| Engine's type: | |
| – until December 1986 (Sierra '83) | YTT (Peugeot XD2P) |
| – 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 |
| - allowable difference between cylinders | 0.5 MPa |
| Rated power | 49 kW (67 HP) |
| Rated speed | 4200 rpm |
| Max Torque | 139 Nm |
| Number of revolutions at maximum torque | 2000 rpm |
Cylinder head
The head is made of light alloy with inserted combustion chambers, seats and valve guides.
| Cylinder head height | 90±0.15mm |
| Maximum amount of grinding of the lower plane of the cylinder head | 0.5 mm |
| Maximum flatness of the lower plane of the cylinder head: | |
| - transverse | 0.1 mm |
| - diagonally | 0.2mm |
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 bottom plane of the cylinder head | 0 - 0.03 mm |
Valve seats
The valve seats are pressed into the cylinder head.
| Valve seat angle: | - inlet | 120° |
| - graduation | 90° |
| 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 |
| Exhaust valve seat outer diameter: | |
| - 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.
| Outside diameter: | |
| - nominal | 14.048 -14.059 mm |
| - the 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 bottom plane of the cylinder head).
| Plate diameter: | |
| - inlet valve | 40.5 mm |
| - exhaust valve | 33.5mm |
| Rod diameter: | - inlet valve | 8.473 - 8.495 mm |
| - exhaust valve | 8.453 - 8.475 mm |
| Maximum Valve Guide Clearance | 0.15 mm |
| Chamfer Angle: | |
| - inlet valve | 120° |
| - exhaust valve | 90° |
| Full valve length | 116.25 mm |
| The depth of the valves relative to the lower plane of the cylinder head: | 0.75 -1.15 mm. |
| Valve clearance (with a 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 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±0.5mm |
| - outer spring | 26±0.5mm |
| Spring wire diameter: | |
| - internal spring | 2.3 mm |
| - outer spring | 3.8mm |
| 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, must be on the side of the cylinder head | |
Cylinder head gasket
The cylinder head gaskets were made of synthetic material and had originally (motors below SN 79876) two thicknesses and then (engines above SN 79876) three thicknesses. The thickness of the gasket is selected depending on the protrusion of the pistons above the upper plane of the engine block. The thickness of the gasket is identified by the number of notches on its edge.
Piston protrusion (motors below SN 79876): | |
– less than 0.84 mm | gasket thickness 1.58 mm (designation: 2 notches) |
– more than 0.84 mm | gasket thickness 1.70 mm (designation: 3 notches) |
Piston protrusion (engines above SN 79876): | |
– from 0.69 to 0.79 mm | Gasket thickness 1.53 mm (designation: 2 notches) |
– from 0.79 to 0.89 mm | gasket thickness 1.63 mm (designation: 3 notches) |
– more than 0.89 mm | gasket thickness 1.73 mm (designation: 4 notches) |
Only new types of gaskets are manufactured as spare parts (three thicknesses) | |
Cylinder block
A cast iron cylinder block has cylinders molded directly into its material. 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 |
| Diameters of bores of sockets of directing pushers of valves: | |
| - nominal size | 24.00 - 24.03 mm |
| - repair size | 24.20 - 24.23 mm |
Crank mechanism
Crankshaft
| The crankshaft is forged from steel along with four counterweights and rests on five main bearings. | |
| Axial play | 0.08 - 0.29 mm |
| Diameters of main journals: | |
| - 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 |
| The length of the main necks: | |
| – front | 38.40 - 38.55 mm |
| – intermediate | 30.40 - 30.60 mm |
| – medium | 37.76 - 37.81 mm |
| - rear | 37.84 - 38.04 mm |
| Backlash of necks in main bearings | 0.040 – 0.098 mm |
| Connecting rod diameters: | |
| - nominal size | 54.984 - 55.011 mm |
| - repair size | 54.684 - 54.711 mm |
| Length of crankpins | 36.00 - 36.10 mm |
| Thickness of thrust half rings: | |
| - nominal size | 2.30 - 2.33 mm |
| - repair size | 2.50 - 2.53 mm |
Indigenous liners
| These are thin-walled liners with a steel sheet shell and anti-friction material made of zinc-aluminum alloy. | |
| Earbud Width: | |
| - front, middle and rear | 29.80 mm |
| – intermediate | 21.80 mm |
Connecting rods
| The connecting rods are forged from steel and have an I-section profile and a straight split line at the base. | |
| Distance between the axes of the holes of the head and base | 150 mm |
| Connecting rod bushing inner diameter (after installation) | 28.0+0.02 - 28.0+0.07 mm |
| Gap of the connecting rod journal in the connecting rod bearing | 0.040 - 0.098 mm |
Connecting rod bearings
| These are thin-walled liners with a steel sheet shell and anti-friction material made of zinc-aluminum alloy. | |
| Insert thickness: | |
| – nominal | 1.819±0.003 mm |
| – repair | 1.969±0.003mm |
| Earbud Width | 29.0 mm |
Pistons
| The pistons are made of aluminum-silicon alloy. | |
| The maximum difference between the masses of a set of engine pistons must not exceed 5 g | |
| Cylinder installation method | Recesses at the bottom of the piston (for valve discs and combustion chamber) must be on the fuel pump side |
| Piston diameter (measured under the piston pin bore and parallel to the axis of that 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 |
| Protrusion of pistons 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 finger) and is fixed from longitudinal movement by two spring retaining rings | |
| Outside diameter | 27.994 – 28.000 mm |
Piston rings
| Each piston has three rings: | |
| - top | Sealing with chrome-plated, convex outer working surface |
| - average | Sealing with a conical outer working surface |
| - bottom | U-Flex oil scraper |
| Installation method: touches the middle and bottom rings, the inscription "Thor" (top) 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 |
| - bottom ring | 0.15 - 0.30 mm |
| Ring thickness: | |
| - top | 1.978 - 1.990 mm |
| - average | 1.978 - 1.990 mm |
| - bottom | 4.478 - 4.490 mm |
| Ring clearance in piston grooves | 0.032 - 0.090 mm |
Gas distribution system
The gas distribution system contains:
- camshaft installed in the cylinder block;
- pushers;
- push rods;
- valve levers and valves.
The camshaft is driven by a two-row chain from the crankshaft.
Distribution phases
| The valve timing is determined with zero valve clearance for exhaust and intake valve lift of 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 |
| - exhaust valve clearance | 0.35 mm |
Camshaft
The cast iron camshaft has thermally improved cams and is mounted in the cylinder block on three bearings.
| Neck diameters | 41.925 – 41.950 mm |
| Radial play | 0.05 - 0.11 mm |
| Axial play | 0.05 - 0.15 mm |
| Cam lift (with zero valve clearance): | |
| - intake: | 9.12 mm |
| - graduation: | 9.12 mm |
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