Menu

User Menu

user_mobilelogo

User Menu

Contact Us

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.

Pistons / CrankApplicable ModelsTorque
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 (13x M6) All 450 & 452 9.5Nm
Oil Pump SystemApplicable ModelsTorque
Oil pump sprocket (1x) All 450 & 452 20Nm
Oil pump bolts (3x) - Initial Torque
Oil pump bolts (3x) - Final Torque
All 450 & 452 12Nm
9.5Nm
Oil pick up pipe bolts (3x) - Initial Torque
Oil pick up pipe bolts (3x) - Final Torque
All 450 & 452 14Nm
9.5Nm
Oil baffle bolts All 451 24Nm
Oil filter body bolts - blind hole (3x) All 450 & 452 12Nm
Oil filter body bolts - through hole (2x) All 450 & 452 9.5Nm
Oil filter case All 450 & 452 23Nm
Oil cooler water line to crankcase (2x) - initial torque
Oil cooler water line to crankcase (2x) - retightening torque
450 Brabus (55kW) & 452 12Nm
9.5Nm
Timing chain oil sprayer to crankcase (1x) All 450 & 452 20Nm
Piston oil sprayer (1x per cylinder) All 450 & 452 20Nm
Oil plug to crankcase (accessed behind clutch) All 450 & 452 30Nm
Engine TimingApplicable ModelsTorque
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 plate / PulleysApplicable ModelsTorque
Belt pulley bolt into crankshaft (1x) All 450 & 452 + CDI 140Nm + 90°
Bolt holding drive plate to clutch end of crankshaft (6x) 450 599cc engines only 47.5Nm + 90°
Bolt holding drive plate to clutch end of crankshaft (6x) All 698cc engines only + CDI 45Nm + 90°
Clutch and GearboxApplicable ModelsTorque
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 (2x) All 450, 451 & 452 10Nm
Clutch actuator bolts (3x) All 450, 451 & 452 10Nm
Gearbox bolts (gearbox to engine 2x) All 450 & 452 23Nm
Gearbox bolts (gearbox to engine) All 451 45Nm
Gearbox oil fill and drain plugs (2x) All 450, 451 & 452 43Nm
Gearbox assembly bolts All 450 & 452 27Nm + release + 25Nm
Cylinder HeadApplicable ModelsTorque
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
SumpApplicable ModelsTorque
Sump bolts (14x) - Initial Torque
Sump bolts (14x) - 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
Cam ShaftApplicable ModelsTorque
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 CoverApplicable ModelsTorque
Rocker cover bolts (6x for 599c or 5x for 698cc) - Initial Torque
Rocker cover bolts (6x for 599c or 5x for 698cc) - Final Torque
All 450 & 452 12Nm
9.5Nm

