Table of contents: Engine (general information) ↓ Camshaft and hydraulic adjusters ↓ Cam sizes ↓ Engine lubrication system ↓ Tightening torques (in Nm) ↓
Engine (general information)
| Designation | SR |
| Engine code: | |
| Injection engines with preliminary preparation of fuel mixture (with a single nozzle) | SR20Di |
| Direct injection engines: | |
| - "Phase I" models | SR20DE |
| - models "Phase II low-specification" | SR20DE |
| - models "Phase II high-specification" | SR20DE |
| Working volume of cylinders | 1998 cm/cube |
| Inner diameter of the cylinder | 86.00 mm |
| Piston stroke | 86.0 mm |
| Direction of rotation of the crankshaft | Clockwise (if you look from the right side of the car) |
| Finding the 1st cylinder | From the timing chain drive side |
| Engine operating order | 1–3–4–2 |
| Compression ratio | 9,8:1 |
| Compression pressure in cylinders | |
| Nominal value: | |
| – SR20Di and SR20De engines | 12.26 kgf/cm² |
| – SR20DE engines | 12.75 kgf/cm² |
| Maximum allowable compression pressure: | |
| – SR20Di and SR20De engines | 10.30 kgf/cm/sq |
| – SR20DE engines | 10.79 kgf/cm² |
| Maximum permissible difference in compression in cylinders (for all engines) | 1.0 kgf/cm/sq |
Camshaft and hydraulic adjusters
| Drive | From the chain |
| Number of camshaft bearings | 5 |
| Axial clearance of camshafts: | |
| - standard | 0.055 – 0.139 mm |
| - ultimate | 0.20 mm |
Cam sizes
| Inlet 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 camshaft bearing journals | 27.935 – 27.955 mm |
| Inner diameter of the holes for the camshaft bearing journals in the cylinder head | 28,000 – 28,021 mm |
| Clearance in camshaft bearing journals: | |
| - standard | 0.045 – 0.086 mm |
| - ultimate | 0.12 mm |
| Camshaft runout: | |
| - standard | no more than 0.02 mm |
| - limit | 0.1 mm |
| External diameter of the hydraulic regulator | 16,980 – 16,993 mm |
| Inner diameter of the hole for the hydraulic regulator in the cylinder head | 17,000 – 17,020 mm |
| The gap between the hydraulic regulator and the hole | 0.007 – 0.040 mm |
Engine lubrication system
| Oil pump type | Gear-driven, with crankshaft nose drive |
| Minimum oil pressure at engine operating temperature: | |
| - at idle | not less than 0.78 kgf/cm² |
| – at 3000 rpm: | |
| * for SR20Di and SR20De engines | 4.0 kgf/cm/sq |
| • for SR20DE engines | 4.5 kgf/cm² |
| Oil pump clearances: | |
| – clearance between the driven gear and the pump body | 0.11 – 0.20 mm |
| – clearance in the engagement of the teeth of the driving and driven gears | no more than 0.18 mm |
| – axial clearance of the driven gear | 0.05 – 0.11 mm |
| – axial play of the drive gear | 0.05 – 0.09 mm |
| – clearance between the flange of the drive gear and the oil pump cover | 0.045 – 0.091 mm |
Tightening torques (in Nm)
| Cylinder head cover fastening nuts | 10 |
| Crankshaft pulley mounting bolt | 147 |
| Timing chain cover fastening bolt | 7 |
| Chain tensioner mounting nuts | 8 |
| Crankshaft drive sprocket mounting bolts | 147 |
| Chain guide mounting bolts | 16 |
| Chain tensioner shoe axle bolt | 16 |
| Camshaft journal cover bolts: | |
| Exhaust camshaft rear journal cover mounting bolts | 22 |
| Bolts of the remaining covers | 11 |
| Cylinder head mounting bolts | |
| Main bolts: | |
| – 1st stage of tightening | 39 |
| – 2nd stage of tightening | 78 |
| Loosen the bolts completely and retighten to the following torque: | |
| – 3rd stage of tightening | 39±5 |
| – 4th stage of tightening | turn to an angle of 90 – 100° |
| – 5th stage of tightening | turn to an angle of 90 – 100° |
| Bolts M6 | 7 |
| Oil pan section nuts and bolts: | |
| Cast aluminum alloy section: | |
| – with numbers 1 – 16, tightening in the established sequence | 18 |
| - with numbers 17 and 18, tightening in the established sequence | 7 |
| Steel stamped section | 7 |
| Oil pan drain plug | 35 |
| Powertrain suspension center member bolts | 88 |
| Oil pump: | |
| – pump cover screws | 5 |
| – pump cover bolt | 5 |
| - pressure reducing valve bolt | 60 |
| - relief valve bolt | 65 |
| Oil cooler center bolt | 39 |
| Flywheel mounting bolts (torque converter drive disk) | 88 |
| Rear Oil Seal Holder Bolts | 8 |
| Connecting rod cap fastening nuts: | |
| – 1st stage of tightening | 15 |
| – 2nd stage of tightening (when tightening with a wrench with an angle scale) | turn to an angle of 60 – 65° |
| – 2nd stage of tightening (when tightening with a torque wrench without an angle scale) | 40 |
| Main bearing cap bolts | 50 |
| – 1st stage of tightening | 35 |
| – 2nd stage of tightening (when tightening with a wrench with an angle scale) | turn to an angle of 45 – 50° |
| – 2nd stage of tightening (when tightening with a torque wrench without an angle scale) | 78 |
| Engine to gearbox mounting bolts: | |
| – bolts with a length less than 45 mm | 19 |
| – bolts longer than 55 mm | 75 |
| Fastening of the right powertrain suspension parts: | |
| – bolts for fastening the support bracket to the engine | 49 |
| – bolts for fastening the support to the engine bracket | 55 |
| - support tie bolt | 49 |
| Fastening of the left suspension parts of the power unit: | |
| - support tie bolt | 49 |
| – bolts for fastening the power unit support to the gearbox | 49 |
| Bolts for fastening parts of the front suspension of the power unit: | |
| – bolts for fastening the support bracket to the engine | 49 |
| – fastening the support to the central spar (on station wagons) | 55 |
| - support tie bolt | 70 |
| Bolts for fastening parts of the rear suspension of the power unit: | |
| – bolts for fastening the rear support to the central side member | 55 |
| - support tie bolt | 79 |
| – support bracket mounting bolts | 69 |