Technical characteristics of OHC engines (Scorpio 1)

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

Main parameters

Engine	1.8 ONS	2.0 ONS	2.0 ONS	2.0 ONS	2.0 ONS
Engine type	REC	NEL	NER	NRC	NRA
Cylinder diameter (mm)	86,20	90,82	90,82	90,82	90,82
Piston stroke (mm)	76,95	76,95	76,95	76,95	76,95
Volume (cm³)	1798	1993	1993	1993	1993
Compression ratio	9,5	9,2	9,2	9,2	9,2
Compression pressure (MPa)	1,1 – 1,3	1,1 – 1,3	1,1 – 1,3	1,1 – 1,3	1,1 – 1,3
Nominal power:
– kW at rpm	66 at 5400	77 at 5200	74 at 5400	74 at 5100	85 at 5500
– HP at rpm	90 at 5400	105 at 5200	100 at 5400	100 at 5100	115 at 5500
Maximum torque (Nm at rpm)	140 at 3500	157 at 4000	153 at 4000	148 at 4000	160 at 4000

Cylinder head

The head is made of a special aluminum alloy and has inlet valve seats made directly in the cylinder head material, and the exhaust valve seats are pressed in.

Designation:
– 1.8 dm³ engine	85
– 2.0 dm³ engine	0

Valve seats

Angle of the working chamfer of the valves	90°
Upper cone angle:
- intake	70°
- graduation	40°
Width of the working chamfer of the valve seat	1.5 – 2.0 mm

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

Diameters of the holes of the camshaft bearing seats

Front bearing	45.072 – 45.102 mm
Middle bearing	47.692 – 47.772 mm
Rear bearing	48.072 – 48.102 mm

Cylinder head gasket

Brand: Reinz.

Valve guides

The guide holes are made directly in the cylinder head at an angle of 7°30'.

Nominal diameter	8.063 – 8.088 mm
Repair size:
- excess of 0.2	8.263 – 8.288 mm
- excess of 0.4	8.463 – 8.488 mm
- excess of 0.6	8.663 – 8.688 mm
- excess of 0.8	8.863 – 8.888 mm

Valves

The valves are installed in the cylinder head and are inclined at an angle of 7°30' to the cylinder axis.

	Inlet valve	Exhaust valve
Valve length:
– REC engine	111,75 – 112,75	111,15 – 112,15
– NEL, NER engine	110,65 – 111,65	110,05 – 111,05
- NRA, NRC engine	110,65 – 111,65	110,75 – 111,75
Plate diameter:
– REC engine	41,80 – 42,20	34,00 – 34,40
– NEL, NER, NRA, NRC engine	41,80 – 42,20	35,80 – 36,20
Valve stroke	10,10	10,10
Intake valve dimensions common to all engines:
– rod diameter:
nominal	8.025 – 8.043 mm
repair size +0.2	8.225 – 8.243 mm
repair size +0.4	8.425 – 8.443 mm
repair size +0.6	8.625 – 8.643 mm
repair size +0.8	8.825 – 8.843 mm
– clearance of the rod in the guide	0.020 – 0.063 mm
Exhaust valve dimensions common to all engines:
– rod diameter:
nominal	7.999 – 8.017 mm
repair size +0.2	8.199 – 8.217 mm
repair size +0.4	8.399 – 8.417 mm
repair size +0.6	8.599 – 8.617 mm
repair size +0.8	8.799 – 8.817 mm
– clearance of the rod in the guide	0.046 – 0.089 mm
Valve clearance (cold engine):
- inlet valve	0.20 mm
- exhaust valve	0.25 mm

Valve springs

The same springs are used for the intake and exhaust valves.

Spring diameter	23.445 – 23.95 mm
Spring wire diameter	3.87 – 3.93 mm
Number of turns	4,7
Free length	47.00 mm

Engine cylinder block

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

Bearing support width	27.17 – 27.22 mm
Inner diameters of main bearings (measured vertically):
– nominal:	57,000 – 57,034 mm
– repair size -0.25	56.750 – 56.784 mm
– repair size -0.50	56,500 – 56,534 mm
– repair size -0.75	56.250 – 56.284 mm
– repair size -1.00	56,000 – 56,034 mm
Diameters of the holes of the main bearing seats in the cylinder block:
– nominal size	60.620 – 60.640 mm
– repair size +0.4	61,020 – 61,040 mm

