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Cylinder head studs-Ford 9N

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PostPosted: Tue Mar 31, 2020 6:36 pm    Post subject: Cylinder head studs-Ford 9N Reply to specific post Reply with quote

Anyone out there have a couple good used cylinder head studs and nuts. Most of mine are good but could use a few.
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PostPosted: Tue Mar 31, 2020 7:08 pm    Post subject: Re: Cylinder head studs-Ford 9N Reply to specific post Reply with quote

i should have several, some with nuts comfortably fused to the stud, and some that came off. i'll have a look to see what kind of shape they're in.

not knowing any better at the time, i replaced all of mine when i did my rebuild.
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Tim PloughNman Daley
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PostPosted: Wed Apr 01, 2020 4:27 am    Post subject: Re: Cylinder head studs-Ford 9N Reply to specific post Reply with quote

Everyone seems to be going with head bolts these days. Here's a 7/16-14 x 7/16-20 x 3.00 stud, Grade 8, from SUMMIT RACING. It was the first place I looked so there may be others; allenfasteners for one. Note length is 3". OEM specifies 3 at 2.9" and 15 at 2.78" so if you must, grind off the 7/16-20 end that accepts the hex nut. Use an old one to compare with. Hex Nuts are 7/16-20 and can be bought new just about everywhere; use Grade 8. New OEM length 7/16 Studs were posted for a source a while back so search the archives for the data. I lost me folder with it on my old PC when it died a few months ago. Studs inserted with coarse end into the cast iron block, fine thread accepts the hex nut fastener. This is one part where it is critical to apply torque using correct values and correct sequence. Hex nuts use a different torque spec than the later hex bolts.

Torque is different for nuts and bolts. The UNC (coarse) end, 7/16-14 always goes into cast iron. The UNF (fine) end, 7/16-20 accepts the hex nut. Be sure you know specs are different for the 7/16 hex nuts than the 7/16-14 hex bolts and how to set the value in the correct scale. The chart lists values in Foot-Pounds. Torque wrenches can have scales in one, two, or all of these: Inch-Ounces, Inch-Pounds, Foot-Pounds, Meter-Kilograms, or Newton-Meters. Your wrench should have an instruction sheet with the conversion formulas on it for all. Know the proper use of a torque wrench and the correct method to torque a fastener -in three steps. Take the nominal finish spec, we'll use 54 Ft/Lbs in this example. 54/3=18. Set scale to 18 Ft/Lbs for the first pass and follow torque sequence from chart. For the 2nd pass set the wrench scale to 36 Ft/Lbs and repeat sequence. For the 3rd and final sequence pass, the scale is set to 54 Ft/Lbs. NEVER use a torque wrench to loosen a fastener with -it'll ruin the lead screw and give inaccurate readings. Always loosen the locking ring when making an adjustment. Always turn the thimble back a few revolutions and slowly advance towards the main scale setting number you wish in order to keep the backlash out. Always be sure to lock the ring once setting is reached. If wrench is not to be used in a long while, loosen the locking ring and turn thimble back to the lowest setting and keep well lubed.


Tim Daley(MI)
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PostPosted: Sat Apr 04, 2020 7:29 am    Post subject: Re: Cylinder head studs-Ford 9N Reply to specific post Reply with quote

You can still get the original type studs and nuts from some of the car & truck parts suppliers. Google the Ford tractor stud & nut part
numbers. They cross to the car/truck numbers on Mac's Auto Parts site, for instance. Or just search for "Head Studs and Nuts" on this forum
to see my post about 6 months ago. Good luck.

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