Engine (Total information)
| Designation | SR |
| Engine code: | |
| Injection engines with pre-mixture of the fuel mixture (with a single nozzle) | SR20Di |
| Engines with direct fuel injection: | |
| – models "Phase I" | SR20DE |
| – models "Phase II low-specification" | SR20De |
| – models "Phase II high-specification" | SR20DE |
| Cylinder displacement | 1998 cm/cube |
| Cylinder inner diameter | 86.00 mm |
| piston stroke | 86.0 mm |
| Direction of rotation of the crankshaft | Clockwise (when viewed from the right side of the car) |
| Finding the 1st cylinder | From the drive chain of the valve timing mechanism |
| Engine operation order | 1–3–4–2 |
| Compression ratio | 9,8:1 |
| Cylinder compression pressure | |
| Rated value: | |
| – SR20Di and SR20De engines | 12.26 kgf/cm/sq |
| – SR20DE engines | 12.75 kgf/cm/sq |
| Maximum allowable compression pressure: | |
| – SR20Di and SR20De engines | 10.30 kgf/cm/sq |
| – SR20DE engines | 10.79 kgf/cm/sq |
| Maximum allowable compression difference in cylinders (for all engines) | 1.0 kgf/cm/sq |
Camshaft and hydraulic regulators
| Drive unit | From the chain |
| Number of camshaft bearings | 5 |
| Axial clearance of camshafts: | |
| – standard | 0.055 - 0.139 mm |
| - marginal | 0.20 mm |
Cam dimensions
| intake valves: | |
| – for SR20Di and SR20De engines | 37.920 - 38.110 mm |
| – for SR20DE engines | 38.408 - 38.598 mm |
| exhaust valves (for all engines) | 37.920 - 38.110 mm |
| Diameter of bearing journals of camshafts | 27.935 - 27.955 mm |
| The inner diameter of the holes for the camshaft bearing journals in the cylinder head | 28.000 - 28.021 mm |
| Clearance in the camshaft bearing journals: | |
| – standard | 0.045 - 0.086 mm |
| - marginal | 0.12 mm |
| Camshaft runout: | |
| – standard | no more than 0.02 mm |
| - limiting | 0.1 mm |
| Outer diameter of hydraulic regulator | 16.980 - 16.993 mm |
| The inner diameter of the hole for the hydraulic regulator in the cylinder head | 17.000 – 17.020 mm |
| Gap between the hydraulic regulator and the hole | 0.007 - 0.040 mm |
Engine lubrication system
| Oil pump type | Gear, driven by the toe of the crankshaft |
| Minimum oil pressure at engine operating temperature: | |
| - at idle | not lower than 0.78 kgf/cm/sq |
| – at 3000 rpm: | |
| • for SR20Di and SR20De engines | 4.0 kgf/cm/sq |
| • for SR20DE engines | 4.5 kgf/cm/sq |
| Oil pump clearances: | |
| - gap between the driven gear and the pump housing | 0.11 - 0.20 mm |
| - gap in the meshing of the teeth of the driving and driven gears | no more than 0.18 mm |
| - axial play of the driven gear | 0.05 - 0.11 mm |
| - axial play of the drive gear | 0.05 - 0.09 mm |
| – gap between the collar of the drive gear and the oil pump cover | 0.045 - 0.091 mm |
Tightening torques (in Nm.)
| Nuts of fastening of a cover of a head of the block of cylinders | 10 |
| Bolt of fastening of a pulley of a crankshaft | 147 |
| Bolt of fastening of a cover of a chain drive of the gas-distributing mechanism | 7 |
| Nuts of fastening of a tensioner of a chain | 8 |
| Crankshaft sprocket mounting bolts | 147 |
| Chain guide bolts | 16 |
| Chain tensioner shoe axle bolt | 16 |
| Camshaft bearing cap bolts: | |
| Bolts of fastening of a cover of a back neck of a cam-shaft of exhaust valves | 22 |
| Bolts of other covers | 11 |
| Bolts of fastening of a head of the block of cylinders | |
| Main bolts: | |
| – 1st tightening step | 39 |
| – 2nd tightening stage | 78 |
| Completely loosen the bolts and tighten them again with the following torque: | |
| – 3rd stage tightening | 39 ± 5 |
| – 4th tightening step | tighten by an angle of 90 - 100° |
| – 5th tightening step | tighten by an angle of 90 - 100° |
| Bolts M6 | 7 |
| Nuts and bolts of oil pan sections: | |
| Cast aluminum alloy section: | |
| - with numbers 1 - 16, tightening in the prescribed sequence | 18 |
| - with numbers 17 and 18, tightening in the prescribed sequence | 7 |
| Steel stamped section | 7 |
| Oil pan drain plug | 35 |
| Bolts of the central spar of the suspension of the power unit | 88 |
| Oil pump: | |
| – pump cover screws | 5 |
| – pump cover bolt | 5 |
| - pressure relief valve bolt | 60 |
| - bypass valve bolt | 65 |
| Oil cooler center bolt | 39 |
| Flywheel mounting bolts (torque converter drive disc) | 88 |
| Bolts of the holder of a back epiploon | 8 |
| Connecting rod cap nuts: | |
| – 1st tightening step | 15 |
| – 2nd tightening stage (when tightened with an angle wrench) | tighten by an angle of 60 - 65° |
| – 2nd tightening stage (when tightened with a torque wrench without angle scale) | 40 |
| Main bearing cap bolts | 50 |
| – 1st tightening step | 35 |
| – 2nd tightening stage (when tightened with an angle wrench) | tighten by an angle of 45 - 50° |
| – 2nd tightening stage (when tightened with a torque wrench without angle scale) | 78 |
| Bolts of fastening of the engine to the check point: | |
| – bolts with a length of less than 45 mm | 19 |
| – bolts with a length of more than 55 mm | 75 |
| Fastening parts of the right suspension of the power unit: | |
| - bolts of fastening of an arm of a support to the engine | 49 |
| – bolts of fastening of a support to an arm of the engine | 55 |
| - support pinch bolt | 49 |
| Fastening parts of the left suspension of the power unit: | |
| - support pinch bolt | 49 |
| – bolts of fastening of a support of the power unit to the check point | 49 |
| Bolts for fastening parts of the front suspension of the power unit: | |
| - bolts of fastening of an arm of a support to the engine | 49 |
| - fastening the support to the central side member (on station wagons) | 55 |
| - support pinch bolt | 70 |
| Bolts for fastening parts of the rear suspension of the power unit: | |
| - bolts of fastening of a back support to the central side member | 55 |
| - support pinch bolt | 79 |
| - support bracket bolts | 69 |