Torque Settings Fortwo, Forfour And Roadster

Smart ForTwo 450 Engine

Cylinder head at crankcase (new bolts only):
Petrol M160 EU2 & EU3	21.0Nm + 2x90degree + 10 degrees
Petrol M160/1 EU4	21.0Nm +2x90degree + 10 degrees
Diesel OM660 EU3	30.0Nm + 3x90degree + 10 degrees

Cylinder head cover at cylinder head:
Petrol M160 EU2 & EU3	(New only) 12.0Nm
Petrol M160/1 EU4	(New) 12.0Nm, (Used) 9.5Nm
Diesel OM660 EU3	(New only) 12.0Nm

Oil pan at crankcase:
Petrol M160 EU2 & EU3	(New only) 12.0Nm
Petrol M160/1 EU4	(New) 12.0Nm, (Used) 8.4Nm
Diesel OM660 EU3	(New only) 12.0Nm

Water Pump at major assembly carrier (new only):
Petrol M160 EU2 & EU3	9.5Nm
Petrol M160/1 EU4	14.0Nm
Diesel OM660 EU3	9.5Nm

Oil intake tube at crankcase:
Petrol M160 EU2 & EU3	(New only) 14.0Nm
Petrol M160/1 EU4	(New) 14.0Nm, (Used) 9.5Nm
Diesel OM660 EU3	(New only) 14.0Nm

Exhaust to turbo manifold:
Petrol M160 EU2 & EU3	(New only) 30.0Nm
Petrol M160/1 EU4	(New only) 30.0Nm
Diesel OM660 EU3	(New only) 30.0Nm

Exhaust Manifold at cylinder head (new & used):
Petrol M160 EU2 & EU3	16.0Nm
Petrol M160/1 EU4	16.0Nm
Diesel OM660 EU3	23.0Nm

Water Drain Plug:
All Engines	12.0Nm

Glow Plug:
Diesel OM660 EU3	(new & used) 15.0Nm

Go to Top

Smart ForTwo 450 Chassis (all engines)

ForTwo road wheels	110Nm
Lower ball joint nut	46Nm +/-4.6Nm
Brake caliper at pivot bearing	(new & used) 115Nm +/-5Nm
Wheel bearing stretch bolt	120Nm +/-12Nm
Front axle shock absorber at support bearing (transverse leaf spring)	60Nm +/-6Nm
Shock absorber strap (transverse leaf spring)	46Nm +/-6Nm
Shock absorber top nut (MacPherson strut)	45Nm +/-4.5Nm
Shock absorber strap (MacPherson strut)	46Nm +/-4.6Nm
Lower ball joint bolts	40Nm +/-4Nm
Steering ball joint bolts	40Nm +/- 4Nm
Front axle wishbone control arm at front sub frame	120Nm +/-12Nm
Drop link to wishbone nut	46Nm
Sway bar bush housing	85Nm
Steering gear at front sub frame	46Nm +/-4.6Nm
Front sub frame to body	85Nm +/-10Nm
Rear central wheel bearing bolt into driveshaft	30Nm + 90 Degrees
Rear axle shock absorber at frame-type integral support bearing bracket	65Nm +/-6.5Nm
Rear axle shock absorber at axle tube	65Nm +/-6.5Nm
X-frame bar end to axle tube	100Nm

Go to Top

Smart ForTwo 450 and Roadster Transmission

Filler plug, transmission oil	43.0Nm
Drain plug, transmission oil	43.0Nm
Transmission at engine	23.0Nm
Engine mount at transmission	28.0Nm
Engine mount at frame-type integral support	58.0Nm
Starter at transmission housing	23.0Nm
Clutch release at transmission	10.0Nm
Modular clutch at flexible plate	20.0Nm +90degree +/- 5degree

Go to Top

Smart Fortwo 451 Engine

Coolant drain plug	12Nm
Cylinder head bolts (wet threads)	25Nm +90° +90°
Oil pan sump	10Nm
Timing chain tensioner to cylinder head	23Nm
Timing chain slide rail to cylinder head	10Nm
Timing chain slide rail to crankcase	10Nm
Camshaft solenoid to cylinder head	11Nm
Turbo coolant banjo bolt to cylinder head	31Nm
Turbo bracket to cylinder head	23Nm
Exhayst manifold to cylinder head	34Nm
Exhaust manifold shield	11Nm
Camshaft position sensor to cylinder head	11Nm
Coolant temperature sensor to cylinder head	30Nm
Coolant line to cylinder head	24Nm
AC compressor	20Nm
Oil drain screw	65Nm (seems excessive)
Oil filter to timing case cover	14Nm
Cylinder head cover	10Nm
Connecting rod bearing cap	15Nm + 90°
Coolant pump to timing case cover	M6 = 10Nm.   M8 = 23Nm

