Bolt torque specs

[HoosierDaddy]

I unbolted my driveshaft from the trans to make a shifter installation easier (it didn't). Now I need to re-torque the bolts.

Where can I find the torque values for those bolts without buying a service manual which I have no other need for?

Auto-zone provides that stuff for free for cars you own but I found out too late they don't have data on 6th gen Mustangs (yet). And Alldata doesn't have any Ford service info that I could find.

Update: the Service manual does NOT include torque specs for these bolts. It says to remove them for specific situations but never says what to torque them to when reassembling.

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[plc268]

I uploaded a portion of the manual on the driveshaft. Let me know if this helps.

https://drive.google.com/file/d/0B0YMWzYwztZkUFJVNWlCeUNPNzg/view?usp=sharing

 

[HoosierDaddy]

I uploaded a portion of the manual on the driveshaft. Let me know if this helps.

https://drive.google.com/file/d/0B0YMWzYwztZkUFJVNWlCeUNPNzg/view?usp=sharing

I really appreciate that. Unfortunately, it has the info for every $%^# bolt but the ones I loosened. They are the ones pointed to by a red arrow I added:

 

[Optimum Performance]

I really appreciate that. Unfortunately, it has the info for every $%^# bolt but the ones I loosened. They are the ones pointed to by a red arrow I added:

Depending if it is 3 or 4 bolt flange but basically 80ft/lbs if I follow what you are looking for.

 

[HoosierDaddy]

Depending if it is 3 or 4 bolt flange but basically 80ft/lbs if I follow what you are looking for.

Thanks. It's 3 bolt. The page plc268 posted shows 81 or 80 for the larger bolts that are red/purple in the picture I posted depending if its 3 or 4 bolt.

I'm thinking the much smaller bolts I'm talking about would have a different torque but don't have anything that actually says the proper torque. I don't know if they are reusable. The ones shown in red/purple in the Ford manual that list 80 lbs are NOT reusable but the ones I loosened have a nut so maybe they are.

I'm guessing that Ford has absolutely no procedure that requires a dealer tech to remove the bolts I'm talking about so they never bothered to list the specs in the manual.

 

[HoosierDaddy]

Looking at plc268's file, it calls the part the bolts go thru a Flex Coupling. And they say it is a replaceable part so I'm thinking the manual covers that somewhere. Its the bolts/nuts in the picture below I'm talking about. Can someone post the torque values for those bolts and also if they are reusable (I suspect they are)?

 

[Optimum Performance]

All I have

 

[HoosierDaddy]

All I have

Thanks. Maybe someone else has the specs for these bolts.

No reference to flex coupling bolts in what you have? I know some manuals might be all pics and not word searchable.

 

[HoosierDaddy]

Okay. Not sure if the torque specs are in the service manual or not since nobody posted them. If they aren't in the manual, can it be determined from the size and markings on the fasteners?

These are the three bolts that connect the flex coupling to the front of the drive shaft as shown in post #6.

Below are pics of the bolts and nuts.

The bolt heads take a 15mm wrench and the nuts take 18mm.

The bolt head is marked "SFT 10.9". The nuts have a "T" marking on one edge and "1 0" on the opposite side. The end of the bolt has a groove cut in it. I don't see any thread locker, at least not anything with a color but the bolt turns easily until it gets to the last thread in the nut and then it gets very hard to turn, sort of like a nylock nut but its not one, so the last thread in the nut is somehow different than the ones before it.

 

[4orceFed]

Not sure if this is what you're looking for, but under the FRPP short throw shifter for our Mustangs, the install instructions take you to the Ford Manual link. In this install they completely remove the stock drive shaft and provide torque specs

http://www.cjponyparts.com/skin/frontend/cj-pony/default/images/install-pdf/install_m7210m8.pdf

 

[HoosierDaddy]

Not sure if this is what you're looking for, but under the FRPP short throw shifter for our Mustangs, the install instructions take you to the Ford Manual link. In this install they completely remove the stock drive shaft and provide torque specs

http://www.cjponyparts.com/skin/frontend/cj-pony/default/images/install-pdf/install_m7210m8.pdf

Thanks. That doesn't cover the bolts in question but I saved it for possible future needs.

Someone has checked the official Ford service manual and it does NOT include the values for these bolts. It tells techs to replace the coupling the bolts go thru if the coupling is cracked but never say what torque to use.

 

[Bartly]

Thanks. That doesn't cover the bolts in question but I saved it for possible future needs.

Someone has checked the official Ford service manual and it does NOT include the values for these bolts. It tells techs to replace the coupling the bolts go thru if the coupling is cracked but never say what torque to use.

10.9 is the metric bolt grade. Take one of the bolts to a hardware store and find the nut that fits it, that will give you the thread size and pitch. With that info there are plenty of charts on the internet that will tell you what the bolt torque should be. Sorry I don't have the info or I'd give it to you.

 

[HoosierDaddy]

10.9 is the metric bolt grade. Take one of the bolts to a hardware store and find the nut that fits it, that will give you the thread size and pitch. With that info there are plenty of charts on the internet that will tell you what the bolt torque should be. Sorry I don't have the info or I'd give it to you.

I have the nuts that the bolts thread into. They take an 18mm socket.

I've looked up torque ratings but can't seem to find exactly what they are because all the charts I find are based on bolt diameter rather than head size and they don't include the diameter of these (or any 18mm head) fasteners.

An M10 (10mm diameter) lists a diameter of .3937 inches (10mm duh) and a typical nut wrench size of 17mm. As I said, these bolts use an 18mm nut and the bolts take a 15mm wrench but the diameter of the bolt is actually less than 10mm. So either very weird fasteners OR I don't know how to interpret the charts.

Charts say an M10 10.9 grade bolt would take 40 ft.lbs.

But....

(1) The nuts have some sort of locking mechanism in them. They spin on easily until the last thread of the nut and then they become VERY hard to turn by hand. Its like they were nylock nuts but there is no nylon insert so it has to be some difference in the machining of the last thread to make them not a proper fit. I have not run across this before and don't know what search terms to use to learn about it. And when I removed the nuts, my impression was that it took well over 40 ft.lbs to remove them and possibly due to however that last thread in the nut functions.

(2) The bolt goes thru the "rubber" coupling which may not "want" as much compression force on it as the bolt's maximum torque rating would apply.

 

[Chef jpd]

The nut you have looks like a "conelock' or "prevailing torque locknut"
It has an either wavy or.slight conical shape to grab the bolt.

 

[HoosierDaddy]

The nut you have looks like a "conelock' or "prevailing torque locknut"
It has an either wavy or.slight conical shape to grab the bolt.

Thanks. Will research that to see how it impacts torquing and reuse.

Edit: if its the type it seems to be, it is reusable.

Obviously the torque to overcome the locking is far less than the final torque but I'm not clear if you should determine and add the two together for a torque wrench settings. Since I have no idea if the material of the coupling the bolts go thru lowers the "proper" torque for this application, I'm not going to sweat if just using the bolt torque limit effectively results in that minus the overcoming torque but have an educational interest.

And since the bolts and nuts are reusable and the factory didn't use locktite in addition to the locking nuts, I won't be using locktite either.

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