Tightening torques - Initial/Final???

[GSmonkey]

Looking at the workshop instructions for refitting the oil drain plug on the 1200GS. It says Initial Torque 23Nm + Final Torque 32Nm. What is the difference between the two figures??

 

[Possu]

9nm?

 

[MasterDabber]

Normally initial torque settings are given when tightening more than one bolt...
an example would be when fixing a flange which has multiple bolts securing it.
It's quite common for an initial torque setting to be given so that you'd go round and tighten each of the bolts at, for example, 80% of the final setting.
You'd then go around again and tighten them to the final torque setting...

Not sure how this applies to a single bolt like the drain plug though.
Guess it means tighten it to 23 nm and then go tighten it again to 32nm.

 

[MikeP]

Is the difference with and without a new crush washer?

 

[GSmonkey]

Guess it means tighten it to 23 nm and then go tighten it again to 32nm.

....that was my conclusion, but it seems a bit daft, why not just tighten to 32Nm straight away??

 

[Timolgra]

More like tighten to 23nm cold - 32nm when hot, (ie later)

 

[Mouse]

I've done three oil changes on my bike so far, I just tightened the bolt to 32Nm. No problems.

 

[GSmonkey]

Cheers mouse - sounds like a plan.

 

[carbold]

It sounds like what you do with new spark plugs to flatten the washer: torque first to a certain value, then untighten then torque again to the final value...

 

[John Armstrong]

It sounds like what you do with new spark plugs to flatten the washer: torque first to a certain value, then untighten then torque again to the final value...

If your talking about the same thing as bearing pre-loading then the initial torque is higher than the final?

 

[Gecko]

I've done three oil changes on my bike so far, I just tightened the bolt to 32Nm. No problems.

Yeah but now you've invalidated your warranty