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| 28-01-2020 (636 ) | Categoria: Articles |
The following torque figures have been gathered through work we have undertaken on all smart models. This list is not exhaustive and has been based on record information made available to us. These figures are subject to change and should be used with care.
| Component | Applicable Engines | Torque |
|---|---|---|
| Pistons / Crank | ||
| Piston conrod bolts (2x per piston) | All 450, 451 & 452 engines | 15Nm + 90° |
| Piston conrod bolts (2x per piston) | CDI | 5Nm + 25Nm + 180° |
| Lower crankcase bolts (8x M8) | All 450 & 452 | 21Nm + 90° |
| Lower crankcase bolts (8x M8) | CDI | 55Nm + 90° |
| Lower crankcase bolts (M6) | All 450 & 452 | 9.5Nm |
| Oil Pump System | ||
| Oil pump sprocket | All 450 & 452 | 20Nm |
| Oil pump bolts (3x) - Initial Torque Oil pump bolts (3x) - Final Torque |
All 450 & 452 | 14Nm 9.5Nm |
| Oil pick up pipe bolts (3x) - Initial Torque Oil pick up pipe bolts (3x) - Final Torque |
All 450 & 452 | 12Nm 9.5Nm |
| Oil baffle bolts | All 451 | 24Nm |
| Oil filter body bolts - blind hole | All 450 & 452 | 12Nm |
| Oil filter body bolts - clearance hole | All 450 & 452 | 9.5Nm |
| Oil filter case | All 450 & 452 | 23Nm |
| Oil cooler water line to crankcase - initial torque Oil cooler water line to crankcase - retightening torque |
450 Brabus (55kW) & 452 | 12Nm 9.5Nm |
| Engine Timing | ||
| Timing chain hydraulic tensioner bolts (2x) | All 450 & 452 + 450 CDI | 12Nm |
| Timing case oil duct bolt (1x) | All 450 & 452 | 30Nm |
| Timing case bolts - Initial Torque Timing case bolts - Final Torque |
All 450 & 452 | 12Nm 9.5Nm |
| Timing case bolts M6 | All 451 | 10Nm |
| Timing case bolts M8 | All 451 | 23Nm |
| Bolt connecting end of crank sealing ring to crankcase | All 451 | 10Nm |
| Timing case plug | All 451 | 50Nm |
| Drive Plates / Pulleys | ||
| Belt pulley bolt into crankshaft (1x) | All 450 & 452 + CDI | 140Nm + 90° |
| Bolt holding drive plate to other end of crankshaft | 450 599cc engines only | 47.5Nm + 90° |
| Bolt holding drive plate to other end of crankshaft | All 698cc engines only + CDI | 45Nm + 90° |
| Clutch Assembly | ||
| Clutch module to drive plate bolts (3x) | All 450 & 452 | 20Nm + 90° + 10° |
| Clutch pressure plate to flywheel bolts | All 451 | 20Nm |
| Clutch release bearing to gearbox | All 450, 451 & 452 | 10Nm |
| Clutch actuator bolts | All 450, 451 & 452 | 10Nm |
| Gearbox bolts (gearbox to engine) | All 450 & 452 | 23Nm |
| Gearbox bolts (gearbox to engine) | All 451 | 45Nm |
| Gearbox oil drain plug | All 450, 451 & 452 | 43Nm |
| Gearbox assembly bolts | All 450 & 452 | 27Nm + release + 25Nm |
| Cylinder Head | ||
| Cylinder head bolts (8x) | All 450 & 452 | 21Nm + 90° + 90° + 10° |
| Cylinder head bolts (8x) | CDI | 30Nm + 90° + 90° + 90° + 10° |
| Cylinder head bolts | All 451 | 25Nm + 90°+ 90° |
| Cylinder head bolt to timing cover (2x) | All 450 & 452 | 27Nm |
| Sump | ||
| Sump bolts - Initial Torque Sump bolts - Final Torque |
All 450 & 452 | 12Nm 9Nm |
| Sump bolts - Initial Torque Sump bolts - Final Torque |
All 451 | 10Nm 10Nm |
| Dipstick tube bolt (1x) - Initial Torque Dipstick tube bolt (1x) - Final Torque |
