Hi,am changing rear sprocket and chain and have downloaded the bmw service manual and looking at it,the rear sprocket nuts have to be tightened to 110Nm and replaced. My questions are can someone confirm the torque value and is it really necessary to replace the nuts?
Rear sprocket nuts
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That's what I thought. Looking in the service manual all I can see is "chain sprocket to sprocket carrier" 110nm. It mentions tightening them diagonally and replacing as they have a mechanical lock feature. Just taken original ones off and did so with relative ease using a spanner.
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Its defo 110nm and to replace the nuts according to the BMW service data. Plus the tightening sequence is diagonal.
My understanding of the mechanical lock feature of the nuts is that they will gradually lose the mechanical lock strength after x amount of uses which can result in incorrect tightening, I believe BMW say they need changing every time to cover their arses. I would be changing them when I replace my rear sprocket for piece of mind.
My understanding of the mechanical lock feature of the nuts is that they will gradually lose the mechanical lock strength after x amount of uses which can result in incorrect tightening, I believe BMW say they need changing every time to cover their arses. I would be changing them when I replace my rear sprocket for piece of mind.
fast_ryan
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Rear Sprocket
I had to check this with BMW before I obtained a Service & Repair Manual. They stated that the torque setting for the rear sprocket to carrier on the HP Forged Wheels was 70 Nm then an additional 90? degree turn.
I had to check this with BMW before I obtained a Service & Repair Manual. They stated that the torque setting for the rear sprocket to carrier on the HP Forged Wheels was 70 Nm then an additional 90? degree turn.
mids rich
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Mick753
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The torque rating for Titanium will be different too, much the same as any torque rating will change if you add any form of grease or threadlock to a bolt that doesn't normally have it regardless of what the manual states.
Seen it plenty of times where people have changed bolts and not taking into account what the bolts are made of and then over tightened them by using the manufacturers torque setting on bolts that have a lower tensile rating
Seen it plenty of times where people have changed bolts and not taking into account what the bolts are made of and then over tightened them by using the manufacturers torque setting on bolts that have a lower tensile rating
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Thats the spec for forged wheels - thanks for pointing that out Ryan, had never considered they would be different.
fast_ryan
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How much are the pro bolts ones?
?32.50 + postage. That's without forum discount deducted tho.
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