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HONES petrol head
Joined: 04 Feb 2002 Posts: 1786
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Posted: Fri Jan 16, 2004 1:29 am Post subject: Re-tensioning Head Down. |
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Ok, its about that time i do it.
What sequence do i do it in? 1-8 front to back opposite what?
i got the torque wrench set to approx 74 pbft or ftpb. something like that...
so i gotta crack them and then tension them up...
anyone?
taa
matt |
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HONES petrol head
Joined: 04 Feb 2002 Posts: 1786
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Posted: Fri Jan 16, 2004 1:33 am Post subject: Re: Re-tensioning Head Down. |
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oh yeh, drain radiator before hand.
it'd be ok to use the same rocker cover gasket wouldnt it??...just a lil grease or silicon to seal her up is cool right. |
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MJ newbie
Joined: 03 Nov 2001 Posts: 8
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Posted: Fri Jan 16, 2004 3:08 am Post subject: Re: Re-tensioning Head Down. |
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What Engine is it ?, If G161, if Starting from the middle of the head, ie between pots 2 and 3. its those head bolts first. so from front of the engine it would be like this LHS ( your looking towards the rear of the engine ) 9,5,1,3,7 and RHS 10,6,2,4,8. With 9 and 10 being the two little bolts ( inside head ) that bolt through the head into the top of the timing case don't over tightn these as you will either strip the thread out of the T/Case or shear the bolts off .
9 5 1 3 7
* * * * *
FNT Rear
* * * * *
10 6 2 4 8
When Tensioning the Head down it's a three stage process ( diff torque settings each time ). From Memory you have to crack the bolts first then do the re-tensioning.
MJ. |
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MJ newbie
Joined: 03 Nov 2001 Posts: 8
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Posted: Fri Jan 16, 2004 3:16 am Post subject: Re: Re-tensioning Head Down. |
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opps damn typo " With 9 and 10 being the two little bolts " should read " 11 and 12 " ..... |
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Stock TE backyard mechanic
Joined: 12 Mar 2002 Posts: 853
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Posted: Fri Jan 16, 2004 3:23 am Post subject: Re: Re-tensioning Head Down. |
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Almost right
10 6 2 3 7
* * * * *
FNT Rear
* * * * *
9 5 1 4 8
and when retensioning dont you only tighten it to the third stage of tightening (not sure on this bit) |
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MJ newbie
Joined: 03 Nov 2001 Posts: 8
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Posted: Fri Jan 16, 2004 3:35 am Post subject: Re: Re-tensioning Head Down. |
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LOL yeah it doesn't really matter which side you start just as long as you continue the same way all the way through. Hmmm i think so, been to long since i last did one. That was the old engine that was in 95 when i did that one. It was just a standard 60th over, full rebuild, pistons, rings ect.. lumpy cam, port'n'polished head, electronic ign. Got a new project about to start soon, an EFI DOHC G200. |
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Stock TE backyard mechanic
Joined: 12 Mar 2002 Posts: 853
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Poida tinkerer
Joined: 29 Aug 2003 Posts: 303 Location: Vic/NSW border
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Posted: Fri Jan 16, 2004 12:13 pm Post subject: Re: Re-tensioning Head Down. |
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Ok I have in front of me a genuine ISUZU manual for the G161Z engine. It shows the correct tension sequence as:
F 7 3 2 6 10 R
T 8 4 1 5 9 R
It states to tighten in two steps, firstly to 8.5 kg-m then finally to 10 kg-m.
I can't find reference to cracking the head bolts before retorquing and I've never found any reference manual suggesting cracking a boly prior to retorquing. I'd not suggest you crack a torqued bolt. Just retorque to check it is at the correct final torque setting. It may not need any adjustment. Retorquing is a form of checking. _________________ I try to tackle one day at a time, but often several days attack me at once.
(The views I present are my own and NOT necessarily of the administrators or other members of this site.) |
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Racegem backyard mechanic
Joined: 30 Jan 2002 Posts: 987
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Posted: Fri Jan 16, 2004 5:00 pm Post subject: Re: Re-tensioning Head Down. |
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Depends who writes the book...
Start with the middle two and work out from there, either clockwise, anti-clockwise, or opposites, it doesn't really matter. The critical thing is to get the tension evenly spread across the head rather than all down one side or from one end. That's why when you're fitting the head the first time, you start with a small tension setting and do the lot, increase the setting and do them again, and so on... just don't do the two at the front the same as the rest!
I would agree that you shouldn't have to crack them first, you're only checking that they're at the final tension. |
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Sprocket rice boy
Joined: 10 Nov 2003 Posts: 21 Location: Griffith , N.S.W
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Posted: Sun Jun 17, 2007 9:02 pm Post subject: |
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To do it right ..start from the center as if you are tensioning the haed for the first time . Now one at a time crack the head stud/bolt and tension to the final setting DONT CRACK ALL OF THEM AT ONCE.!!!
BINGO you have now tensioned your head |
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HONES petrol head
Joined: 04 Feb 2002 Posts: 1786
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Posted: Mon Jun 25, 2007 5:01 pm Post subject: |
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oh ok, cheers
READ THE DATE OF THE ORIGINAL POST
YOUR HELPING ME FROM WHEN I POSTED IT 3 YEARS AGO |
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MR_GEMI hod rodder
Joined: 05 Oct 2001 Posts: 7826 Location: Adelaide
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Posted: Tue Jun 26, 2007 11:13 am Post subject: |
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how good was 3 years ago _________________
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LOK15 tinkerer
Joined: 11 Dec 2001 Posts: 418 Location: BrIsBaNe Or IpSwIcH
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Posted: Tue Jul 10, 2007 10:57 pm Post subject: |
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MR_GEMI wrote: | how good was 3 years ago |
better than 6 years ago _________________
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MR_GEMI hod rodder
Joined: 05 Oct 2001 Posts: 7826 Location: Adelaide
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Posted: Wed Jul 11, 2007 4:05 pm Post subject: |
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LOK15 wrote: | MR_GEMI wrote: | how good was 3 years ago |
better than 6 years ago |
i dunno.... 6 years ago was pretty good too! this time 6 years ago i was preparing for my 18th, cant even remember what i did for my 18th so it must have been good! _________________
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