Are frame slider bolt TTY?

**Nismo400rgtr** · 05-31-2011, 09:07 PM

I have LightTech frame sliders with the factory rubber absorber(which is white) painted. It cracks away and eventually looks worse than if I had just left them white. I'm going to have to fork the extra dough for the black ones.

My question is, should I attempt to attain new bolts for the sliders when I undo them for the absorber change? I applied some blue threadlock to the bolts before I torqued them to the 56 Nm spec.

TIA

LiterBoy · 06-02-2011, 02:17 PM

If I understand correctly, you mean the bolts that screw through the frame into the engine? I'm not a mechanical engineer, but I would not be afraid to reuse the bolts. Since they're steel bolts anchored into the aluminum engine case, there is likely little or no stretch or distortion to be concerned with at 41 Ft. Lbs. (56 Nm). The aluminum threads would fail before the steel.

I would think for steel bolts under more stress (e.g., sprocket bolts) you would want to change them every time you removed them. Same for most aluminum bolts n critical applications.

jhanshaw · 06-02-2011, 02:26 PM

The bolts can be reused as they are not TTY.

Godzilla · 06-02-2011, 04:17 PM

Whats TTY?

LiterBoy · 06-02-2011, 04:24 PM

Quote:

Originally Posted by Godzilla

Whats TTY?

"Torque to yield." Bolts that are supposed to be torqued to a particular spec only once, then discarded if removed. Pretty common in automotive engine applications (like cylinder heads that might be ruined by over tightening), but the S1000RR may have some, too. I don't know.

**ajfreeze** · 06-02-2011, 09:20 PM

Quote:

Originally Posted by LiterBoy

"Torque to yield." Bolts that are supposed to be torqued to a particular spec only once, then discarded if removed. Pretty common in automotive engine applications (like cylinder heads that might be ruined by over tightening), but the S1000RR may have some, too. I don't know.

There are tons on the S1krr.....the case cover bolts for instance--all aluminum--single use ( don't ask how I know

)

and.....The front rotor bolts, the rear sprocket nuts, and rotor bolts.

Those are just the one's I can think of off hand. There are many more, and if you plan on doing any work, plan accordingly, my dealership has to get everything from BMW USA or Germany.....

**Nismo400rgtr** · 06-03-2011, 01:03 AM

Thanks guys. I don't have a service manual yet,so I was curious.

Any aluminum fasteners on BMW's are always one time use.

LiterBoy · 06-03-2011, 10:12 AM

Quote:

Originally Posted by ajfreeze

There are tons on the S1krr.....the case cover bolts for instance--all aluminum--single use ( don't ask how I know

)

and.....The front rotor bolts, the rear sprocket nuts, and rotor bolts.

Those are just the one's I can think of off hand. There are many more, and if you plan on doing any work, plan accordingly, my dealership has to get everything from BMW USA or Germany.....

Excellent info, especially case cover bolts, which any of us are likely to have to remove if adding protectors!

Rotor and sprocket fasteners make sense, too. High stress, critical function applications.

**1000RR** · 06-03-2011, 10:26 AM

The case cover bolts (being aluminum) are one time use, although I reused them anyway. But if you have access to a dealer, just buy the extra bolts.

As far as the rear sprocket bolts, the service CD does say to replace the nut, but I would worry MUCH less about those... they aren't aluminum and it has been my experience they are very reusable. I'm running a different rear sprocket and have re-torqued the original bolts w/no issue. I would do it again too. I will tell you that eventually they will strip. On my R6 (race bike), I've switched rear sprockets so many times, that they did end up stripping... the studs were still fine, but I did have to replace the nuts.

**ajfreeze** · 06-03-2011, 01:49 PM

Quote:

Originally Posted by 1000RR

The case cover bolts (being aluminum) are one time use, although I reused them anyway. But if you have access to a dealer, just buy the extra bolts.

As far as the rear sprocket bolts, the service CD does say to replace the nut, but I would worry MUCH less about those... they aren't aluminum and it has been my experience they are very reusable. I'm running a different rear sprocket and have re-torqued the original bolts w/no issue. I would do it again too. I will tell you that eventually they will strip. On my R6 (race bike), I've switched rear sprockets so many times, that they did end up stripping... the studs were still fine, but I did have to replace the nuts.

I was unlucky enough to have to put a case cover on, so I replaced all the bolts. The other side where I just put on a guard, I reused the bolts. I'm of the mind that reusing the sprocket nuts a few times is OK too.