LD200 pinion depth jig dimension

[Sutherland70]

I see in the hewland manual the reference for the SK681 setting jig, or the alternative style listed on Primus. It appears both are a means to reference the carrier centreline to some known fixed dimension from which to measure the gap "Y" on diagram to set pinion depth.

In the diagram posted below, does anyone know what the dimension I have drawn on, labelled "Z" would be?

Long story short, changing ring/pinion and won't have time to get the setting jig delivered, but have access to machine shop and considering making our own fixture to reference off of carrier centreline.

[kea]

As seen on your drawing, there is hole in the center of the Hewland Jig. Finding that center point is difficult.
But, that said, I get 2.371" as I measure it.

[Sutherland70]

As seen on your drawing, there is hole in the center of the Hewland Jig. Finding that center point is difficult.
But, that said, I get 2.371" as I measure it.

Thank you Keith, I appreciate that. That is measuring from the hewland style tool shown in the manual?

It looks like everything works off that baseline for set up so I guess the Primus tool must work in some way similar.

[kea]

Yes, this is a Hewland tool.
Now, the question is, is the hole in the tool really the center and/or does it matter ?

[Speed Sport Engineering]

Yes, this is a Hewland tool.
Now, the question is, is the hole in the tool really the center and/or does it matter ?

When you purchase a new CWP from Hewland, the tag they send with it should have the gauge diameter (Z) listed that was used to measure the desired gap (Y).

The actual diameter of the fixture isn't critical as long as you adjust the Y dimension for the difference in your gauge diameter vs the gauge diameter on the supplied tag.

We made a fixture, set everything to the numbers on the tag, and checked the pinion depth by marking and running a pattern and it was perfect the first try. The hardest part of the process was getting the backlash correct.

[scotty82]

Z will be 2.355. Exact same as a MK

You can make a fixture out of a single chunk of aluminum.
2.355 on the big end , 1.716 on the small end to fit into the right side of the case with the diff bearing cup removed
Total height of the fixture is around 2.00 tall.
Only use the tag as a starting point . Running patterns is the only way you will get a correct set up,
We usually will run 3 to 4 patterns on set up bearings and final bearings
These patterns must be done under a load
Give me a call if you have any questions Stephen