The Ford Barn

Joe K · 09-24-2013, 07:57 PM

If you look at a modern "torque spec" chart for SAE bolts, you'll find that 150ft-lbs is fairly low for that size fitting. Like Grade 5 low (3 marks)

See http://www.engineersedge.com/torque_table_sae_ftlbs.htm

Keep in mind that lubrication has a BIG influence in how much torque is translated into tension in the bolt. And it is tension that you want.

I usually lubricate pretty well with a high pressure lubricant - like STP - and torque on the lower side for it's size.

I was instructing someone on a field expedient technique to "turn down" a defective axle thread and re-threading to the next smaller size. I recommended good lubricant and I think about 90 ft-lbs.

Previous discussion (and opine) on rear axle nut torque is at http://www.fordbarn.com/forum/showthread.php?t=74921

Joe K

George D · 09-24-2013, 09:37 PM

Shims are not a fix for worn hubs and axles. A little valve lapping compound and some elbow grease go a longway in helping to fit these parts togather. They will stay tight when fit right. After lapping hubs to axle shims would be fine but only if needed.

09-24-2013, 07:57 PM	#21
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: Rear Axle brake drum hub Shim sleeve ? If you look at a modern "torque spec" chart for SAE bolts, you'll find that 150ft-lbs is fairly low for that size fitting. Like Grade 5 low (3 marks) See http://www.engineersedge.com/torque_table_sae_ftlbs.htm Keep in mind that lubrication has a BIG influence in how much torque is translated into tension in the bolt. And it is tension that you want. I usually lubricate pretty well with a high pressure lubricant - like STP - and torque on the lower side for it's size. I was instructing someone on a field expedient technique to "turn down" a defective axle thread and re-threading to the next smaller size. I recommended good lubricant and I think about 90 ft-lbs. Previous discussion (and opine) on rear axle nut torque is at http://www.fordbarn.com/forum/showthread.php?t=74921 Joe K __________________ Shudda kept the horse.

09-24-2013, 09:37 PM	#22
George D Member Join Date: Dec 2012 Location: Little Falls NY Posts: 67	Re: Rear Axle brake drum hub Shim sleeve ? Shims are not a fix for worn hubs and axles. A little valve lapping compound and some elbow grease go a longway in helping to fit these parts togather. They will stay tight when fit right. After lapping hubs to axle shims would be fine but only if needed.