Rocker cover breather channel plate bolts (2x) - Initial Torque

Rocker cover breather channel plate bolts (2x) - Final Torque

All 450 & 452

12Nm

9.5Nm

Rocker cover bolts All 451 10Nm
Load bleed plate to crankcase bolts All 451 10Nm
Ignition CoilsApplicable ModelsTorque
Coil pack bolts (2x per coil pack) All 450 & 452 14Nm
Coil pack bolts (2x per coil pack) All 451 10Nm
Starter MotorApplicable ModelsTorque
Starter motor bolts (2x) All 450 & 452 23Nm
Starter motor bolts All 451 42Nm
Constant live connection to starter motor (1x) All 450 & 452 8Nm
Constant live connection to starter motor All 451 10Nm
Water pump systemApplicable ModelsTorque
Water pump to carrier bolts (7x) All 450 & 452 9.5Nm
Water pump carrier to crankcase bolt (4x) All 450 & 452 20Nm
Water pump pulley to water pump (4x) 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 (2x) - initial torque
Thermostat to cylinder head (2x) - final torque
All 450 & 452 12Nm
9.5Nm
Water supply connection to carrier (2x) - initial torque
Water supply connection to carrier (2x) - 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
InletsApplicable ModelsTorque
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 (4x) All 450, 451 & 452 9Nm
Inlet manifold bolts (6x) - Initial Torque
Inlet manifold bolts (6x) - Final Torque
All 450 & 452 12Nm
10Nm
Inlet manifold bolts - Initial Torque
Inlet manifold bolts - Final Torque
All 451 20Nm
20Nm
Turbo SystemApplicable ModelsTorque
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 manifold studs (7x on 599cc, 8x on 698cc) All 450 & 452 6Nm
Turbo 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 rocker cover head (1x) All 698cc engines only 12Nm
Catalytic converter pre-heater to subframe bolts (3x) All 698cc engines only 23Nm
Exhaust SystemApplicable ModelsTorque
Exhaust bolts to gearbox (2x) All 450 & 452 23Nm
AlternatorApplicable ModelsTorque
Alternator wiring nuts (2x) All 450 & 452 8Nm
Alternator wiring nuts All 451 10Nm
Alternator carrier bolt (1x) 599cc engines only 27.5Nm
Alternator carrier bolt (1x) 698cc engines 25Nm
Alternator bracket to crankcase bolt (1x) 599cc engines only 27Nm
Alternator bracket to crankcase bolt (1x) 698cc engines 25Nm
Alternator tensioner arm to timing case - M8 All 450 & 452 9.5Nm
Alternator tensioner arm to timing case - M6 All 450 & 452 12Nm
Alternator tensioner adjusting nut 599cc engines only 27.5Nm
Alternator tensioner adjusting nut 698cc engines 25Nm
Alternator to timing case cover bolt All 451 23Nm
Belt DrivesApplicable ModelsTorque
Airconditioning belt tensioner to timing case cover (2x) 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
Induction AirApplicable ModelsTorque
TIK bracket to gearbox bolts (2x) - Initial Torque
TIK bracket to gearbox bolts (2x) - Final Torque
All 450 & 452 12Nm
9Nm
Spark plugsApplicable ModelsTorque
Spark plugs - Initial Torque
Spark plugs - Final Torque
599cc engines only 23Nm
23Nm
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 SwitchesApplicable ModelsTorque
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 screws (6x) All 450 & 452 + 450 CDI 2Nm
Engine MountsApplicable ModelsTorque
Engine mount - cylinder head bolts (2x) - Initial Torque
Engine mount - cylinder head bolts (2x) - Retightening Torque
All 450 & 452 28Nm
23Nm
Engine mount - back of crankcase (2x) - Initial Torque
Engine mount - back of crankcase (2x) - Retightening Torque
All 450 & 452 28Nm
23Nm
Engine mount - gearbox (2x) - Initial Torque
Engine mount - gearbox (2x) - Retightening Torque
All 450 & 452 28Nm
23Nm
Engine mount to subframe bolts (2x per mount) 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
Engine Subframe AssemblyApplicable ModelsTorque
Torsion bar (K-Bar) to subframe bolts (2x) All 450 65Nm
Torsion bar (K-Bar) to rear axle (lower nuts and bolts) All 450 100Nm
Rear axle tube to subframe (single nut and bolt) All 450 120Nm
Subframe to chassis bolts (4 bolts: 2 long, 2 short) All 450 100Nm
Suspension SystemApplicable ModelsTorque
Front suspension arm top nut All 450, 451 & 452 45Nm
Front suspension arm top spring plate nut All 450, 451 & 452 60Nm
Front suspension arm C-clamp on rear of hub All 450 & 452 46Nm
Front suspension arm C-clamp on rear of hub All 451 30Nm + 180°
Rear shock absorber mounting nut and bolt (top) All 450 & 452 65Nm
Rear shock absorber mounting nut and bolt (bottom) 450 (698cc) & 452 65Nm
Rear shock absorber mounting bolt into captive nut (bottom) 450 (599cc) 65Nm
Anti Roll BarsApplicable ModelsTorque
 Rear clamps holding rubber bushing to axle tube (2 bolts either side) All 450 20Nm
 Rear anti roll bar to drop link bolt (1 either side) All 450 40Nm
Airconditioning SystemApplicable ModelsTorque
Refrigerant pipes to compressor (in engine) All 450 & 452 20Nm
Refrigerant compressor mounting arm to cylinder head All 450 10Nm
Refrigerant compressor to mounting bracket bolt All 450 20Nm
Refrigerant compressor long bolt through water carrier All 450 20Nm
Wheels and HubsApplicable ModelsTorque
Driveshaft bolt to rear wheel bearing All 450 30Nm + 90°
Rear wheel bearing to axle tube (4 bolts each side) All 450 & 452 58Nm