before TDC
ZZD	39° after BDC	51° after BDC
OZW	43° before BDC	43° before BDC
ZZW	13° after TDC	13° after TDC

OZD and ZZD – opening and closing of the intake valve, respectively.
OZW and ZZW – opening and closing of the exhaust valve, respectively.
TDC and BDC are top and bottom dead centers, respectively.

Drive chain

Drive chain - single row, roller, 3/8 inch.

The chain is tensioned by a hydraulic tensioner.

Camshafts

The camshafts rotate in five bearings.

Camshaft Bearing Diameters	25,960 – 25,980 mm
Axial play of the camshaft	0.020 – 0.260 mm
Cam lift:
- intake, N8B engine	10.5 mm
- intake, engine N9B	11.1 mm
- graduation	10.9 mm

Lubrication system

Lubrication under pressure is provided by a gear oil pump with a chain drive from the crankshaft, in the body of which there is a bypass valve.

Minimum oil pressure (at 80°C):
– at 750 rpm	0.16 MPa
- at 2000 rpm	0.37 – 0.46 MPa
Bypass valve opening pressure (at 1000 rpm)	0.37 – 0.46 MPa
Oil pressure warning light illumination pressure	0.03 – 0.06 MPa

A warning light on the instrument cluster indicates a decrease in the engine oil level.

Engine oil volume in the engine, dm³:
- with filter replacement	4,50
– without filter replacement	4,00

Oil pump

The internal gear oil pump is driven by a chain from the crankshaft and is located at the front of the engine.

Clearance of gear with internal teeth relative to housing	0.150 – 0.301 mm
Gap between gear teeth	0.05 – 0.20 mm
Axial clearance of gears	0.039 – 0.104 mm

Oil filter

Full-flow oil filter with replaceable filter element.

Brand: Motorcraft.

Cooling system

The closed cooling circuit with antifreeze liquid contains a radiator, expansion tank, coolant pump, thermostat and fan.

Radiator and expansion tank

The cross flow radiator has tanks made of artificial material.

The expansion tank is made of transparent material and has markings indicating the maximum and minimum coolant levels.

Opening pressure of the excess pressure valve in the expansion tank cap: 120 – 140 kPa.

Coolant pump

The centrifugal coolant pump, located on the front wall of the cylinder block, is driven by a V-belt together with the generator.

Fan

A fan with an electric drive from a temperature sensor located in the radiator drain plug.

Thermostat

Temperature at the beginning of opening: 85–89°C.

Full opening temperature: 102 ±3°C.

Coolant

Quantity:
– N8B engine	7.9 dm³
– N9B engine	7.3 dm³
Type	a mixture of special antifreeze liquid Ford SSM 97 B 9103 A and distilled water (50% each) provides protection up to -30°C
Replacement frequency	every 60,000 km of vehicle mileage or once every two years

Tightening moments

Main bearing cap bolts	88 – 102 Nm
Camshaft Bearing Cap Bolts	22 – 26 Nm
Connecting rod bolts:
- Stage 1	6 – 8 Nm
- 2nd stage	15 – 17 Nm
- Stage 3	turn 90°
Torsional vibration damper:
- Stage 1	45 – 58 Nm
- 2nd stage	turn 90°
Crankshaft pulley bolt	110 – 130 Nm
Camshaft Sprocket Bolt	55 – 63 Nm
Flywheel bolts	82 – 90 Nm
Oil pump mounting bolts	8.5 – 11.5 Nm
Oil pan bolts	8 – 11 Nm
Oil drain plug in the oil pan	21 – 28 Nm
Oil pump chain tensioner mounting bolt	10 – 13 Nm
Oil pressure sensor	18 – 22 Nm
Water pump mounting bolt	21 – 28 Nm
Water pump pulley mounting bolt	21 – 28 Nm
Cylinder head bolts:
- Stage 1	20 – 25 Nm
- 2nd stage	50 – 55 Nm
- Stage 3	turn 90°
- Stage 4	turn 90°
– 5th stage (bolt M8)	24 – 27 Nm
Timing system housing	6.5 – 9.5 Nm
Upper chain guide mounting bolt	10 – 13 Nm
Lower chain guide mounting bolt	24 – 28 Nm
Intake manifold	20 – 24 Nm
Exhaust manifold	21 – 25 Nm
Spark plugs	20 – 28 Nm
Thermostat housing	9 – 12 Nm
Cylinder head cover bolts	5 – 7 Nm
Fan switch temperature sensor	27 – 32 Nm
Coolant temperature sensor	15 – 20 Nm