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Gtir Motorsport club » Tech room » Help and Advice » Turbo studs failing

Turbo studs failing

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1 Turbo studs failing on 20th January 2019, 4:52 pm

Osmax90


Hi guys,
My turbo bolts ( manifold to turbo) failed twice,
First time one broke. (5 years old, maybe normal)
Second time, I installed new gasket and 4 new stud and nuts. (From UK turbo company)
But now they are losening  .  .  .

Any tips or tricks?
Wich ones are you guys using?

2 Re: Turbo studs failing on 20th January 2019, 6:06 pm

johnny gtir

johnny gtir
moderator
moderator
You seen the locking tabs ?
Check on heat but high tensile trouble is if they snap in you might not get them out. If just loose lock tabs

These are just any ones not saying they fit your turbo

https://www.google.co.uk/search?q=turbo+locking+tabs&ie=UTF-8&oe=UTF-8&hl=en-gb&client=safari

https://www.google.co.uk/search?q=driftworks+high+temp+lock+nuts&ie=UTF-8&oe=UTF-8&hl=en-gb&client=safari

3 Re: Turbo studs failing on 20th January 2019, 6:34 pm

Osmax90


These nuts i'm using,
Doesn't seem to work.
Maybe it's the gasket . . .

4 Re: Turbo studs failing on 20th January 2019, 8:36 pm

mike74

mike74
Dont use the perforated type of gasket here, only the pressed steel one. I used a perforated one the first time i took the turbo out and it only lasted about 6 months before disintegrating and allowing the nuts to loosen. Next time round i replaced it with the pressed type and its been fine so far

5 Re: Turbo studs failing on 20th January 2019, 11:41 pm

Mr B

Mr B
gtir technician
gtir technician
oem are cheap enough and way better quality than any aftermarket options .

6 Re: Turbo studs failing on 21st January 2019, 12:22 am

Osmax90


Ok Mr B, OEM studs.
Nuts also OEM?
Gasket metal folded?
Or flat metal with one rib in it?

7 Re: Turbo studs failing on 21st January 2019, 12:24 am

Osmax90


Will use locking tabs also

8 Re: Turbo studs failing on 21st January 2019, 7:23 am

astarozna

astarozna
I use copper nuts, seem to do the job well so far. Surfaces need to be flat as well. If using aftermarket exhaust make sure it doesn't put to much pressure on the turbo, twisting can cause then to come loose as well.

9 Re: Turbo studs failing on 21st January 2019, 9:15 am

mike74

mike74
Last time I did the turbo I fitted these as my locking tabs looked like they were the originals:
https://www.ebay.co.uk/itm/Kenjutsu-Manifold-to-Turbo-Locktabs-Locknuts-For-RNN14-Pulsar-GTiR-SR20DET/131704630251?hash=item1eaa352beb:g:XkQAAOSwa-dWnRl0:rk:18🇵🇫0

one of these for the manifold to head: (perforated one fitted looked like it had been blowing slightly!)
https://www.ebay.co.uk/itm/Cometic-MLS-Steel-Exhaust-Manifold-Gasket-For-RNN14-GTiR-Pulsar-SR20DET/152952444421?hash=item239cad1605:g:veUAAOSwFeNa4xPY:rk:20🇵🇫0

one of these for the manifold/turbo join:
https://www.ebay.co.uk/itm/Kenjutsu-Folded-Stainless-T28-Manifold-Turbo-Gasket-RNN14-GTiR-Pulsar-SR20DET/112807456953?hash=item1a43d930b9:g:zJkAAOSw07Vafsco:rk:36🇵🇫0

and one of these for the elbow/downpipe join:
https://www.ebay.co.uk/itm/UNIVERSAL-3-3-BOLT-EXHAUST-DOWNPIPE-DECAT-GASKET/263163386368?epid=2163864809&hash=item3d45c29a00:g:BU4AAOSwsW9YwR8L:rk:14🇵🇫0

Note that this ^^^ one has a reinforcement ring on the inside to help stop it burning away.
As you've probably gathered, I wasn't wanting anything to leak or come loose this time round!

10 Re: Turbo studs failing on 21st January 2019, 3:39 pm

DC313

DC313
^^^^ Nice! Think I might need to get myself all those bits to!

