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Pro Form Pinion Depth Set Up Tool
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Page 2
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- Using the same method as above and in the bearing bore, take a series of measurements to the
top of the pinon head, rotating the pinion for each
measurement. Once you feel you have a consistent
measurement, take the travel of the dial indicator and subtract it from 3". Record this measurement.
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- After removing the pinion we will take our final measurement which is of the pinion head and shim.
Do this with the dial caliper. Take a few
measurements (at different points) and record the result.
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Measurement of the factory pinion head with shim using a dial caliper.
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- Add the measurements obtained in steps 12 and 13. Then, add or subtract the offset as determined
in setp 9. The result is the pinion depth.
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Illustration of my measurements
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Needle on the dial indicator traveled .487 on the bearing bore measurement. Subtracting this number from 2", the
bearing bore measurement I came up
with was 1.513".
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Dial caliper measurement of the bearing race was 3.062". Dividing that number by two, the result was 1.531".
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The offset, as determined using step 9 above, resulted in an offset of .018" needing to be added to the pinion depth measurement
below.
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The travel of the dial indicator on the pinion depth measurement from the bearing cap mating surface was .473". Subtracting
that number from 3" left a
pinion depth from the bearing cap surface of 2.527".
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The dial caliper measurement of the pinion head and shim was 1.908".
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Adding the three measurements; dial caliper measurement of pinion head and shim of 1.908", pinion depth of 2.527", and the
offset of .018", I was left
with a final pinion depth of 4.553". This measurement is .138" deeper than the factory setting of 4.415".
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Obviously, the measurement that I got when I used the Pro Form tool was very far away from factory specs. This, including the
factor illustrated in the
"Setting Pinion Depth" section make me feel that this tool is fairly useless, except to get a measurement
that can serve as a reference point. Personally, I would
not buy the tool if I had to do this over again. I would use the method of
measuring the stock pinion head and shim, and subtracting from that the measurement of
the new pinion head to find the correct
sized pinion shim to use. Then, after installation, I would used the gear marking compoind to check the wear pattern
carefully
and reshim as needed to get the correct wear pattern.
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Back to Contents
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Pinion and Bearing Removal
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