Head bolt torques and the 160 turn? - Engines Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Head bolt torques and the 160 turn?

MCH_GTi6

formerly mch

Location: Hayle

Registered: 09 Sep 2005

Posts: 2,456

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Post #1

Right, I have got the torque setting on the box of the headbolts and the settings from on here BUT

Done the stage 1 - 35nm / 26lb/ft
then the stage 2 - 70nm / 52lb/ft

stage 3 is a 160 degree turn

Now the thing is, the thing is really effin tight, I'm worried they'll snap if I try 90 let alone 160...

However the box has 4 stages not 3...

Stage 1 is the same
stage 2 is the same
stage 3 is to slacken 90degrees and re-torque to stage 2

then stage 4 is the stage 3 of the FAQ one

Now I dont wanna break the bolts off in the head so, what should i do?

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Posted 29th May 2012 at 18:02

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #2

man up

I have never snapped a bolt, only the torx bit Laugh my ass off

and even then, only when trying to loosen bolts.

I only do the three stage, so 35 70 160.

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Posted 29th May 2012 at 18:04

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MCH_GTi6

formerly mch

Location: Hayle

Registered: 09 Sep 2005

Posts: 2,456

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Post #3

so slacken? dont slacken?

and I do have a very sizeable bar/torque wrench to do them and still seems really effin tight

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Posted 29th May 2012 at 18:05

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #4

don't slacken no Smile

I use a 24" breaker bar, yes you have to put some effort in but its not that bad!

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Posted 29th May 2012 at 18:08

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MCH_GTi6

formerly mch

Location: Hayle

Registered: 09 Sep 2005

Posts: 2,456

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Post #5

90degree done but I can barely budge them and the bar I'm using must be 20"

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Posted 29th May 2012 at 18:23

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #6

did you oil the threads? as I said, man up Razz

if 62kg of welshpug can do it I'm sure anyone else can LOL

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Posted 29th May 2012 at 18:51

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ryangti6

Seasoned Pro

Location: Pontypool

Registered: 01 Sep 2006

Posts: 1,839

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Post #7

I had a conversation the other day with a trusted mechanic that told me about the loosening stage which is something I have never done or at the time heard of.
I was saying to him how hard I find it to achieve the 160 degrees as he was torquing up an Xsi head and he said I bet you don't loosen them and retorque before doing the final stage and told me this makes it easier apparently.

The last time I did a '6 head I got to 140 iirc and stopped as I could only see it ending up one way Tbh and like you I didnt want to risk snapping a bolt.

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Posted 29th May 2012 at 19:18

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MCH_GTi6

formerly mch

Location: Hayle

Registered: 09 Sep 2005

Posts: 2,456

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Post #8

welshpug! wrote:

did you oil the threads? as I said, man up Razz

if 62kg of welshpug can do it I'm sure anyone else can LOL

Yes oiled threads and the underside of the bolt head

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Posted 29th May 2012 at 19:58

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #9

I find the same problem as you... Yes

Therefore when I do them I generally do 35nm, 70nm and then about 100 degrees max. Yes

All the heads I have done have been fine with this. Smile

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Peugeot 306 GTi-6
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Posted 29th May 2012 at 23:02

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #10

bet you didn't do your superhighboost engine...

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Posted 30th May 2012 at 07:52

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #11

welshpug! wrote:

bet you didn't do your superhighboost engine...

No, I got Rich to do it. Yes

If he broke a bolt whilst tightening it up, it's not my problem then... LOL

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Posted 30th May 2012 at 09:13

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miles

Seasoned Pro

Location: Ringwood

Registered: 28 Dec 2002

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Post #12

160 is easy, try doing 300 on a Alloy block thread

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Posted 30th May 2012 at 09:30

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #13

miles wrote:

160 is easy, try doing 300 on a Alloy block thread

I'll leave that one to you mate... Thumbs up

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Peugeot 306 GTi-6
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Posted 30th May 2012 at 12:43

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ruan

Junior User

Location: Truro

Registered: 17 Sep 2009

Posts: 64

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Post #14

You're just stretching the bolt, it shouldn't get any harder to do - I find once you've done the first 45*, it just turns exactly the same, and you can feel them stretch.

I find it a total bas**rd if you've got an extension on the bar - take all extensions off, just straight on the socket/key if you can.

Posted 31st May 2012 at 00:18

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #15

I know they are stretch bolts, which is why they give you a tolerance when it comes to replacing them, but they just feel so springy like they want to break sometimes...

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Peugeot 306 GTi-6
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Posted 31st May 2012 at 14:12

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #16

and if they did break you'd take them back, just do it right Thumbs up

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Posted 31st May 2012 at 14:25

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roland rat

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Registered: 29 Nov 2006

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Post #17

stan_306gti6 wrote:

I find the same problem as you... Yes

Therefore when I do them I generally do 35nm, 70nm and then about 100 degrees max. Yes

All the heads I have done have been fine with this. Smile

What a wimp!

Ive done them to 160 with just a rusty hyper value socket and a spud-u-like spork! Wink

Posted 31st May 2012 at 14:29

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #18

roland rat wrote:

stan_306gti6 wrote:

I find the same problem as you... Yes

Therefore when I do them I generally do 35nm, 70nm and then about 100 degrees max. Yes

All the heads I have done have been fine with this. Smile

What a wimp!

Ive done them to 160 with just a rusty hyper value socket and a spud-u-like spork! Wink

@ Ashley!

Maybe I'll have more Weetabix then next time I do one... Thumbs up

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love

Posted 31st May 2012 at 16:08

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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

Posts: 3,702

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Post #19

stan_306gti6 wrote:

roland rat wrote:

stan_306gti6 wrote:

I find the same problem as you... Yes

Therefore when I do them I generally do 35nm, 70nm and then about 100 degrees max. Yes

All the heads I have done have been fine with this. Smile

What a wimp!

Ive done them to 160 with just a rusty hyper value socket and a spud-u-like spork! Wink

@ Ashley!

Maybe I'll have more Weetabix then next time I do one... Thumbs up

Think you need to Stan! LOL

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Posted 31st May 2012 at 19:20

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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #20

To be fair, it's not the case that I can't turn them 160 degrees, it's more that they give the 'feel' that they don't want to turn that far and stay in one piece...

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Peugeot 306 GTi-6
2000 (X), Moonstone Love

Posted 31st May 2012 at 21:16

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