How To Install Front Nismo Diff ?

[cobrAA]

My mechanic is having trouble figuring out where to trim the diff. The problem is the diff will fit int he case but it wont spin, it lock when the diff is in position so it must not make the good contact but he can't figure where it was to be removed because it's not knocking anywhere.

I found these information on the net but it doesn't seems to help me much.. can someone shed some light please ? and/or translate the instruction from nismo in japanese ?

I'm willing to pay for the information, we really need to get that pan installed so we can proceed with the rebuild.

Thanks !

http://www.gtrpwr.com/showthread.php?t=6675

[Ben C34]

As in the gears are meshing way too tight and won't turn?

All diff either use shims or threaded adjusters to set pinion depth and pattern.

It shouldnt be that confusing.

Maybe this will help a bit. It shows the shim under the side bearing races etc.

http://www.gtrpwr.com/showthread.php?t=6675

Haha. I linked to your link. Too early for me.....

So it binds up when fully assembled? Is he experienced building diffs ?

[Ben C34]

And that link you posted even shows where in the case that needs to be cleared.

Did he do that?

[cobrAA]

what confuse him is that it appears the diff is not ''grinding/touching'' any of my housing ( like if my housing already had the material grinding before..) so he was like '' cool, bolt-on affair! '' but then when we started turning it, it would turn 3/4 and then jam.

[MJTru]

What i do is an old school method but may work mate. I paint all the gears turn them and then remove all the gears to inspect the wear or contact pattern. I do that first with the original unit then compare it to what im looking for with the new one. It should be the shim method. This is the rear diff right. ??

Edited July 15, 2015 by MJTru

[iruvyouskyrine]

What i do is an old school method but may work mate. I paint all the gears turn them and then remove all the gears to inspect the wear or contact pattern. I do that first with the original unit then compare it to what im looking for with the new one. It should be the shim method. This is the rear diff right. ??

Title of the thread says its front diff.

[MJTru]

Opps missed that

[MJTru]

Ahh. Method i use would still be applicable

[GTSBoy]

CobrAA, there's another thread with the video you need to see linked in it.

[Sick_R31]

HarrisRacing's build thread has pictures on where to grind material off the sump http://www.sau.com.au/forums/topic/447384-r32-gtr-build-in-usa/?p=7559306

[Ben C34]

HarrisRacing's build thread has pictures on where to grind material off the sump http://www.sau.com.au/forums/topic/447384-r32-gtr-build-in-usa/?p=7559306

Which is shown in the original post link.

Seriously.

[Ben C34]

Its pretty wierd to ask for help, link a thread and then say you didn't do what that thread said, which was the actual installation instructions for what you are installing.

[cobrAA]

we got it working. I'm sorry if it sounded weird.. I'm also not a huge fan when the mechanic ask me for help fitting something.. I mean, I'm not the expert.. oh well. its now working. Seems like he didn't grind enough material the first time.

[HarrisRacing]

Yes there are 5 places to grind.

4 of them allow the diff to be installed. (Mine simply would NOT go without these ground clear).

The 5th place needs to be relieved so the LSD can rotate. It is the boss for the bolt threads next to the oil pan side. I didn't grind this one enough in the pictures below and the next group of pictures didn't come out clear after I ground it later...but had the same exact issue your mechanic had. You'll see some marking and grinding in the pictures below...the bolt boss wasn't ground enough and the wider diameter of the new LSD wouldn't clear in 4 places of rotation. When you fit it, you can easily see clearance issue (as your mechanic did).

What...you don't have a japanese mechanic? The instructions were very clear (if you know Japanese!)

Make sure he gets his shims and preload right! The preload on this front diff is so low it's laughable (AND HARD TO GET RIGHT).

Edited July 22, 2015 by HarrisRacing