All 450 & 452 | 12Nm 9Nm |
| Sump drain plug | All 451 | 65Nm |
| Camshaft | ||
| Camshaft sprocket bolt (1x) | All 450 & 452 | 21Nm + 90°+ 10° |
| Camshaft cap bolt (2x per cap) - Initial Torque Camshaft cap bolt (2x per cap) - Final Torque |
450 599cc engines only | 11Nm 8.4Nm |
| Camshaft cap bolt (2x per cap) - Initial Torque Camshaft cap bolt (2x per cap) - Final Torque |
All 698cc engines | 12Nm 12Nm |
| Rocker Cover | ||
| Rocker cover bolts - Initial Torque Rocker cover bolts - Final Torque |
All 450 & 452 | 12Nm 9.5Nm |
| Rocker cover bolts | All 451 | 10Nm |
| Load bleed plate to crankcase bolts | All 451 | 10Nm |
| Ignition Coils | ||
| Coil pack bolts (2x per coil pack) | All 450 & 452 | 14Nm |
| Coil pack bolts (2x per coil pack) | All 451 | 10Nm |
| Starter Motor | ||
| Starter motor securing bolt | All 450 & 452 | 23Nm |
| Starter motor securing bolt | All 451 | 42Nm |
| Constant live connection to starter motor | All 450 & 452 | 8Nm |
| Constant live connection to starter motor | All 451 | 10Nm |
| Water pump system | ||
| Water pump to carrier bolts | All 450 & 452 | 9.5Nm |
| Water pump carrier to crankcase bolt | All 450 & 452 | 20Nm |
| Water pump pulley to water pump | All 450, 451 & 452 | 10Nm |
| Turbo water pipes banjo bolts | All 450 only | 19Nm |
| Turbo water pipes banjo bolts | All 452 only | 20Nm |
| Thermostat to cylinder head - initial torque Thermostat to cylinder head - final torque |
All 450 & 452 | 12Nm 9.5Nm |
| Water supply connection to carrier - initial torque Water supply connection to carrier - final torque |
All 450 & 452 | 14Nm 9.5Nm |
| Water pump to timing case - M6 | All 451 | 10Nm |
| Water pump to timing case - M8 | All 451 | 23Nm |
| Thermostat housing bolts | All 451 | 10Nm |
| Coolant pipe bolts (crankcase & oiil pan) | All 451 | 10Nm |
| Coolant Drain Plug | All 450 & 452 | 12Nm |
| Inlets | ||
| Fuel rail bolts (to inlet manifold - 2x) | All 450 & 452 | 8Nm |
| Fuel rail bolts (to inlet manifold) | All 451 | 9Nm |
| Fuel rail to air inlet pipe | All 451 | 9Nm |
| Throttle body bolts (to inlet manifold) | All 450, 451 & 452 | 9Nm |
| Inlet manifold bolts - Initial Torque Inlet manifold bolts - Final Torque |
All 450 & 452 | 12Nm 10Nm |
| Inlet manifold bolts - Initial Torque Inlet manifold bolts - Final Torque |
All 451 | 20Nm 20Nm |
| Turbo System | ||
| Turbo oil pipe bolts (2x) | 450 599cc engines only | 7.6Nm |
| Turbo oil pipe bolts (2x) | All 698cc engines | 8Nm |
| Turbo oil line banjo bolt (to crankcase 1x) | All 450 & 452 | 10Nm |
| Wastegate actuator securing bolts (2x) | All 450 & 452 | 7Nm |
| Turbo exhaust manifold studs (7x on 599cc, 8x on 698cc) | All 450 & 452 | 6Nm |
| Turbo exhaust manifold nuts (7x on 599cc, 6x on 698cc) | All 450 & 452 | 16Nm |
| Combination valve line nuts on exhaust manifold (2x) | All 698cc engines only | 10Nm |
| Exhaust studs (2x) | 450 599cc & 452 | 8.5Nm |
| Exhaust studs (2x) | 450 698cc engines only | 9Nm |
| Banjo bolt for exhaust line to combination valve (1x) | All 698cc engines only | 34Nm |
| Bolt for combination valve to cylinder head (1x) | All 698cc engines only | 12Nm |
| Alternator | ||
| Alternator wiring nuts | All 450 & 452 | 8Nm |
| Alternator wiring nuts | All 451 | 10Nm |