Cylinder diameters (mm)

Engine	1.8 dm³	2.0 dm³
Designation	REC	NEL, NER, NRA, NRC
Nominal standard diameters:
- group 1	86,180 – 86,190	90,800 – 90,810
- group 2	86,190 – 86,200	90,810 – 90,820
- group 3	86,200 – 86,210	90,820 – 90,830
- group 4	86,210 – 86,220	90,830 – 90,840
Nominal diameters with tolerance:
- Group A	86,690 – 86,700	91,310 – 91,320
- Group B	86,700 – 86,710	91,320 – 91,330
- Group C	86,710 – 86,720	91,330 – 91,340
Repair size diameters:
- standard	86,210 – 86,220	90,830 – 90,840
– with a tolerance of 0.5	86,710 – 86,720	91,330 – 91,340
– with a tolerance of 1.0	87,210 – 87,220	91,830 – 91,840

Crank mechanism

Crankshaft

The steel crankshaft is supported by five bearings.

Axial clearance:	0.08 - 0.28 mm
Main journal diameters:
– nominal size	56,970 – 56,990 mm
– repair size -0.25	56,720 – 56,740 mm
– repair size -0.50	56,470 – 56,490 mm
– repair size -0.75	56.220 – 56.240 mm
– repair size -1.00	55.970 – 55.990 mm
Main bearing clearance	0.010 – 0.064 mm
Warning! Measurements are taken using Plastigage measuring rods.
Connecting rod journal diameters:
– nominal size	51,980 – 52,000 mm
– repair size -0.25	51,730 – 51,750 mm
– repair size -0.50	51,480 – 51,500 mm
– repair size -0.75	51.230 – 51.250 mm
– repair size -1.00	50,980 – 50,000 mm
Thickness of thrust half rings:
– nominal size	2.30 – 2.35 mm
- repair size	2.50 – 2.55 mm

Flywheel

The flywheel is secured to the crankshaft flange with six bolts.

Intermediate shaft

The intermediate shaft is located in the front part of the cylinder block, on the left side. Provides drive for the ignition distributor, as well as the oil and fuel pumps.

Axial clearance: 0.050–0.204 mm.

Connecting rods

The connecting rods are forged from steel and have an I-beam profile in their cross-section. The piston pin is pressed into the connecting rod head.

Connecting rod head bore diameter	23.964 – 23.976 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	55,000 – 55,020 mm
Inner diameters of connecting rod bearing holes:
– nominal size	52.006 – 52.044 mm
– repair size -0.25	51.756 – 51.794 mm
– repair size -0.50	51.706 – 51.744 mm
– repair size -0.75	51.256 – 56.294 mm
– repair size -1.00	51.006 – 51.044 mm
Clearance in connecting rod bearings	0.006 – 0.064 mm
Warning! 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).

	Engine 1.8 dm³	Engine 2.0 dm³
Nominal standard diameters:
- group 1	86,145 – 86,155	90,765 – 90,775
- group 2	86,155 – 86,165	90,775 – 90,785
- group 3	86,165 – 86,175	90,785 – 90,795
- group 4	86,175 – 86,185	90,795 – 90,805
Repair size diameters:
- standard	86,170 – 86,195	90,790 – 90,815
– with a tolerance of 0.5	86,670 – 86,695	91,290 – 91,315
– with a tolerance of 1.0	87,170 – 87,195	91,790 – 91,815
Clearance of new pistons in cylinders	0,015 – 0,050	0,015 – 0,050

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:
– 1.8 dm³ engine	68.0 – 68.8 mm
– 2.0 dm³ engine	72.0 – 72.8 mm
Diameter (mm):
- marked in red	23,994 – 23,997
- marked in blue	23,997 – 24,000
- marked in yellow	24,000 – 24,003
Piston hub clearance	0.008 – 0.014 mm
Preload in the connecting rod head	0.018 – 0.039 mm

Piston rings

Each piston has three rings: two sealing rings and one oil scraper ring.

Clearance of the sealing ring lock (installed in the cylinder):
– 1.8 dm³ engines	0.30 – 0.50 mm
– 2.0 dm³ engine	0.38 – 0.48 mm
Oil scraper ring lock clearance	0.40 – 1.40 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 camshaft is located in the cylinder head, drives the valves via the valve lever and is driven by a toothed belt.

