| Engine type: | |
| – until December 1986 (Sierra '83) | YTT (Peugeot ХD2Р) |
| - since January 1987 (Sierra '87) | YTR |
| Cylinder diameter | 94 mm |
| Piston stroke | 83 mm |
| Working volume | 2304 cm³ | Compression pressure: | - nominal | 2.5 MPa |
| - minimum | 2.0 MPa |
| – permissible difference between cylinders | 0.5 MPa |
| Nominal power | 49 kW (67 hp) |
| Nominal speed | 4200 rpm |
| Maximum torque | 139 Nm |
| Number of revolutions at maximum torque | 2000 rpm |
Cylinder head
The head is made of light alloy with inserted combustion chambers, valve seats and guides.
| Cylinder head height | 90±0.15 mm |
| Maximum amount of regrinding of the lower plane of the cylinder head | 0.5 mm |
| Maximum non-flatness of the lower plane of the cylinder head: | |
| - transverse | 0.1 mm |
| - diagonally | 0.2 mm |
Combustion chambers
Swirl combustion chambers, steel, inserted into the cylinder head and fixed with a ball.
| Combustion chamber type | vortex Ricardo Comet Mark V |
| Ball diameter | 3 mm |
| Protrusion of swirl chambers from the lower plane of the cylinder head | 0 – 0.03 mm |
Valve seats
The valve seats are pressed into the cylinder head.
| Valve seat working chamfer angle: | - intake | 120° |
| - graduation | 90° |
| Working chamfer width | 2.2 – 2.5 mm |
| Outer diameter of inlet valve seats: | |
| - nominal | 42.275 – 43.325 mm |
| - repair | 42.475 – 42.525 mm |
| Outer diameter of exhaust valve seats: | |
| - nominal | 36.275 – 36.525 mm |
| - repair | 36.475 – 36.525 mm |
Valve guides
The valve guides are pressed into the cylinder head and are the same for both intake and exhaust valves.
| O.D: | |
| - nominal | 14,048 –14,059 mm |
| - first repair | 14,280 – 14,290 mm |
| - second repair | 14,579 –14,590 mm |
| Inner diameter | 8.520 – 8.542 mm |
| Length | 55 mm |
| Distance between the guide and the lower plane of the cylinder head | 27.95 – 28.05 mm |
Valves
The valves are installed in the cylinder head vertically and parallel to each other (at right angles to the lower plane of the cylinder head).
| Plate diameter: | |
| - inlet valve | 40.5 mm |
| - exhaust valve | 33.5 mm |
| Rod diameter: | - inlet valve | 8.473 – 8.495 mm |
| - exhaust valve | 8.453 – 8.475 mm |
| Maximum valve guide clearance | 0.15 mm |
| Working chamfer angle: | |
| - inlet valve | 120° |
| - exhaust valve | 90° |
| Full valve length | 116.25 mm |
| Valve recess relative to the lower plane of the cylinder head: | 0.75–1.15 mm. |
| Valve clearance (cold engine) | |
| Intake valve clearance | 0.30 mm |
| Exhaust valve clearance | 0.35 mm |
Valve springs
Two springs are used for each valve, the same for both intake and exhaust valves.
| Free length: | |
| - internal spring | 41.00 mm |
| - outer spring | 44.6 mm |
| Length under load 155 N (15.8 kg): | |
| - internal spring | 22±0.5 mm |
| - outer spring | 26±0.5 mm |
| Spring wire diameter: | |
| - internal spring | 2.3 mm |
| - outer spring | 3.8 mm |
| Inner diameter: | |
| - internal spring | 15.0 0 + 0.40 mm |
| - outer spring | 23.2 0 + 0.40 mm |
| Installation method: the end of the spring with compressed coils should be on the cylinder head side | |
Cylinder head gasket
The cylinder head gaskets were made of synthetic material and initially had (engines with a number below SH 79876) two thicknesses, and then (engines with a number above SH 79876) three thicknesses. The thickness of the gasket is selected depending on the protrusion of the pistons above the upper plane of the engine cylinder block. The thickness of the gasket is identified by the number of cuts on its edge.
Piston protrusion (engines with number below SH 79876): | |
– less than 0.84 mm | 1.58mm thick gasket (designation: 2 notches) |
– more than 0.84 mm | 1.70mm thick gasket (designation: 3 notches) |
Piston protrusion (engines with number higher than SH 79876): | |
– from 0.69 to 0.79 mm | 1.53mm thick spacer (designation: 2 notches) |
– from 0.79 to 0.89 mm | 1.63mm thick gasket (designation: 3 notches) |
– more than 0.89 mm | 1.73mm thick gasket (designation: 4 notches) |
Only new type gaskets (three thicknesses) are manufactured as spare parts | |
Cylinder block
The cast iron cylinder block has cylinders made directly in its material. It has five crankshaft main bearing seats and three camshaft bearing seats.
