Torquing a nut

[wrr]

I have reassembled the engine and tightened the nut using a socket, Tee bar and mallet. Unfortunately it wasn't enough.
The nut undid and wrecked the key slot in the crankshaft. I've now regenerated the key recess in the shaft and it's ready for flywheel replacement. The flywheel has two large, otherwise unused, axial holes near the periphery and I will try to contrive something to engage with them. I agree the torque figure is high and I'm fearful of strpping the nut thread. I'll use Loctite.
Photos to follow.

If you use a fluid like Loctite, it will act as a lubricant and you should apply less force as the reduction in opposing friction may lead to the bolts shearing.

 

[Graham_Wright]

Could you put a Dyneema or wire rope through one of the holes in the flywheel and attach it to a strong point?


Or put a round steel bar through so that it bears against some part of the cylinder block?

Second idea is the plan.

 

[AntarcticPilot]

Very few crankshaft assembies are pre-loaded - which is what you suggest. A little end float is normally required.
If you weigh 147lbs, that weight at 1 foot from the centre of the nut is 200 NM's. 200NM's is 147 Foot Pounds. It is quite substantial torque setting. For example I recall the torque setting for the Mini steering ball pins. "70lbs feet, after torque is set they should have zero to 3 thou end float, even articulation."

I once used that technique when refitting the hub on a VW camper van! 52mm nut, and I worked out that if I stood on the end of the tommy bar, it's be about right!

 

[rotrax]

With a performance to match?

Some Harley's are very fast. My last big International gig was to take part in the AMA Grand Nationals on the Mile Dirt Track at Springfield, Illinois. August 2005.

I was loaned a proper Mile bike, a 650cc Knight Honda. It weighed under 300lbs, had almost 60 BHP from its fresh engine and it was bloody fast.

But not anywhere near as fast as the several HD XR750cc vee twins. A couple of these, in tarmac racing trim, stuffed our Triumphs and Nortons during the annual Transatlantic Trophy races in the UK during the mid 70's.

First Mate also had, for her Christmas Present in 1995, a 1200cc HD Sportster. After I tweaked it it was far better. As standard it held the record according to the authoratitive 'Cycle World' magazine of having the fastest top gear roll on 50 to 80 MPH of any production motorcycle.

So, not all HD's are big fat 'ole cruisers!

 

[Graham_Wright]

I should have mentioned that the flywheel fits on a tapered shaft.
I found a disc the right size. The two bolts should project far engough and it does not matter if they bend.