solution to sr20det manifold nuts backing off... ?

[sepulchral]

some hick guy at the local napa near my school recommended using

Shake proof washers
http://www.bigtoolbox.co.uk/userdata/SPIC-401.jpg

these are internally toothed shakeproof washers, that scratch into the metal to help reduce possibility of a nut backing off..

the guy have me a handfull of these for free, they are some kind of nickel metal, i dont know if i should use it or not or are these worth a try if i got a higher grade metal ?

what do yall think?

[blu808]

http://www.ben.com/tools/sp175plus.jpg

[sepulchral]

no thanks, anyone?

[sepulchral]

i welded my last turbo on to the manifold studs, it worked, but im not going to do it again.

[fromxtor]

I say lock nut, we use them on aircraft brakes and they dont come loose. ;) That and maybe use a torque wrench and actually torque them, sometimes things have to be more than good-n-tite. :D

Btw before anyone thinks about flaming this post, I am an Aircraft Hydraulics System tech and have been for years. :nod

[sepulchral]

what kinda locknuts??? nylon will melt, im sure locknuts wont work at all

[GSXRJJordan]

yeah nylon or normal loctite goes to sh*t at the temps that exhaust manifolds hit.

Also, I dont know if I'd trust those little washers to hold the nuts on, because its the insane vibration that the turbos make that cause the nuts to back off... I just have a feeling that vibration is gonna come right through those washers.

What I've used is ARP hardened studs (I've had the studs break a couple times), with a special high temp loctite (2690 or 2960 or something, got it from allspec.com (sp?) with some soldering tools) and it's designed to maintain 100% locking ability at 240* C or something insane like that. Works well, but not perfectly every time... still looking for the wonder fix...

[slideways2004]

i am having the same problem right now. and i want to get a better solution before i put the turbo back in the engine

[HyperTek]

lock washers.. hmm i wonder why yours are backing off.. heat expands the metal, maybe your nuts arent tight enough?

[sepulchral]

hyper: the heat expand, contracks, the nuts turn over time with constant vibration and the thermal expansion, lock washers ive used have seized up.. turning basically to normal washers... i think i may weld, dunno though.

[SidewaysNJ]

i had that problem too...i used the red loc-tite on the threads, loc washers under the nuts and the best thing you can do is double nut the studs.....should never come loose.

[TheSquidd]

Lock washers on mine, I've had bolts fall out. My car sounds like utter shit all the time. I hate these god damn motors.

[blu808]

Im tellin ya the only effective way is to tighten everything up, and put a tiny little tack weld on the nut, stud, and turbo

[bigOdom1]

wire them (post

[DRIFTING_SIL_EIGHTY]

ive had the same problem before. with all the vibration from the motor/road conditions their bound to come loose. ive tried loctite, lock washer, and lock nuts. best way to keep em on is to tack weld it. or if your's was once stock and untampered (like mine) it came with this http://phase2motorsports.stores.yahoo.net/nisrt25tulop.html so either cough up the money or make your own. basically it goes like this.....manifold-> gasket-> turbo-> plate-> washer-> nut. then you bend the tab to lock the nut it place.

DONE !

hope this helps.

[drifter808]

could look for the locknuts that use metal instead of nylon. I go a few of them but there 10mm size. meant for high heat. The nylon is basically replaced with 3 pieces of metal that lock it on. if you've seen them before then you know what im talking about if not it might be kinda hard to understand.

Also the locking plates help out alot.

[fliprayzin240sx]

+1 Locking plates...I mean shiet if your so worried bout it, buy new plates from the dealers. I mean ive had that shiet happen to me too, got tired of it, so i bought fresh plates from nissan and slapped it on. Havent had any issues yet...

[sepulchral]

wire them (post
wire them??????????????????????????????????????

[TheSquidd]

Yeah I lost one of mine. Ugh It's such a bitch to take the turbine off.

My bolts on the manifold > turbine, turbine > elbow, and elbow > downpipe all back off. The gaskets are owned too. :rl:

[statik]

+1 Locking plates...I mean shiet if your so worried bout it, buy new plates from the dealers. I mean ive had that shiet happen to me too, got tired of it, so i bought fresh plates from nissan and slapped it on. Havent had any issues yet...

agreed, dealer part, works perfect

[3day240sx]

has anyone ever tired a lock nut of them. the nut is tapered in the treads so when you tighten it down it locks to the bolt. some are made with a piece of plastic to lock it on but there are some that are all steel.

[TheSquidd]

I have steel locknuts on mine. They are loose. ;)

[zenki-217]

Ive been havng this same damn prob lately and Im sick of it... I bought poly eurotheyne exhaust mounts hoping to calm down some of the shake now the exhaust wont move at all.. Just used some red loctite and has seemed to work so far has came lose this week anyways....
Any of you guys having this problem have the downpipe bracket mounted?
And what are these nissan locking plates you guys are talking about?

[fromxtor]

theres all metal lock nuts that have are castlated and have little cuts to it wont back off. Or you could safety wire the nuts you already are using also. They look like this : http://www.gototem.com/Webgifs/ClipArt/Fasteners/LockNut.GIF you could probably get them at your local hardware store.

[3day240sx]

has anyone ever tried stainless stell or chromeoly bolts and nuts.

[sepulchral]

i ordered dealer parts... does anyone freaking know what these people mean by safety wire???

[zenki-217]

i ordered dealer parts... does anyone freaking know what these people mean by safety wire???
Are they talking about maybe using a cooterpin?

[projectRDM]

Safety wire or a small tackweld. The weld can always broken loose if needed.

[mrk9182]

this is what you guys need

http://www.boltdepot.com/product.aspx?cc=15&cs=125&cm=70

they are prevailing torque nuts its basically an all metal lock nut. they are used in many OEM applications for exhaust mani and turbo studs

[LB.Motoring]

i ordered dealer parts... does anyone freaking know what these people mean by safety wire???

wiring around it,

i would suggest the locking nuts, maybe with a combo of locking washers, or if you wanteded to go extreme, you could do like the machine studds do, and have a hole drilled tapped into the studd and you put a saftey wire through and pulled on the the nut...

GLuck

http://myword.info/images/lock_washer_1b.gif

[anthony240]

cooterpin?
ROFL! good one!
it's cotterpin, and i think it's a smart idea

[fromxtor]

This is the best civilian safety wiring guide i've found : http://www.rc51.org/wire1.htm

Safety wire is a method used in alot of different fields to prevent nuts and bolts from coming loose due to vibration. Basicly you use nuts/bolts with holes drilled in them and wire them togather in a way that pulls tight (to the right) so if one nut/bolt tries to come loose it pulls the other to the right preventing threading off. :) Here's a few more, I use this on my F-15s so I'm pretty sure it will prevent your nuts from vibrating off.

http://robrobinette.com/safety_wire.htm
http://www.ultralightnews.com/pilotslounge/safetywire.htm
http://store.summitracing.com/partdetail.asp?Ntt=safety+wire&N=-113344&part=MOR-62280&autoview=sku&Ntk=KeywordSearch

[TokyoNights]

I got these copper nuts at autozone where the top of the nut is cut halfway and bent up
plus added some lock washers
never had the problem again