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Torque Specifications for Rear U Bolts on F53 Chassis Motorhome  


What would you say the torque specs would be on those huge u bolt that hold the rear springs ? Not sure i have the right torque wrench?? Thanks


Helpful Expert Reply:

The torque spec for the rear U bolts on your 2019 F53 motorhome are dependent on the size. If you have 3/4 x 16 u bolts (and used a 1 1/8" socket to remove the nuts) then they torque to 250 lb-ft. If the u bolts are 7/8 x 14 (and you used a 1 5/16" or 33mm socket to remove the nuts) they torque to 400 lb-ft.

Typically most 1/2 drive torque wrenches only go up to 250 lb-ft, so a 3/4" drive torque wrench or bigger is recommended, the additional length will also provide the leverage you'll need to reach the torque value. It is recommended that you recheck the torque after driving for a while because the suspension can settle and the bolts may not be tight enough.

One piece of advice I can give you is to have an extra set of hands help. You can turn the torque wrench while your helper holds the socket on the nut so it doesn't slip. It can be challenging to hold the socket on, and reach far out enough to turn the wrench.

expert reply by:
Robert C

Ron J.


I have a 2020 Thor Hurricane 29M on a 2019 chassis. I am going to install a RM steering stabilizer. Are the torque specs the same for the front suspension and rear suspension?

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