Brammo Owners Forum

Brammo Empulse Discussion => Brammo Empulse FAQ => Topic started by: KaFr on March 15, 2021, 06:09:50 PM

Title: Correct tightening torque value for the rear axle nut
Post by: KaFr on March 15, 2021, 06:09:50 PM: I am very confused about the very high value of the tightening torque for the rear axle nut, which is given in the user and service manual for Victory Empulse TT.
The specified tightening torque is 70 ft lbs (95 Nm). :o
This is almost twice as much as stated in the manuals for Brammo Empulse R or Brammo Enertia+ (40 ft lbs (55 Nm)) !!!

Am I correctly assuming that the manual for Victory Empulse TT contains an incorrect tightening torque value?
Title: Re: Correct tightening torque value for the rear axle nut
Post by: Shinysideup on March 15, 2021, 10:18:24 PM: Whoa! That IS quite a difference!

IIRC, the Brammo value was considered atypically low by shop mechanics, but I have not definitive answer for you.

If I were you, I'd get in touch with Polaris, because erring either way could be what we'd call: VERY BAD.
Title: Re: Correct tightening torque value for the rear axle nut
Post by: Richard230 on March 16, 2021, 09:16:07 AM: A couple of my ICE motorcycles use rear axle tightening torque values of around 125 Nm. I have no idea why the torque needs to be that high. I wish they would use a lower torque and a cotter pin through the axle nut to make sure it doesn't loosen as was common back in the day.
Title: Re: Correct tightening torque value for the rear axle nut
Post by: HadesOmega on March 20, 2021, 02:36:00 AM: I have removed and reinstalled the rear wheel and torqued it and never had problems with it. Never had the wheel come off on the race track =P
Title: Re: Correct tightening torque value for the rear axle nut
Post by: KaFr on March 21, 2021, 03:14:09 PM: Now I'm a little more confused. :o :o :o
The rear axle nut tightening torque value is 40.5 ft lbs (55 Nm) on page 10.3!!! This is a different value than on page 2.17 (70 ft lbs (95 Nm)).
It will probably be best to measure the torque when loosening the nut or use a mark for the position of the tightened nut before loosening it.
Title: Re: Correct tightening torque value for the rear axle nut
Post by: Richard230 on March 21, 2021, 04:20:36 PM: Quote from: KaFr on March 21, 2021, 03:14:09 PM
Now I'm a little more confused. :o :o :o
The rear axle nut tightening torque value is 40.5 ft lbs (55 Nm) on page 10.3!!! This is a different value than on page 2.17 (70 ft lbs (95 Nm)).
It will probably be best to measure the torque when loosening the nut or use a mark for the position of the tightened nut before loosening it.

I would use a mark on both the nut and another nearby fixed point, like the swing arm. Then tighten the nut so that the marks line up again. Measuring the torque while loosening the nut will not work. It will give an incorrect value.
Title: Re: Correct tightening torque value for the rear axle nut
Post by: Shinysideup on March 22, 2021, 05:37:30 PM: I still have a PDF of the 2013-2014 Brammo Empulse/Empulse R Service Manual and it specifies 55 Nm for the rear axle nut.
If that helps.
Title: Re: Correct tightening torque value for the rear axle nut
Post by: KaFr on March 24, 2021, 04:16:41 PM: Yes, the correct value of the tightening torque of the rear axle nut will most likely be the same for both Brammo and Victory.