Tyres, Brakes and Suspension » Steering yoke nut

Does anyone know the torque setting for this?
I assumed it was 100NM, but after getting up to 50 NM I stopped, as it just seemed like any IMG-20240518-WA0000.jpeg - Bild entfernt (keine Rechte)more was gonna strip the whole thing out.
I was just finishing of re aligning the forks as the steering was a bit "pissed" as we say in blighty.

Fork bridge, top, to telescopic forks
M8 x 30 19 Nm
Locknut to fork-leg cap
M8 x 1.25 15 Nm
Adjustment specification, steering-head bearing
bottom slotted nut, M35 x 1 Tightening torque, 40 Nm
Swing the forks 3x to left/right
through full arc of travel
slacken (forks turned fully to the
left), 80°
Tightening torque (forks turned fully
to right), 15 Nm
Rubber washer
top slotted nut, M35 x 1
Secure with circlip
Tightening torque, 1 Nm
turn further until circlip can be
installed

Adjusting steering-head bearing (for maintenance)
Bottom slotted nut, M35 x 1 (forks turned fully to right), 15 Nm
Rubber washer
Top slotted nut, M35 x 1
Secure with circlip
Tightening torque, 1 Nm
turn further until circlip can be
installed
Cover to fixed fork tube
M52 x 1.5 20 Nm
Fork bridge, top, to steering tube
M28 x 1.5
Clean screw, thinly lubricate threads and underside of head,
Lubricant (Klüberplex Fluoropan T PTFE

On the last bit M28 x 1.5, it doesn't state the torque.

OK - dealer tells me it's 130 Nm.
Very high for a 12mm drive me thinks - but there you go.

Well report back here when you've torqued it up then!

Zitat von Craig Carter im Beitrag #4

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OK - dealer tells me it's 130 Nm.
Very high for a 12mm drive me thinks - but there you go.

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The 130nm figure is also given in the Haynes manual. That's 96 lbft.

Frank

That 130 Nm could be correct but the trouble is this looks like a nut that - on most bikes - is there to preload the steering head bearings and should be done up lightly, possibly only finger tight.

The above notes confused me so I reached for my Haynes manual and looked up REALOEM for the exploded picture.

The 130Nm figure can only apply to the M28x1.5 steel (I think as I haven’t removed mine) top nut that screws into the top of the steel stem that holds the whole handle bar cum top fork bracket onto the bike. So it serves a key purpose and should be well attached.

Part 5 into part 1.

Nothing at all to do with the top and bottom stem bearings that are only tightened enough to settle the bearings, as mentioned above. Haynes manual explains in full.

And we all know that any screw into alloy should only be finger tight plus a little

IMG_4674.jpeg - Bild entfernt (keine Rechte)

Preload on the steering head bearings is applied by no. 8 in the diagram. No. 5 goes into no. 1.

Frank

I found a pirated copy of the 2016 model year RS BMW factory service/repair manual on my backup laptop. Here is what it says about adjusting the steering-head bearing: Bottom slotted nut, M35 x 1; Tightening torque 40 Nm; Swing the forks 3x to left/right through full arc of travel; slacken (forks tuned fully to the left), 80 degrees; Tightening torque (forks turned fully to right), 15 Nm; top slotted nut, M35 x 1, secure with circlip. Tightening torque 1 Nm; turn further until circlip can be installed. Note: Make sure that the slots of slotted nuts (upper and lower) are aligned. Install retaining washer (#7 on the diagram above).

Have fun!

Ok.
Having tightened to 50Nm and marked the spot, I go on one week trip to the Alps where it starts to loosen.
I manage to find a 12mm Allen key in France - very tricky indeed - up to 10mm dead easy.
I tighten it using a ring spanner for extra torque.
Anyways, when I returned, I torqued it up to 120Nm and I'd say that was about 10 degrees more turn than 50Nm.
The problem was exacerbated by a long standing shuddering under low speed heavy braking. Not normally a problem in the flat lands of Essex, but a much bigger issue in Alpine switch back descents.
So will get head bearings and discs looked at by my man ASAP.
As an aside, my (first ever set of) Rear Roadsmart 4 was toast after 4000 miles, but I was very heavy handed with the throttle, so can't condemn them on that basis.
Two very friendly French bikers helped me get a new Roadtec 02 fitted to the bike in Colmar.
At £170 (fitted!), cheaper than I can buy them on the internet in UK. I did not get their names and they went about 30 miles out of their way to help. I thanked them with an embrace and told them they had literally saved my live (and holiday enjoyment)
So Vive La France and vive le biking!

Zitat von Duckbubbles im Beitrag #10

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Preload on the steering head bearings is applied by no. 8 in the diagram. No. 5 goes into no. 1.

Frank

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