Chris's new build of an MX5 based car

[CTWV50]

edited........

[CTWV50]

OMG I hope XCweather is wrong!



In other news a glued a bit of trim back on that had become detached. And I torqued all the diff ring gear bolts to 80nm with loctite.

edit: At best heavy rain and wind here and at test station, at worst heavy snow and wind. Bollocks to that, I've just phone the IVA station and got my date moved to the 17th March.

[flyerncle]

Noted .

[CTWV50]

Finally got all the bits needed to rebuild the diff. I was waiting on a new crush tube and nylock nut from the local mazda dealer, parts kid there is useless but fortunately my good friend works there and sorted out the correct parts for me. I did attempt to reuse the old crush tube by compressing it in a vice and I did lengthen it by 0.5mm which would probably been ok but as it was only £10 and available I got a replacement.


So last night I set about reinstalling the pinion shaft with the new seal. You have to torque up the nylock nut until it starts to actually crush down on the crush tube, unsurprisingly. I made a diff nose holder out of some left over 50mmx3mm angle and some bolts and set to work.



continued......

[CTWV50]

Because I was reusing the the old bearings I had to put plenty of effort in to crush down the new tube being careful not to go too far by doing 1/8th of an inch turns and then checking the drag torque.



10 inch lbs was enough for me on used bearings, the guy in this thread did 12 in/lbs on new bearings but 10-15 in/lbs is within a general range apparently.

http://forum.miata.net/vb/archive/in.../t-171048.html



Job done!

Next the actual LSD install.

[Stot]

Was there a reason you pulled the pinion out? If you leave it in and just swap the ring gear onto the new diff you don't need to worry about shimming it. You may need to re-shim it now you have that new crush tube in there which will be a right pain getting it all together measuring everything, and if new shims are needed stripping it all back again, new shim, rinse repeat.

Cheers
Stot.

[CTWV50]

Originally Posted by Stot

Was there a reason you pulled the pinion out? If you leave it in and just swap the ring gear onto the new diff you don't need to worry about shimming it. You may need to re-shim it now you have that new crush tube in there which will be a right pain getting it all together measuring everything, and if new shims are needed stripping it all back again, new shim, rinse repeat.

Cheers
Stot.

I've actually just finished putting it all back together, I'll post pictures later. I wanted to replace the pinion seal and do a complete strip down and rebuild. There's is no need to shim, the mx5 diff uses a crush tube instead of shims. Fortunately the pinion bearings were fine so I was just able to rebuild without replacing them. I only replaced the diff side bearings because I thought it would be too much effort to get the old ones off.

Pictures later.