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torque specs.

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Old May 17, 2011 | 09:31 AM
  #1  
gbeach's Avatar
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torque specs.

can I find the torque specs for the belt tensioner bolt and the idler pulley bolt on a 1993 7.3l f250 on this site anywhere.
 
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Old May 17, 2011 | 04:12 PM
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axel 56
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In my book it does not list them . but it does list the torque for the different bolt sizes
1/4 -20 unc 7 lbs
5/16-18 unc 14 lbs
3/8-16 unc 24 lbs
7/16-14 unc 38 lbs
1/2 -13 unc 60 lbs
 
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Old May 17, 2011 | 04:38 PM
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I just snugged mine up tight, It certainly isn't gonna be something like 15 ft/lbs, thats too low for something like the idler pulley. Dunno about the tensioner.
 
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Old May 17, 2011 | 08:55 PM
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Here is a link that may help.


BOLTS AND TORQUE SPECS
 
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Old May 18, 2011 | 04:50 AM
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Those bolts have TORX heads....... so they are in Newton meters...

Typical Dimensional and Torque Specifications of TORX Tools

Since they are Torx 50.........132Nm

1 N m = 8.851 lbf • in


Torque is defined as: The measure of the force applied to produce rotational motion (usually measured in foot-pounds). Torque is determined by multiplying the applied force by the distance from the pivot point to the point where the force is applied.
•In the English system, torque is measured in “foot-pounds” or “inch-pounds”.
•In the Metric system, torque is measured in “Newton-meters”.
•8.851 inch-pounds = 1 Newton-meter
•1 foot-pound = 12 inch-pounds
•16 ounce-inches = 1 inch-pound
•1 Newton = 1 kilogram-meter per second squared
•Torque = Force x Moment Arm
 
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Old May 19, 2011 | 07:06 AM
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plc, I am a little confused, so you multiply 132*8.8 which is 11616 inlbs. that doesn't sound right.
 
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Old May 19, 2011 | 08:01 AM
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From: Charles Town, W bygod Va
Originally Posted by PLC7.3
Those bolts have TORX heads....... so they are in Newton meters...

Typical Dimensional and Torque Specifications of TORX Tools

Since they are Torx 50.........132Nm

1 N m = 8.851 lbf • in


Torque is defined as: The measure of the force applied to produce rotational motion (usually measured in foot-pounds). Torque is determined by multiplying the applied force by the distance from the pivot point to the point where the force is applied.
•In the English system, torque is measured in “foot-pounds” or “inch-pounds”.
•In the Metric system, torque is measured in “Newton-meters”.
•8.851 inch-pounds = 1 Newton-meter
•1 foot-pound = 12 inch-pounds
•16 ounce-inches = 1 inch-pound
•1 Newton = 1 kilogram-meter per second squared
•Torque = Force x Moment Arm
looks to me like that link gives you the max torque that a T50 head bolt can handle, not the reccomended torque for a bolt with that size head.
 
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Old May 19, 2011 | 11:35 AM
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okay, in the 94-99 forum, i found 32 for the belt tensioner bolt and 41 for the idler pulley bolt. can anyone confirm this. I can't find anything on the net and the dealer won't call me back.
 
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Old May 19, 2011 | 11:39 AM
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Guy, all you need to do is tighten the idler one up good. I did this to mine years ago and it has never had problems.
 
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Old May 19, 2011 | 12:07 PM
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From: Charles Town, W bygod Va
Originally Posted by snaponprofile
Guy, all you need to do is tighten the idler one up good. I did this to mine years ago and it has never had problems.
This is true, I've never seen anyone put a torque wrench on anything like that. I know there is a apec for every bolt on the truck but I only torque head bolts, rods, mains... stuff like that. Id just get them about as tight as you can with a standard length 3/8 ratchet.
 
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Old May 19, 2011 | 01:29 PM
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Here is a link to a web page of standard torque values for different size and grades of cap screws:
Steel Bolt Torque Specifications Table - Engineer's Handbook
pick the one that matches your screw size and grade.

This is a good page to bookmark if you often need Torque specs for odd bolts
 
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Old May 20, 2011 | 11:20 AM
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well, finally found it. tsb 95-5-22. both are 40. I know you can just tighten them, but I feel better when I know they are set at what they are suppose to be set at.
 
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Old May 20, 2011 | 01:04 PM
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You can over tighten these by hand. I overtightened my idler pulley by hand just the other day when putting on a new ps pump. My idler seized up and blew to pieces. Coulda been a coincidence but I think it was because I over tightened it.
 
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Old May 20, 2011 | 01:44 PM
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I used to not worry about it, but the way i figure they put the spec there for a reason. I don't need to induce another problem.
 
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