Smart Fortwo 451 Transmission

Flywheel to crankshaft	20Nm + 90°
Drain plug	43Nm
Fill plug	43Nm

Smart Fortwo 451 Chassis

X-frame upper bolts	65Nm
X-frame lower bolts	90Nm
Wheel bolts	112Nm

Smart Roadster 452 Engine

Cylinder head at crankcase (new bolts only):
Petrol M160/1 EU4	21.0Nm +2x90degree + 10 degree

Cylinder head cover at cylinder head:
Petrol M160/1 EU4	(New) 12.0Nm, (Used) 12.0Nm

Oil pan at crankcase:
Petrol M160/1 EU4	(New) 12.0Nm, (Used) 8.4Nm

Water Pump at major assembly carrier (new only):
Petrol M160/1 EU4	14.0Nm

Oil intake tube at crankcase (new only):
Petrol M160/1 EU4	14.0Nm

Exhaust Manifold at cylinder head (new & used):
Petrol M160/1 EU4	16.0Nm

Water Drain Plug:
All engines	12.0Nm

Spark Plug (new & used):
Petrol M160/1 EU4	(New) 27.5 Nm, (Used) 22.5 Nm

Go to Top

Smart Roadster 452 Chassis (all engines)

Roadster road wheels	120Nm
Lower ball joint nut	46Nm +/-4.6Nm
Brake caliper at pivot bearing	(new & used) 115Nm +/-5Nm
Wheel bearing stretch bolt	120Nm +/-12Nm
Shock absorber top nut (MacPherson light)	45Nm +/-4.5Nm
Shock absorber strap (MacPherson light)	46Nm +/-4.6Nm
Lower ball joint bolts	40Nm +/-4Nm
Steering ball joint bolts	40Nm +/- 4Nm
Front axle wishbone control arm at front sub frame	120Nm +/-12Nm
Drop link to wishbone nut	46Nm
Sway bar bush housing	85Nm
Steering gear at front sub frame	46Nm +/-4.6Nm
Front sub frame to body	85Nm +/-10Nm
Rear central wheel bearing bolt into driveshaft	30Nm + 90 Degrees
Rear axle shock absorber at frame-type integral support bearing bracket	65Nm +/-6.5Nm
Rear axle shock absorber at axle tube	65Nm +/-6.5Nm

Go to Top

Smart ForFour 454 Petrol M135 Engine

Cylinder head	24.5Nm +2x90degree
Cylinder head cover	8.0Nm
Oil pan	7.5Nm
Oil filter	14.0Nm
Oil filter connection	27.0Nm
Oil intake bell	8.5Nm
Water pump	8.5Nm
Timing case cover M6	8.5Nm
Timing case cover M10	39.0Nm
Intake manifold/bracket for intake manifold in engine block	18.5Nm
Exhaust manifold	34.0Nm
Spark plugs	25.0Nm

Go to Top

Smart ForFour 454 Transmission

Filler plug, transmission oil	43.0Nm
Drain plug, transmission oil	43.0Nm
Transmission at engine	25.0Nm
Engine mount at transmission	40.0Nm
Starter at transmission housing	20.0Nm
Clutch release at transmission	20.0Nm
Pressure plate at flywheel	19.0Nm
Clutch actuator	12.0Nm

Go to Top

Odds & Sods

Camshaft	10Nm
Inlet manifold to head	10Nm
Front hub	120Nm
Rear hub	30Nm + 90 degrees
Track rod end	40Nm
ForTwo road wheels	110Nm
Roadster road wheels	120Nm
Oil filter housing	Smart recommend 25Nm I do mine to about 15Nm.
Sump drain plug	30Nm
Spark plug EU2 & EU3 M160 engine	(New) 27.5 Nm, (Used) 20.0 Nm
Spark plug EU4	(New) 27.5 Nm, (Used) 22.5 Nm
Exhaust to manifold nut	30Nm
Exhaust bolts on upper & lower of exhaust bracket	25Nm
Exhaust bracket rear bolt onto transmission box	23Nm