Author Topic: Steering Knuckle Tightening Torques  (Read 1637 times)

PeterPortugal

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Steering Knuckle Tightening Torques
« on: November 30, 2020, 21:00:42 »
Gents,

The nut & bolt which connects the outer part of the lower control arm to the steering knuckle.
Should the bolt be torqued to a specific value? I have seen 130ftlb quoted on the forum but that is a lot of torque.
Should the castellated nut be torqued to a specific value? I have seen 130ftlb quoted on the forum but that is a lot of torque

A few posters have asked this before as the info does not seem to be in the BBB. Although 130ftlb was mentioned I couldn't find any reference for the source of this value. It seems very substantial bearing in mind the nut is locked with a cotter pin.

Regards

Peter
1963 220se Cabrio
1968 280se Coupe

ja17

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Re: Steering Knuckle Tightening Torques
« Reply #1 on: December 01, 2020, 08:27:28 »
Since the control arm is threaded on both sides, and the lower knuckle is also threaded, I do not see that the torque is critical. Just get the nut tight, insert the cotter pin and it will never accidentally loosen unless you remove the pin and loosen it. The nut on the bottom of the king pin is a critical torque since it tightens the steering knuckle onto the tapered, bottom end of the king pin.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

PeterPortugal

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Re: Steering Knuckle Tightening Torques
« Reply #2 on: December 01, 2020, 08:34:44 »
Thanks Joe. That seems like sensible advice and is maybe why the torques are not given in the BBB.

1963 220se Cabrio
1968 280se Coupe