How to Use a Jegs Pinion Depth Tool

How to Use a Jegs Pinion Depth Tool

A Jegs Universal Pinion Depth Setting Tool may used to measure the exact pinion depth of automotive differential components. A Jegs pinion depth tool is similar in design to pinion depth measuring tools produced by other manufacturers, and is used in the same fashion. virtual reality headset Measurements are taken by attaching the tool to the machined bearing cap (mating surface) in the differential housing (with supplied clamps), then checking the measured distance to the pinion gear. Learning to use this tool is easy, but requires a bit of practice to become proficient.


Inspect the pinion gear exterior to locate the proper dimension of the gear this dimension is usually etched on the surface of the gear. The dimension represents the required distance (target depth) from the bearing center line to the rear face of the pinion gear. Record this dimension. (It might look like 1.201, for example.)


Zero out the dial indicator (on the pinion depth tool) using the calibrating tube that came supplied with the tool. Loosen the collet (neck screw), then place the extension tube inside the calibrating tube. Slide the dial indicator slowly into the collet region, until the gauge needle reads "0," then re tighten the collet. Be careful not to move anything when tightening the collet. This calibration step (similar to calibrating a scale) is important since it adjusts the tool so that the measured distance is the distance displayed on the tool, with no tool error present.