OBX Assembly queston

[rbryant]

I took my OBX apart and like an idiot failed to keep track of things.

Which center hub gear goes in first the thick one or the thin one or does it matter?

I also had a dowl pin fall out (a big part of why I lost track of things) Is this a special bonus OBX part designed to break things? It didn't seem like it belonged in there and I haven't heard anyone mention it.

The pin is about half an inch long and about the same diameter as the bolts that hold the OBX together.

My washers were stacked as suggested on the list and uncracked. I did notice one particular piece of bad machining.

Hopefully it is ok:

I guess it is slightly blurred but you get the idea
http://rbryant.freeshell.org/obx/OBX%20bad%20machining.jpg

BTW I measured the washers and they are:

1.1" outer diameter (27.94mm) I think up to 1.115 will fit.
.49" center hole (12.446mm) not that this really matters
.05 thick (1.27mm)
.085 height (2.16mm)



These look like good replacements

McMaster part number 96445K278

Precision Metric Belleville Disc Spring Chrome Vanadium,
DIN 2, 14.2mm Id, 28mm Od, 1.5mm Thk, Packs of 12
$5.92 Pack

OR

McMaster part number 96445K273

Precision Metric Belleville Disc Spring High-Carbon Steel,
DIN 1, 14.2mm Id, 28mm Od, 1mm Thk, Packs of 12
$5.29 Pack

One is a bit Thinner, the Other thicker...

Thanks,

Rich

[rbryant]

Oops I found where the dowel pin goes... It is in the reference hole where there isn't a bolt holding the two halves together..

Stupid me.

I put it back together like this:

=axle===Gear=[)()()(]=Gear===axle=

Hopefully that was correct.

I looked at:

=axle===Gear=])()()([=Gear===axle=

but it just didn't seem right.

I had the thick center gear on top but I can't see where it would matter unless the second way is actually the correct one.

My axles fit a little too tight on one side. It appears to be due to the housing being too tight not the splines.

-Rich

[Speedeuphoria]

My axles fit a little too tight on one side. It appears to be due to the housing being too tight not the splines.-Rich

thats how mine is but I had one axle that was sitting around for a year and was not smooth. I haven't tried the new axle yet. It was only on the one side

[turbovanman²]

On one gear, the splines are inside the whole gear, on the other gear, there only half way machined, make sure the splines go towards the axle and the unmachined part goes toward the center. It goes gear, spacer then inside the spacer are the two holders and the washers. That pin goes in a whole in the case and one side rests on the notch thats cutout on one half. Phew, lol.

[rbryant]

On one gear, the splines are inside the whole gear, on the other gear, there only half way machined, make sure the splines go towards the axle and the unmachined part goes toward the center. It goes gear, spacer then inside the spacer are the two holders and the washers. That pin goes in a whole in the case and one side rests on the notch thats cutout on one half. Phew, lol.

Cool I have been doing some research on the spring rates. Some sites suggest that the heavier the spring the harder it will be for it to actually differentiate axle speeds.

In replacing the washer they seem to go up very quickly so perhaps we actually need a 1.25mm washer because the 1mm will be softer than stock and the 1.5mm will be a lot harder like say +50%.

Thanks for the help. I think I got it right. Now I have the problem of my impact gun snapping off a bolt on the ring gear. :(

[rbryant]

It looks like the min order is a couple dozen of these springs to get the correct replacements. Does anyone else want a set? It would be about $15 a set shipped.

They are $2 each in small quantities and $3 should cover the shipping.

If there is enough demand I can order more.

Let me know,

Rich

[turbovanman²]

It looks like the min order is a couple dozen of these springs to get the correct replacements. Does anyone else want a set? It would be about $15 a set shipped.

They are $2 each in small quantities and $3 should cover the shipping.

If there is enough demand I can order more.

Let me know,

Rich

I'll take a set, anyone you know going to SDAC and I can give them the money.

[rbryant]

I also grabbed some from mcmastercar that I plan to stack in and make roughtly the same spring rate.

If a few more people respond I can order the others but it will be $50 or more for the min order so it is hard to justify for 2 people.
28mmX1mm washers tend to have a load of about 1100 N
28mmx1.25mm washers tend to have a load of about 2200 N
28mmx1.5mm washers tend to have a load of about where 2900 N


Essentially I am going to use 10 1mm washers that have a 1.8mm height like this:

(())(())(( This is ~14mm (5 * 1.8mm + 5 * 1mm) and gives a load of 1100 * 2 + 3% = 2266

This costs me $5.29 plus shipping for a bag of 12

instead of the 6 1.5mm washers that have a height of 2.15mm

)()()( This is ~12.9mm and gives a load of 2200

This would cost $2 each

If there is a lot of interest I can check in pricing for 100+ from kellybelleville and that might make more cents...

-Rich

[rbryant]

All,

Here is a description of why the bellville washers are included and a solution!

I found that the belleville washers are only included for when one wheel has very low or zero traction (off the ground, on ice, etc). In these cases the other wheel won't have any traction either because it is a torque biasing diff. Zero times the bias number is still zero.

The washers are therefore used as the LSD in that scenerio by adding pressure between the two axles similar to a phantom grip.

I ordered 8 sets of stock sized replacements.

I will have them mid next week. I can sell them for $15 a set shipped.

I can also get them in 25% stronger for the same price but only have one set on order.

PM me if you want a set.

Thanks,

Rich

[turbovanman²]

All,

Here is a description of why the bellville washers are included and a solution!

I found that the belleville washers are only included for when one wheel has very low or zero traction (off the ground, on ice, etc). In these cases the other wheel won't have any traction either because it is a torque biasing diff. Zero times the bias number is still zero.

The washers are therefore used as the LSD in that scenerio by adding pressure between the two axles similar to a phantom grip.

I ordered 8 sets of stock sized replacements.

I will have them mid next week. I can sell them for $15 a set shipped.

I can also get them in 25% stronger for the same price but only have one set on order.

PM me if you want a set.

Thanks,

Rich


That makes sense, :thumb:

Gonna have to wait on a set, just got back from Hols and totally tapped out, :(