Pinion Depth Setting Rig without Dial Indicator Included? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 8 (permalink) Old 04-23-2004, 07:13 PM Thread Starter
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Pinion Depth Setting Rig without Dial Indicator Included?

Is there any way to set pinion depth without a depth setting tool? Spendy little buggers . . .

I have a dial indicator for cam degreeing, backlash,etc, but what I'm wondering is if that will work for setting pinion depth, and if anyone makes a jig for it? Or, can you make one yourself?

[ This Message was edited by: 69convert on 4/24/04 8:35am ]

[ This Message was edited by: 69convert on 4/24/04 9:50am ]
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post #2 of 8 (permalink) Old 04-23-2004, 10:33 PM
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Pinion Depth Setting Rig without Dial Indicator Included?

You can use a depth mic if you have it. You have to measure the bearing bore in the case and the cap, find the difference (because the cap boss is not exactly in the middle of the bore) and create a "correction factor". Then measure from the cap boss surface to the back of the pinion, apply the correction factor and then you know where the back of the pinion is in relation to the bearing bore center.

I haven't priced depth mics lately, but I'll bet a good pinion depth tool is about the same or maybe less than a Starret or Brown & Sharpe depth mic set.



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post #3 of 8 (permalink) Old 04-24-2004, 02:44 AM Thread Starter
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Pinion Depth Setting Rig without Dial Indicator Included?

Thanks CKelly, as always. I think you're probably right about the price - I'm guessing the actual measuring part (dial indicator or micrometer) is what drives the cost either way. I'm trying to think of a way to use my existing dial indicator to get at either measure, either by buying a jig to hold it as a regular pinion setting tool, or, now that you've got me thinking, to measure depth. It doesn't seem like the part that holds the gauge is really all that complex, and that there's got to be a way to make one or at least buy the holder part.

For what I'm going to spend on a pinion setting tool I could have someone else set it up, but I'm kind of into the do it myself thing with this car. Not sure it actually saves me money, but it's what makes it the most fun
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post #4 of 8 (permalink) Old 04-24-2004, 08:27 AM
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Pinion Depth Setting Rig without Dial Indicator Included?

Yep - the fun part is worth something! However you hack at it, it's still going to come down to the pattern. When I set up the 4.56's, I did the measure, set the shim pack, got a pattern, then had to call Richmond. I ended up taking about .020 out of the pack to get the pattern. The tech guy said "it's the pattern we want, don't sweat the depth". SO...you may do just as well with a big pack of shims and some pattern goo. That takes some patience. I spent about 4 hours getting a decent pattern.



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post #5 of 8 (permalink) Old 04-24-2004, 09:05 AM
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Pinion Depth Setting Rig without Dial Indicator Included?

I don't think the 9" caps are split in the exact center. I went to great pains on a couple rears to set them up according to the pinion depth printed on the gears, and the pattern ended up WAY off base... like 0.020" or 0.030".

You'll need a special tool that fits in the tightened caps, or just use the trial and error method for these rears.

It all comes down to the pattern. The depth listed on the gear is just an effort from the gear maker to help the technician get a good pattern.

They are indeed a PITA to set up. It takes more patience in getting it right than outright skill. Come up with a beam type or dial type in-lb torque wrench that reads accurately down to around 10 in-lbs, and the pinion preload won't even be much of a problem. New bearings/seals are set to around 20-24, used ones a little less.

TAKE YOUR TIME and get the right pattern.

Good Luck!
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post #6 of 8 (permalink) Old 04-24-2004, 09:28 AM
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Pinion Depth Setting Rig without Dial Indicator Included?

That's correct. You can compensate for that by measuring both the cap and the case part of the bore to find the true centerline. On my case, I have to add .012 to the depth of the pinion (from the cap boss) to get the true distance from the ring gear center line. I have a bunch of high buck inspection tools from my days as a mechanical QC inspector, so that helps me quite a bit. I'd still like to get a real depth checker. Less hassle.

The kits from Randy's Ring and Pinion come with good instructions and the Richmond sheet packed with the gears is pretty good too.



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post #7 of 8 (permalink) Old 04-24-2004, 12:28 PM Thread Starter
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Pinion Depth Setting Rig without Dial Indicator Included?

Quote:
On 2004-04-24 09:28, ckelly wrote:
That's correct. You can compensate for that by measuring both the cap and the case part of the bore to find the true centerline.
Thanks guys. That's a really good point - I hadn't thought of that, comparing the two halves and compensating for the difference. I think I've found my solution!
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post #8 of 8 (permalink) Old 04-24-2004, 01:38 PM
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Pinion Depth Setting Rig without Dial Indicator Included?

Pattern and bearing preload. Pinion preload is measured by a inch # torque wrench. I use solid sleeve and not the "crush" ones. Pinion and then total preload assembled.
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