11 Re: Turbo studs failing on 21st January 2019, 3:59 pm

mike74

mike74
^^^ not cheap but piece of mind  Wink

12 Re: Turbo studs failing on 21st January 2019, 7:31 pm

Osmax90


Ordered some kenjutsu parts,
Will go to nissan for the OEM studs.
Just not sure about the gasket, I had a metal folded gasket and it came lose.
Anyone uses the flat gasket with one rib?

13 Re: Turbo studs failing on 21st January 2019, 8:42 pm

mike74

mike74
Like the one i linked earlier or different design?

14 Re: Turbo studs failing on 21st January 2019, 8:52 pm

Osmax90


You link is metal folded,

This is what I ment;

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.fr%2Fulk%2Fitm%2F254016628631

15 Re: Turbo studs failing on 21st January 2019, 9:13 pm

mike74

mike74
Its not quite the same thing but ive got that style of gasket on my turbo/elbow join for about 18 months without issue. It should be fine i reckon Very Happy

16 Re: Turbo studs failing on 22nd January 2019, 12:16 am

splmum

splmum
I have been using those metal gaskets - manifold to turbo (4 hole) and turbo to dump (multi) for about 100,000 km, not a problem.

It is best to use the locknuts (also known as prevailing torque nuts or stiff nuts) that have a 'crush' in the head that acts as a self-lock. Most of these type are re-useable (once or twice before throwaway).

17 Re: Turbo studs failing on 22nd January 2019, 2:48 am

Mr B

Mr B
gtir technician
gtir technician
I use the oem nissan studs nuts and gasket, the graphite coated soft alloy when oem nissan is quite good and it only 18 of your GBP roughly .
Not had best results with jam nuts/k-nuts so I always lock tab what can easily, do diy lock tabs from stainless repair washers cut with tab and locating tongue if grind/drill recesses in flange for it to pair with .
the metal layer not bad and cheap in the US

18 Re: Turbo studs failing on 22nd January 2019, 7:40 am

Osmax90


Ok, lockingtabs ,OEM studs and metal folded gasket of will be.
Anyone knows nissan partnumber for the studs?

19 Re: Turbo studs failing on 22nd January 2019, 8:22 am

gtir_woody

gtir_woody
moderator
moderator
Are the locking tabs just used on the top nuts of the manifold or both?

20 Re: Turbo studs failing on 22nd January 2019, 10:40 am

mike74

mike74
They're used on the 4 studs that stick out the bottom of the manifold that the tubbie bolts on to. Once the tubbie is in place, the lock tabs go on and then the nuts. AFAIK the nuts you get with that Conceptua tuning locking tab kit have got those "prevailing torque nuts or stiff nuts" in it.

Its probably a good idea to get some of those nuts for the head/manifold too...I just remembered I put on copper plated versions of these last time I changed the turbo and they've not loosened at all!
Shouldn't seize either..hopefully

21 Re: Turbo studs failing on 22nd January 2019, 3:28 pm

Mr B

Mr B
gtir technician
gtir technician
OEM p/n

Studs 0826703010
Nuts   089128401A
Gasket 1403653J00


You may want make a support bracket from block to turbo to reduce vibration and stress to studs and gasket .



Last edited by Mr B on 22nd January 2019, 7:02 pm; edited 1 time in total (Reason for editing : Parts listed are manifold to block)

22 Re: Turbo studs failing on 22nd January 2019, 4:59 pm

Osmax90


Ok, thanks everybody.

23 Re: Turbo studs failing on 22nd January 2019, 7:01 pm

Mr B

Mr B
gtir technician
gtir technician
Stud for manifold to turbo is 1406401M00 and nut is 14432P7600 or 144320B700

24 Re: Turbo studs failing on 24th January 2019, 8:25 am

gtir_woody

gtir_woody
moderator
moderator
@mike74 wrote:They're used on the 4 studs that stick out the bottom of the manifold that the tubbie bolts on to. Once the tubbie is in place, the lock tabs go on and then the nuts. AFAIK the nuts you get with that Conceptua tuning locking tab kit have got those "prevailing torque nuts or stiff nuts" in it.

Its probably a good idea to get some of those nuts for the head/manifold too...I just remembered I put on copper plated versions of these last time I changed the turbo and they've not loosened at all!
Shouldn't seize either..hopefully

Ohhh of course, for some reason I was thinking the manifold to head Laughing

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