| Alternator carrier bolts | 599cc engines only | 27.5Nm |
| Alternator carrier bolts | 698cc engines | 25Nm |
| Alternator bracket to crankcase bolt | 599cc engines only | 27Nm |
| Alternator bracket to crankcase bolt | 698cc engines | 25Nm |
| Alternator bracket to crankcase - M8 | All 450 & 452 | 9.5Nm |
| Alternator bracket to crankcase - M6 | All 450 & 452 | 12Nm |
| Alternator adjusting nut | 599cc engines only | 27.5Nm |
| Alternator adjusting nut | 698cc engines | 25Nm |
| Alternator to timing case cover bolt | All 451 | 23Nm |
| Belt Drives | ||
| Alternator belt tensioner to timing case bolt (1x) | All 450 & 452 | 20Nm |
| Airconditioning belt tensioner to timing case cover (1x) | All 450 (with aircon) | 20Nm |
| Main belt tensioner to timing case cover (1x) | All 451 | 49Nm |
| Airconditioning belt tensioner eccentric bolt (1x) | All 450 & 452 (with aircon) | 21Nm |
| TIK | ||
| TIK bracket to gearbox bolts (2x) - Initial Torque TIK bracket to gearbox bolts (2x) - Final Torque |
All 450 & 452 | 12Nm 9Nm |
| Spark plugs | ||
| Spark plugs - Initial Torque Spark plugs - Final Torque |
599cc engines only | 23Nm 23m |
| Spark plugs - Initial Torque Spark plugs - Final Torque |
698cc engines only | 28Nm 20Nm |
| Spark plugs - Initial Torque Spark plugs - Final Torque |
All 451 | 18Nm 18Nm |
| Sensors and Switches | ||
| Oil pressure switch | All 450 & 452 | 18Nm |
| Oil pressure switch | All 451 | 10Nm |
| Lambda O2 sensors (both sensors if applicable) | All 450 & 452 + CDI | 50Nm |
| Lambda O2 sensor - upstream | All 451 | 50Nm |
| Lambda O2 sensor - downstream | All 451 | 40Nm |
| MAP sensor bolt (1x) | All 450 & 452 | 6Nm |
| Knock sensor bolt (1x) | All 450, 451 & 452 | 20Nm |
| TDC sensor bolt (1x) | All 450 & 452 | 12Nm |
| TDC sensor bolt (1x) | All 451 | 11Nm |
| Camshaft position sensor | All 451 | 11Nm |
| Gear position sensor | All 450 & 452 | 10Nm |
| Gearbox temperature sensor | 599cc pre-2000 only | 10Nm |
| Gearbox RPM sensor | All 450 & 452 | 10Nm |
| ECU securing bolts | All 450 & 452 + 450 CDI | 2Nm |
| Engine Mounts | ||
| Engine mount - cylinder head bolts - Initial Torque Engine mount - cylinder head bolts - Retightening Torque |
All 450 & 452 | 28Nm 23Nm |
| Engine mount - back of crankcase - Initial Torque Engine mount - back of crankcase - Retightening Torque |
All 450 & 452 | 28Nm 23Nm |
| Engine mount - gearbox - Initial Torque Engine mount - gearbox - Retightening Torque |
All 450 & 452 | 28Nm 23Nm |
| Engine mount to subframe bolts | All 450 & 452 | 58Nm |
| Engine mount - right engine to frame | All 451 | 56Nm |
| Engine mount - right engine to timing case | All 451 | 80Nm |
| Engine mount - left engine to carrier | All 451 | 56Nm |
| Engine mount - left engine to transmission | All 451 | 80Nm |
| Torque support engine mounts | All 451 | 115Nm |
| Carrier for front engine mount to transmission | All 451 | 23Nm |
| Carrier for front engine mount to crankcase | All 451 | 56Nm |
| Suspension System | ||
| Front suspension arm top nut | All 450, 451 & 452 | 45Nm |
| Suspension arm top spring plate nut | All 450, 451 & 452 | 60Nm |
| Suspension arm C-clamp on rear of hub | All 450 & 452 | 46Nm |
| Suspension arm C-clamp on rear of hub | All 451 | 30Nm + 180° |