Valve clearance (cold):
- inlet	0.20 mm
- graduation	0.25 mm

Distribution phases

OZD	24° before TDC
ZZD	64° after BDC
OZW	70° before BDC
ZZW	18° after TDC

ZD 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.

Toothed belt

Brand	Ford Powergrip
Type:
– 1.8 dm³ engines	70NM 6288 AA
– 2.0 dm³ engine	70NM 6268 AA
Number of teeth:
– 1.8 dm³ engines	119
– 2.0 dm³ engine	122

Camshaft

The camshaft rotates in three bearings.

Camshaft bearing diameters:
- front	41.987 – 42.013 mm
- average	44.607 – 44.633 mm
- rear	44.987 – 45.013 mm
Inner diameters of bearing bushings:
- front	42.035 – 42.055 mm
- average	44.655 – 44.675 mm
- rear	45.035 – 45.055 mm
Camshaft axial play	0.104 – 0.204 mm
Thickness of camshaft thrust washers	3.96 – 4.01 mm
Cam lift:
– 1.8 dm³ engine	5.9639 mm
– 2.0 dm³ engine	6.3323 mm
Height of cams:
– 1.8 dm³ engine	35.894 – 36.234 mm
– 2.0 dm³ engine	36,260 – 36,600 mm

Lubrication system

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

Minimum oil pressure (at 80°C):
– at 750 rpm	0.1 MPa
- at 2000 rpm	0.5 MPa
Bypass valve opening pressure (at 1000 rpm)	0.40 – 0.47 MPa
Oil pressure warning light illumination pressure	0.03 MPa – 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	3,75
– without filter replacement	3,25

Oil pump

The Hobourn-Eaton type internal gear oil pump is driven from the intermediate shaft.

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	0.028 – 0.104 mm

Oil filter

The full-flow oil filter is located on the left side of the cylinder block.

Make and type: Motorcraft EFL 90.

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 for the maximum and minimum coolant levels. In cars equipped with an automatic transmission, the right radiator tank contains the automatic transmission oil cooler (type oil coolant).

Opening pressure of the excess pressure valve in the expansion tank cap: 85–110 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.

V-belt

Brand and type	Motorcraft 83 HF 6 C 301 AA
Tension (measured with Ford special fixture):
- new belt	400 – 500 N
- used belt	300 – 400 N
Sag	10mm in the middle of the longer section under thumb pressure

Fan

Made of synthetic material, it has seven blades, is located on the coolant pump shaft and is driven by a V-belt together with the pump and generator.

Thermostat

Wax, located on the pipeline that drains coolant from the engine cylinder head.

Opening start temperature	85° – 89°C
Nominal opening temperature	88°C

Coolant

Quantity	8 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
Connecting rod bolts	26 – 33 Nm
Crankshaft pulley bolt	110 – 130 Nm
Camshaft pulley bolt	45 – 50 Nm
Flywheel bolts	67 – 70 Nm
Oil pump mounting bolts	14 – 17 Nm
Oil pump cover bolts	9 – 13 Nm
Oil pan bolts:
- Stage 1	1 – 2 Nm
- 2nd stage	6 – 8 Nm
– Stage 3 (after 20 minutes of engine operation)	8 – 10 Nm
Oil drain plug in the oil pan	21 – 28 Nm
Oil pressure sensor	12 – 15 Nm
Valve clearance adjustment bolts near the valve levers	50 – 55 Nm
Cylinder head bolts:
- Stage 1	35 – 40 Nm
- 2nd stage	70 – 75 Nm
– Stage 3 (after 10 – 20 minutes)	turn 90°
– Stage 4 (after 15 minutes of engine operation at 1000 rpm, with a hot engine)	95 – 115 Nm
Timing system housing	13 – 17 Nm
Intake manifold	17 – 21 Nm
Exhaust manifold	21 – 25 Nm
Spark plugs	20 – 28 Nm
Thermostat housing	17 – 21 Nm
Cylinder Head Cover Bolts:
– bolts 1 – 6	5 – 7 Nm
– bolts 9 and 10	2 – 2.5 Nm
– bolts 7 and 8	5 – 7 Nm
– bolts 9 and 10	5 – 7 Nm

[The full article is on the online resource Fordbook.ru]