S15 diff bolts?

[chandler]

hey guys, I read some where that you need a different mm bolt size to install the diff correctly is this true? it was likea 12 vs a 13 mm bolt. Any truth to this?

[karmakaze]

hey guys, I read some where that you need a different mm bolt size to install the diff correctly is this true? it was likea 12 vs a 13 mm bolt. Any truth to this?

i have heard the same thing. i think that is just the bolts for the ring though.

[naed240sx]

It's kind of true.

Search.

Some people don't worry about it and just torque the bolts down really well. Others get sleeves. Other find the correct size bolts.

[Red coupe]

the OEM S13 R200 ring gear has 12mm bolts, while the helical is a 13mm bolt...So to re-use your original pumkin/ring gear you should find either a spacer for the bolt, or a special bolt.

The bolts are torqued to ~100 foot pounds so some think that the extra play ins't a big deal since its a weak 4 cylinder and there isn't that much torque...

While Ive deffinately read about people doing this, it just sound iffy to me...Nismo makes a set of bolts part#38102-RS500 with 12mm threads and a 13mm shank. The are apparently very hard to come by, but are also required for the Nismo LSD to work in an S13 so I would think they would have to be found somewhere.

If that doesn't pan out I would give a call to ARP and other fastener manufactures and see if they have an equivalant. Just make sure you get bolts strong enough, because IIRC ring gear bolts have some extra hardening done to them...

[chandler]

im going the brass bushing route, I just need to get all of the parts here so I can photo the whole install

[94_240sx]

Nismo makes a set of bolts part#38102-RS500 with 12mm threads and a 13mm shank.

How many bolts do you need when you do the install? I think I'll try to find these 'NISMO' bolts.

[94_240sx]

I think I'll try to find these 'NISMO' bolts.

I sent part inquiry to this place, and Ken from Japanparts just added this bolt #38102-RS500 to their catalog. You can order them from here if you want.

http://www.japanparts.com/db/p...olkey

[94_240sx]

Just got them today. I didn't buy from japanparts.com though. I ordered from someone else. Anyway, I ordered total 11 just in case, but the package has 10 bolts in it. Nismo doesn't sell it separately. I'll work on helical diff soon.

[thenillaz]

What's the downside to getting sleeves? Sounds like a simple run to Home Depot to me...

[Red coupe]

I dunno that there would be much of a downside as long as they fit real well....

But if they were slightly to long the bolts wouldn't torque properly, there may be more play in it (not that it would likely mater when its torqued), metal you use might not be ideal for stress loads or what ever....

Basicly a bunch of whiny stuff you probably don't have to worry about. Sure if you did it well it would be just as good, but having the right part just eleminates the need for jimmy riggen stuff in the first place...and IMO the more you can do proper the better.

Also I don't think its a simple home depo run.... its 12m to 13mm, so you would need a tube with .5 of a mm thickness of the proper of the proper diamiter. When Naed was thinking about using sleeves he was finding the only place to get the right size would be a machine shop.(that not to say its not sitting on SOME hardware shelf...)

How many bolts do you need when you do the install? I think I'll try to find these 'NISMO' bolts.

Damn, I dunno how I missed that...Well good to see your got it sorted, HLSD definatly comes in handy.

[thenillaz]

I see, so it would be less of a hassle to just buy the Nismo bolts, and I think I saw them for like 8 bucks which isnt all that bad. So wait, lemme get this strait, you need the Nismo bolts to properly fit the s13 ring gear on the s15 differential casing? Or do I have it wrong?

[Red coupe]

Well no not to fit the ring gear to the casing...The casing is the cast iron pumpkin.The ring gear is bolted to uhh....what ever you call the actual internals of the diff. Its what holds the ring gear to the actual diff itself.

[thenillaz]

My Chilton's manual refers to the cylinder in which the ring gears bolt onto(the piece I would be buying if I were to get an s15 differential) as the differential case. We are talking about the same thing though, maybe its because I refered to it as casing, not case.

[importer]

Nismo bolts, are they Special ? No ! They were originally used on ALL S-15 helicals until Nissan used up their supply of S14 ring gears.

Do you Need them ?? NO ! 99% of all S15 helicals are installed into the 240SX using the stock bolts. And I have yet to hear of a single failure !

The weakest point on any bolt is the threads. These 'special' bolts have the same thread size as the bolts that will come out of your 240SX. And if you are making so much power that you need larger bolts, then you better go to the S15 gear set that has the Larger thread size!

Of the hundreds of S15 Helical LSDs that I have sold, few people ask for the bolts.

After dozens of eRip auctions I have run for the bolts separately, I have only sold 2 sets in 6 years...... And I only ask 3/4s of what Nismo sells them for ($45 vs. $60)

Save your hard earned bucks, Just clean the ring gear threaded holes with a good solvent, use a good strong thread locker, and torque them to factory spec.s.

[Red coupe]

DO YOU WANT A JDM RIDE OR A CHINEES RICKSHAWI just don't want bolts in my drive train to fit with a whole millimeter of play.

[S14Driftet]

I agree, i have an S15 diff at home and i took a bolt out of my blown S14 VLSd and the play just seems like to much to wanna have there...Those bolts on Japanparts.com Those are the 12mm thread and 13mm shank correct?

[94_240sx]

Those bolts on Japanparts.com Those are the 12mm thread and 13mm shank correct?

Yes, that's correct.

I read this somewhere. Diff bolts shouldn't be reused because they stretch from the first installation. On the other hand, I haven't heard any problem from people who reused ones from s13 open diff.

[chandler]

talk about back from the dead, ive already got 2 ae86's and they come with the clutch type lsd, and its fun as hell. so I might go that route with my s14\