SpitfireS

This afternoon I took some measurements.
From point A to B turned out to be 96,2 mm.
Rod is round 4 mm.
One may debate about taking that measurement in that way, but I am confident it is accurate within +- 0,2 mm.
Bearing D is 67 mm, half of that (center) is 33,5 mm.
That makes 96,2 - 4 = 92,2 and 92,2 + 33,5 = 125,7 mm from B to center of D.
The pinion gear head is 36,2 mm.
The bearing that goes in to B is 33 mm high.
So without any shims I get a checking distance of : 125,7 - 36,2 - 33 = 56,5 mm.
The checking distance should be 2,132" = 54,15 mm.
The difference is 56,5 - 54,15 = 2,35 mm.
The thinnest shim available form Honda = 3,08 mm.
With that thinnest shim the checking distance becomes 56,2 - 3,08 = 53,12 mm.

I think I'm going to run into a problem.
What do you guys think?

As far as I understand the backlash is set by moving the ring wheel bolted onto Torsen part #3 sideways by turning the 2 nuts #5 that hold the 2 bearings #30 in the 2 caps #4 in pic underneath.
Is that correct?
I am not planning to do this install myself, I'm just doing a pre-study for fun and confidence. I am going to be present when its going to be installed.

S2oooNvegas

what gearset?

thats some pretty nice math. bottom line is, when a trained tech installs it, and the contact is right, theres no telling what thickness of shim youll actually end up with.
IF you are running a richmond, say the new 4.57r i suggest setting up the tooth contact as shown in the richmond install procedure. the tooth contact pics are alot more realistic, (49 series) and you wont be scared half to death like you would be, if you tried to simulate a honda manual's patterns. and it should be nice and quiet when its done.

SpitfireS

Yes, it's a Richmond 4,57-R gearset.

I'm thinking that the checking distance is important to get that tooth contact.
Richmond produced the set and put those numbers on for a reason.
Each set is pre-run on a gear test machine.
The dealer who is doing the install recommended buying the Honda 27 piece shimset.
I'm getting worried I'm not using any of them and wasting $$$.
I would be able to machine a shim myself at work.

Stratocaster

SpitfireS

The stock shim (already installed in the OEM diff) and smaller are your best bet. Buyin the whole set is a waste. I know, I own more then one set. I think the OEM shim is .124 if I remember correctly.

SpitfireS

Stratocaster,
In the service manual MY00-03 they say the "standard" shim is #N = 3.47 mm (0.1366")
Does that sound familiar?
Until the diff is open I will not know for sure what is in there.

And furter, would you agree with the way I measured it?
I have been reading posts about people in need of thinner then OEM kit shims and machining their own as I remember correctly.
That would be supportive with my findings.
The service manual shows no way to measure pinion depth (= checking distance).
I dont know if that number is supplyed with an OEM gear set.
The SM "just" wants you to check tooth contact & backlash and adjust (shim or move side to side) if needed.

Anyway.. thanks for replying.

SpitfireS

Latest news is I'm going to do the install myself at work.
Netx week mon-tue. I will be at work just not clocked
Boss said
This weekend the diff will be dropped according to xvipers pics
We have all the tools present (or are able to make them).
All new bearings, seals, clips, etc.
I do have a service manual.
I'm doing a more precize measurement tomorrow to come up with a "good" shim thicknes.
Thats going to be my starting point.
I do have an extra seal and crushring.
I will take / post pictures.

Stratocaster

Start with the shim used on the OEM set. Then go thiner from there if needed. The Older 4.57 gears required shim that were thinner then the thinnest OEM shim. This batch take OEM shims, and is on the thinner side of the range in the OEM shim kit.

You can build the diff without the crush sleave in place. This way you can set pinion depth and get a good contact patch. Once you are happy with the pinion depth and shim selection, disassemble the diff and install the crush sleave, then set back lash. The backlash settings for this gear set is .10-.080 Too tight and it will generate too much heat.

S2oooNvegas

so your who builds them for ricks?
questions i do have. why such a high lash spec? looking at all the numbers, both honda and richmond, .003-.005 has been right on the money. i havent had any issues yet. and have built 4 so far. seeing how you build tons, id like to hear from you. also, people need to have the proper tools for this, such as a push pull gauge.

[QUOTE]Latest news is I'm going to do the install myself at work.
Netx week mon-tue. I will be at work just not clocked
Boss said
This weekend the diff will be dropped according to xvipers pics

Stratocaster

I don't do the builds, I have someone that has 20 years under his belt. The installation tips are his. I have watched him do them atleast 10 times now, most of the time he builds them when I am not there.

As for the spec, that is what came directly from Richmond.

SpitfireS

From the center of the Torsen bearings to the bottom face of the main pinion bearing turned out to be 92,025 mm.
In the first post I made a mistake, the Torsen bearings are 68 mm, NOT 67 mm!
The gears of the pinion itself is 36,22 mm high.
The main pinion bearing #32307C is 32,75 mm high according to NTN spec.
That bearing has a dynamic load capacity of 93.000 newton! and may run at 6400 rpm when it is oil lubricated.
Nice numbers.

Add and substrart in the right order and you'll find a shim of 2,90 mm.
Its a little closer to OEM thinnest shim, but not quite.

Next post will be about the pinion in the housing and confirming the checking distance.