36mm oil filter socket

[PMK]

OK, let me offer up an explanation of how the torque wrench extender works. Refer to this setup I have here.

View attachment 169072

As I'm sure you know torque is force x distance. With my wrench the distance from the handle pivot point to the center of the square drive is 17", or 1.417 ft. The scale shows the force that is applied to the handle multiplied by 1.417 so when the torque reading is, say 70 ft-lbs, the force on the handle is 50 lbs (70/1.417). Now, let's add the extension, which in this case is 6" or .5 ft. If I pull on the handle with 50 lbs force the wrench scale will show 70 ft-lbs but the torque being applied to the nut will be 50 lbs x 1.917 ft, or 96 ft-lbs.

When I torqued the rear axle nut on my RT the spec is 166 ft-lbs, so I needed to pull on the handle with 86.6 lbs force (166 ft-lbs/1.917 ft = 86.6 lbs). Multiply 86.6 by 1.417 ft, the length of the torque wrench, you get 122.7 ft-lbs. That is within the scale of my wrench so by pulling on the handle until the torque reading was 122 I applied 166 ft-lbs torque to the axle nut.

To use an extension to torque a nut beyond what the wrench will do, take the required torque, divide by the total length of the wrench plus extension, then multiply by the wrench length. Remember, when you pull on the torque wrench it is important to hold the handle so that all the force is applied to the pivot point.

Hope this helps.

Yes, this is a good method to reach torque on a wrench not capable of a high enoungh torque range.

Consider though, any error, by human use or improper calibration is multiplied also.

As for, in regards to the handles pivot, not all torque wrenches require that feature. Bending beam style wrenches as shown in the photo do require the pivot in order to accurately bend the beam and indicate the reading.

Click type or dial type torque wrenchs do not have pivot handles and they are not required.

Also, if anyone needs to do the correct torque, without owning a torque wrench. Build a wrench. Measure from the center of the socket to where you grip the wrench. 166 lbft is equal to 166 pounds on a 1 foot bar. Or 83 pounds on a two foot bar. Or 55.3 pounds on a three foot bar. Mack Daddy leverage with ease of effort, 41.5 pounds on a four foot bar.

Buy the combination wrench and some strong pipe. Cut the wrench and weld or somehow secure the 1/2 wrench into a known length of pipe. Mark the distance for hand hold and applied the proper amount of pounds. Use a fish scale if needed.

If I did not have the large Snap On torque wrench, I would likely build what I explained above. Done right the one wrench props against the ground while the other is turned.