How much torque for a wrist pin bolt, and how much for rod castle nuts?
Thanks!
How much torque?
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WayneJ
Topic author - Posts: 521
- Joined: Sun Jan 06, 2019 8:15 pm
- First Name: Wayne
- Last Name: Jorgensen
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How much torque?
Wayne Jorgensen, Batavia, IL
1915 Runabout
1918 Runabout
1915 Runabout
1918 Runabout
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Allan
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Re: How much torque?
Perhaps more important than the torque applied to the wrist pin bolts is how that torque is applied. The piston/rod assembly needs to be held by the wrist pin when torquing the pin bolt. I have two dummy spiggots which go in each end of the wrist pin, and then the whole is held in a vice while the bolt is tightened. Otherwise you run the real risk of twisting the rod if it is held while the bolt is tightened.
Hope this helps.
Allan from down under.
Hope this helps.
Allan from down under.
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Kerry
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Re: How much torque?
Some who like to use a torque value say 30lbs. I still do it Henry's way of by feel, Also as Allan has posted, hold by wrist pin when tightening the bolt, the pin is hollow so slide onto a phillips screw driver in a vice, also remember that the wrist pin bolt faces the cam shaft when assembling engine.
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Mark Gregush
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Re: How much torque?
I use a piece of rod held in the vice and go by feel also, using an original Ford wrench.
Adding: Forgot because I have not used it yet, I have a piston vice.
Adding: Forgot because I have not used it yet, I have a piston vice.
Last edited by Mark Gregush on Fri Apr 29, 2022 11:17 am, edited 1 time in total.
I know the voices aren't real but damn they have some good ideas! 
1925 Cut down pickup
1948 Ford F2 pickup
1925 Cut down pickup
1948 Ford F2 pickup
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ABoer
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Re: How much torque?
I use this ;
Toon
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Allan
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Re: How much torque?
Just like mine Toon. They hold the pin tightly with no slop at all.
Allan from down under.
Allan from down under.
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RajoRacer
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Re: How much torque?
I also use a piston vice & a rod through the pin. Rod bolt nuts I also hand tighten by feel - I assume if one's intent on utilizing a torque wrench, I believe a grade 5 bolt is 6-8 lbs. per 1/8" - Model T rod bolts are 3/8" so close to 24 foot lbs.