Has anyone made up a torque table for the Model A?
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Regards - Neil Wilson - [email protected] -
Brattons has one in their catalogue, and I am fairly sure Mitch has re-posted that here in the technical area, with some refinements. For example the spec for the camshaft is way over what the cam gear makers suggest
here it is
https://www.vintagefordforum.com/for...-w-correctionsLast edited by tbirdtbird; 11-16-2017, 09:30 AM. -
As Ford never had torque specs, any table would be just a guess based on bolt size like the Les Andrews books have in it. Some values would be too much for the intended use.Comment
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Just tighten until tight. Ford did not use torque wrenches, but had a different wrench for each application, and the handle was designed to provide the correct tightness. That is why the rod nuts are 21/32. Only the rod nut wrench would fit that job. Common sense is the best guide. Anybody with any mechanical experience knows how tight a bolt or nut should be.Comment
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In reassembling the cam shaft the Les Andrews books say put on nut and tighten. No mention of torque. In 2 parts suppliers catalogs they say this nut should be torqued to 100 lbs. Is this torque number correct and how do you torque this strange shaped nut? I can only see a open ended wrench fitting on this nut....03-18-2022, 06:00 PM -
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I interesting chart I ran across again. Kinda explains why I shift when i do.
...03-30-2019, 10:33 PM -
I was asked in a PM about my recommendation of 25-30 ft lbs of torque on the manifold nuts, and where did that number come from.
I think this is important enough to get into the open forum, as it can spare someone a cracked manifold. I was also asked my qualifications. I believe the Andrews book suggests 55.
My reply follows.
I have been an engine builder for over 40 years,...11-15-2018, 10:10 PM -
100 foot lbs. puts me in between cotter pins holes. Do I take it on up or back off to align pin holes with slot in the nut?10-26-2018, 12:04 PM -
Les' book says 20 ft. Pounds. Is that correct. Seems a little heavy for such small bolts....12-02-2017, 11:23 AM
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From time to time a discussion of Henry not having torque specs arises.
At some later point, engineers derived torque values based on the diameter and grade of the bolts/nuts.
While the current grading system was not in use in Henry's day, IMO his fasteners were at least grade 5. Else, we would not be able to re-use so many bolts, think of the FW mounting bolts and the FW housing...10-25-2018, 09:28 PM -
Les Andrews in his Model A Mechanics publication states that the bolts should be tourqued to 20 ft lbs. In the Brattons Parts Catalogue it states 5 or 6 ft lbs. Any thoughts?07-21-2018, 04:36 PM -
Just a useless tidbit.
There is often discussion that Ford did not use torque wrenches.
I just stumbled onto an assembly line video of '36 Chebbies that showed the workers using what appeared to be a torque limiting wrench, almost similar to today's clicker type wrenches. It looked like when the worker got to the specified torque there was like a clutch that released and the wrench would...02-27-2019, 09:30 PM -
How did Ford determine how tight a fastener should be before the torque wrench was invented?07-05-2020, 05:25 PM
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