i'm a bit confused about correctly torquing up airhead driveshaft bolts...
there's a bmw crowsfoot type tool 33.1.620 that enables a torque wrench to be applied to the awkward to get at bolt heads. this is either it, or it looks like it:
i can easily knock something up like that, but what i need to know is, the distance between centres of the 3/8 drive and the 10mm 12 pt.
looks like 1 1/4" or 45 mm in the pic to me. can anyone who's got one confirm?
secondly, having looked at several bits of reference material, i am still unsure of the torque setting. is it:
1) a true 40Nm applied to the bolt head, ie. 40Nm minus a correction factor to allow for the tool extension?
this is what the snowbum site seems to imply.
or
2) 40Nm being the figure applied to the drive end of the factory tool?
what haynes and probably bmw suggest.
or
3) a decent bit of welly, gauged manually, applied to the bolt head via my trusty snap~on 10mm combination wrench?
what it will actually get if i don't get an answer here
there's a bmw crowsfoot type tool 33.1.620 that enables a torque wrench to be applied to the awkward to get at bolt heads. this is either it, or it looks like it:
i can easily knock something up like that, but what i need to know is, the distance between centres of the 3/8 drive and the 10mm 12 pt.
looks like 1 1/4" or 45 mm in the pic to me. can anyone who's got one confirm?
secondly, having looked at several bits of reference material, i am still unsure of the torque setting. is it:
1) a true 40Nm applied to the bolt head, ie. 40Nm minus a correction factor to allow for the tool extension?
this is what the snowbum site seems to imply.
or
2) 40Nm being the figure applied to the drive end of the factory tool?
what haynes and probably bmw suggest.
or
3) a decent bit of welly, gauged manually, applied to the bolt head via my trusty snap~on 10mm combination wrench?
what it will actually get if i don't get an answer here