Changing coil spring

vaio

I'd have thought the nut would tighten against a shoulder so measuring would be a waste of time.

With that type of piston rod I'd either use an impact gun with a standard socket or use a ratchet & socket and use a stillsons on the rod to stop it turning.

Get the stillsons up nice & high so the inevitable surface marks are in an area that doesn't go as low as the shock seals

Wig

I was wondering the same, but not wanting to damage the piston surface. and I'm not sure a stillsons could hold up on a shiny polished surface against 60 lbft.

molerat

Wig wrote: »

My other thought is an engineering question:
I wonder how accurate a crows foot torque is compared with a directly applied torque? Do you think they take into consideration that it will be applied with a crows foot when they set the torque value?

So for example if a direct torque is 100 Lbft
How much would a crows foot torque have to be applied to reach the same direct torque? Would it be more or less? It would surely be less because of the extra distance and Bending Moment principle. But I can't work out if there is an error developed by the way the turning moment is being applied to the side rather than from above

http://www.engineersedge.com/manufacturing_spec/torque_wrench_1.htm
Alternatively use the crows foot at 90deg to the torque wrench and it will make negligible difference to the torque applied.

Wig

molerat wrote: »

http://www.engineersedge.com/manufacturing_spec/torque_wrench_1.htm
Alternatively use the crows foot at 90deg to the torque wrench and it will make negligible difference to the torque applied.

But by doing that are you not losing a lot of the energy by pressing against an immovable object (the bolt)?

If you have the crow foot extending off the tip of the wrench there is nothing to the south of the wrench to stop you turning the wrench.

If you have it at 90° then the bolt is to the south of the wrench and will absorb a lot of the energy....surely?


Thanks for the link just what I needed.

Limey

Wig wrote: »

I was wondering the same, but not wanting to damage the piston surface. and I'm not sure a stillsons could hold up on a shiny polished surface against 60 lbft.

With suspension top nuts I've found the best time to torque them up is when the car is back on it's wheels, the weight prevents the shock absorber piston from rotating.