CALIBRATION

NOTE: Each of the three included calibration tubes is calibrated and sealed for each application.

• Important: Please clean all parts carefully before attempting calibration. Any dirt will prevent proper calibration.
• Insert the dial indicator into the cross shaft, with the dial indicator on the rounded side of the shaft and the tip through the flat area on the other side. Tighten the set screw, making sure not to overtighten.R
• Remove the indicator extension stored in the appropriate calibration tube and screw the tip of the extension into the dial indicator until snug.H
• Hold the Cross Shaft and indicator assembly with the tip of the indicator facing up. Slide the calibration tube onto the tip and allow the tube to rest on the flat area of the cross shaft.T
• The thousandths (long arm) pointer should turn slightly clockwise, pointing roughly straight down, or to the 6 o’clock position. If the pointer is not straight down, loosen the set screw on the cross shaft and raise or lower the indicator until the pointer is straight down with the calibration tube is in place. Tighten the set screw until snug (overtightening can lock the indicator shaft or permanently bend the housing) and make sure the pointer stays straight down.

NOTE: Make sure the short hand (sub-dial) is in the “zero” position.

• Loosen the indicator bezel locking screw and with the calibration tube in place, make final adjustment by rotating the dial face until the zero position is aligned with the pointer. Tighten the indicator bezel locking screw. Your Pinion Depth Checker is now set and calibrated for a depth of exactly3.375 inch (Or 1.900 inches for Ford 9” and 2.500 inches for center differentials). This is the calibration depth.

MEASURING PINION DEPTH

1、 Carefully remove any sharp edges or burrs from the carrier bearing housing and cap to avoid inaccurate or damaged hubs.

2、 Make a note of the pinion depth on the pinion gear. If your pinion does not have a depth number on it, go to the “OEM Gear Applications” Section to find the pinion depth.

3、 Put the pinion in the case with the appropriate bearings and spacers.

4、 Clean the surface of the appropriate target plate and pinion gear, then place the Target Plate on the surface of the pinion.

5、 Select a suitable hubs and lightly oil the bores to prevent galling and carefully insert the Cross Shaft into the hubs. Place this assembly into the enclosure and tighten the main cap bolts to 25 ft.-lbs. See the hub application.

NOTE: The “A” diameter has a machined flat to clear the pinion support in the Ford 9″ rear end. Individual applications may require additional relief. When using the “A” diameter in Dana 60s, the machined flat should be located at 90 degrees to the cap parting line.

6、 Slide the indicator and cross as close as possible to the pinion gear to minimize any overhang of the target plate. Make sure to retract the indicator plunger shaft just enough to clear the target plate to prevent the indicator from bending.

7、 Be sure the Indicator shaft end is on the target plate and note the reading on the dial. Multiply the small counter number by 0.100″ and add the thousandths pointer reading to get your INDICATOR READING. Subtract your INDICATOR READING from the CALIBRATED DEPTH (3.375 for the long calibration tube, 2.500 for the intermediate,1.900 for the short), you will have the measured pinion depth.

Example: If the reading on the indicator were 0.778″ (seven full revolutions plus the reading), subtracting from 3.375 would equal 2.597″. This is the measured pinion depth.

Note: In order to minimize the error，rotate the pinion gear to at least four different positions and average the three most similar readings.

8、 Compare the MEASURED PINION DEPTH to the Pinion Depth number inscribed on the pinion gear or obtained from the OEM Gear Section to determine the amount of shims to be added or removed.