| Cylinder diameter: | |
| – nominal: | |
| group A | 94,000 – 94,015 mm |
| group B | 94.015 – 94.030 mm |
| – 1st repair size: | |
| group C | 94.200 – 94.215 mm; |
| group D | 94.215 – 94.230 mm |
| – 2nd repair size: | |
| group E | 94.400 – 94.415 mm |
| group F | 94.415 – 94.430 mm |
| – 3rd repair size: | |
| group G | 94.600 – 94.615 mm |
| group H | 94.615 – 94.630 mm |
| Valve tappet guide seat hole diameters: | |
| – nominal size | 24.00 – 24.03 mm |
| - repair size | 24.20 – 24.23 mm |
Crank mechanism
Crankshaft
| The crankshaft is forged from steel together with four counterweights and rests on five main bearings. | |
| Axial play | 0.08 – 0.29 mm |
| Main journal diameters: | |
| – 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 main journals: | |
| - front | 38.40 – 38.55 mm |
| - intermediate | 30.40 – 30.60 mm |
| - average | 37.76 – 37.81 mm |
| - back | 37.84 – 38.04 mm |
| Main bearing journal clearance | 0.040 – 0.098 mm |
| Connecting rod journal diameters: | |
| – nominal size | 54.984 – 55.011 mm |
| - repair size | 54.684 – 54.711 mm |
| Length of crank journals | 36.00 – 36.10 mm |
| Thickness of thrust half rings: | |
| – nominal size | 2.30 – 2.33 mm |
| - repair size | 2.50 – 2.53 mm |
Main bearings
| These are thin-walled liners with a shell made of sheet steel and antifriction material made of zinc-aluminum alloy. | |
| Width of inserts: | |
| - front, middle and rear | 29.80 mm |
| - intermediate | 21.80 mm |
Connecting rods
| The connecting rods are forged from steel and have an I-beam cross-section and a straight base parting line. | |
| Distance between the axes of the head and base holes | 150 mm |
| Connecting rod head bushing inner diameter (after installation) | 28.0+0.02 – 28.0+0.07 mm |
| Clearance of connecting rod journal in connecting rod bearing | 0.040 – 0.098 mm |
Connecting rod bearings
| These are thin-walled liners with a shell made of sheet steel and antifriction material made of zinc-aluminum alloy. | |
| Thickness of liners: | |
| - nominal | 1.819±0.003 mm |
| - repair | 1.969±0.003 mm |
| Width of inserts | 29.0 mm |
Pistons
| The pistons are made of aluminum-silicon alloy. | |
| The maximum difference in mass of a set of engine pistons must not exceed 5 g | |
| Cylinder installation method | The recesses on the bottom of the piston (for the valve plates and combustion chamber) should be on the fuel pump side |
| Piston diameter (measured below the piston pin bore and parallel to the axis of this bore) | |
| – nominal: | |
| group A | 93.855 – 93.870 mm |
| group B | 93.870 – 93.885 mm |
| –1st repair size: | |
| group C | 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 H | 94.470 – 94.485 mm |
| Piston protrusion at TDC above the upper plane of the cylinder block | 0.54 – 0.89 mm |
| Piston clearance in cylinder | 0.130 – 0.160 mm |
Piston pins
| The pin is made of steel and surface hardened. | |
| The pin rotates in the piston and connecting rod head bushing (the so-called floating pin) and is fixed from longitudinal movement by two spring retaining rings | |
| Outer diameter | 27,994 – 28,000 mm |
Piston rings
| Each piston has three rings: | |
| - upper | Sealing with chrome-plated, convex outer working surface |
| - average | Sealing with conical outer working surface |
| - lower | Oil scraper type U-Flex |
| Installation method: applies to the middle and lower rings, inscription "Thor" (top) is directed towards the bottom of the piston. | |
| Width of the ring lock installed in the cylinder: | |
| - top ring | 0.40 – 0.65 mm |
| - middle ring | 0.35 – 0.60 mm |
| - lower ring | 0.15 – 0.30 mm |
| Ring thickness: | |
| - upper | 1,978 – 1,990 mm |
| - average | 1,978 – 1,990 mm |
| - lower | 4.478 – 4.490 mm |
| Clearance of rings in piston grooves | 0.032 – 0.090 mm |
Gas distribution system
The gas distribution system contains:
- camshaft mounted in the cylinder block;
- pushers;
- push rods;
- valve levers and valves.
The camshaft is driven by a double-row chain from the crankshaft.
Distribution phases
| The distribution phases are determined at zero valve clearance for the lift of the exhaust and intake valves equal to 0.60 mm. | |
| OZD | 12° before TDC |
| ZZD | 40° after BDC |
| OZW | 56° before BDC |
| ZZW | 12° after TDC |
| OZD and ZZD | Accordingly, the opening and closing of the intake valve |
| OZW and ZZW | Accordingly, the opening and closing of the exhaust valve |
| Valve clearance (cold): | |
| – intake valve clearance | 0.30 mm |
| – clearance of exhaust valves | 0.35 mm |
Camshaft
The cast iron camshaft has cams with improved thermal characteristics and is mounted in the cylinder block on three bearings.
| Neck diameters | 41.925 – 41.950 mm |
| Radial clearance | 0.05 – 0.11 mm |
| Axial play | 0.05 – 0.15 mm |
| Cam lift (at zero valve clearance): | |
| – inlet: | 9.12 mm |
| - graduation: | 9.12 mm |