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Wheel nuts, tightening


Phil and Lol

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Tracker - 2016-05-28 9:38 PM

 

Should be clearly defined in the Fiat handbook, or a Google search if you don't have a handbook, or a phone call to a Fiat dealer quoting the chassis number and year.

 

One might reasonably believe that any of those options would provide a uncontroversial answer, but this earlier discussion will show that - at least where the current Fiat Ducato is concerned - this ain’t so.

 

http://forums.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/Fiat-Ducato-X290-wheel-bolt-torque/38394/

 

As current (X290) Ducatos can now have 15” or 16” diameter wheels as original equipment (OE), the simplest policy would seem to be to tighten the wheel-bolts according to the specification of the bolts rather than according to the diameter of the wheels.

 

Consequently M14 bolts would be torqued to 160Nm/118ft.lb and M16 bolts to 180Nm/133ft.lb and (as far as I’m aware) those settings would apply irrespective of whether OE wheels are steel or alloy.

 

Phil and Lol’s inquiry relates to a 2011 Auto-Trail Comanche (built on a tandem-rear-axle Al-KO ‘heavy’ Ducato chassis with 16” diameter wheels attached via M16 bolts), so the recommended torque-setting will be 180Nm/133ft.lb

 

(As a follow-up to the 2015 forum thread I provided a link to above, when 16”-diameter OE steel or alloy wheels are specified for a Ducato X290 ‘light’ chassis no changes are made to the hub assembly. Thus a Ducato ‘light’ chassis will always have M14 wheel-bolts irrespective of the diameter of its wheels.)

 

 

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