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Gtir Motorsport club » Tech room » Help and Advice » Head bolts?

Head bolts?

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1 Head bolts? on 10th July 2015, 8:25 pm

hagger


Hello once again pulsar people.Can anyone tell me the length the standard head bolts are supposed to be as i can only find the length of the sr20de bolts in the work book (158.2mm). The bolts i have removed are about 180mm.Any info would be of great help... cheers

2 Re: Head bolts? on 10th July 2015, 9:25 pm

Gostek

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I've just measured mine and they come around 175mm (used ones)

3 Re: Head bolts? on 10th July 2015, 9:42 pm

hagger


just measured them properly and they are 180.1mm (from thread end to base of bolt head) Did nissan make loads of different lengths? The only reason i need to know is just to see if they have stretched or if i can use them again.Bit confused now............. as per normal ;-)

4 Re: Head bolts? on 10th July 2015, 9:45 pm

Gostek

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If i won't forget I'll get mine vernier tomorrow and measure them again and see you if autodata has anything about it


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5 Re: Head bolts? on 10th July 2015, 10:04 pm

johnny gtir

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I have a new set still in boxes I could measure but at work tomorrow untill late

6 Re: Head bolts? on 10th July 2015, 10:06 pm

nomad

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They are stretch bolts arent they .... i cant seem to find what length oe studs are new ....


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7 Re: Head bolts? on 10th July 2015, 10:14 pm

hagger


That would be cool if you could measure a new set, then i would have a reference to work too. cheers dudes...

8 Re: Head bolts? on 10th July 2015, 10:20 pm

hagger


just noticed ive made 100 posts in 2 years........... im fookin useless lol ;-)

9 Re: Head bolts? on 10th July 2015, 10:52 pm

nomad

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Not everyone is cut out to be a postwhore  Laughing


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10 Re: Head bolts? on 11th July 2015, 12:41 am

buckym120

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The online workshop manual has the correct lengths in which is acceptable as they are stretch bolts.

11 Re: Head bolts? on 11th July 2015, 7:28 am

GTIR James


As Bucky says. I'm sure the manual states you only measure the threaded section of the bolt to determine if they are reusable.

As a general rule tho if they have only been torqued down once they will be ok to use again

12 Re: Head bolts? on 11th July 2015, 7:56 am

hagger


The manual shows you measure the full length of the bolt not just the threaded section (not the bolt head though) on page 207, but it only gives sr20de lengths not sr20det lengths.I dont mind buying new ones but would like to reuse the originals if i can.

13 Re: Head bolts? on 11th July 2015, 8:32 am

buckym120

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So it does in that case no idea, I just bought new ones to be on the safe side

14 Re: Head bolts? on 11th July 2015, 9:12 am

gtir_woody

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@nomad wrote:Not everyone is cut out to be a postwhore  Laughing

Number 1 post whore ^^ Laughing

15 Re: Head bolts? on 1st December 2015, 5:00 pm

Cosmic73

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Hello all,
I'm bring this thread up again to ask if anyone has ever reused their DET head bolts?
I've got 20 of them and have just been to the gage labs where i used slip rings.
If i set the slip rings to 180.43mm, 10 of the bolts are under this length and 10 of the bolts are over this length,
So, could i re-use the 10 bolts that are less then 180.43mm in length?
Its a shame to bin them all and it'll save a few quid with my rebuild costs
Smile Smile Smile Smile Smile

16 Re: Head bolts? on 1st December 2015, 5:56 pm

Mr B

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I would reuse them, i've used one set at least 3 times. they don't show specs so would assume they not tty bolts. for a big power build I would be fussy but for most stuff reusing bolts has no problems .

17 Re: Head bolts? on 1st December 2015, 9:04 pm

Cosmic73

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@Mr B wrote:I would reuse them, i've used one set at least 3 times. they don't show specs so would assume they not tty bolts. for a big power build I would be fussy but for most stuff reusing bolts has no problems .

Well bugger me Shocked Shocked
Never thought id see the day that Mr B says re-use old parts,
I was on the verge of ordering new ones aswell, now im not sure.

If my experience of std bolts is correct the lengths are usually specced to the nearest 5mm, so these bolts wouldve originally been 180mm long so they've stretched ~0.43mm, about 0.24% which naff all i suppose,
Is it common knowledge that these are re-used?
Smile

18 Re: Head bolts? on 1st December 2015, 10:31 pm

Stu

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We re used mine when we rebuilt my engine in 2009. Its still going strong Smile


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19 Re: Head bolts? on 1st December 2015, 10:46 pm

Cosmic73

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@Stu wrote:We re used mine when we rebuilt my engine in 2009. Its still going strong Smile
Well thats decided then, ill re-use them Smile Smile
Same goes for the flywheel and main cap bolts,
Cheers
Smile

20 Re: Head bolts? on 1st December 2015, 11:03 pm

Mr B

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Standard head bolts get reused a lot without issue, it one of the extra durable bits of the 54C along with the standard conrods, worth putting in set of arp conrod bolts though .

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