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  3.8 out of firebird Head bolt pattern and torque

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3.8 out of firebird Head bolt pattern and torque by Sabenn_88_notch
Started on: 12-01-2013 09:18 PM
Replies: 9 (375 views)
Last post by: Sabenn_88_notch on 12-03-2013 10:45 PM
Sabenn_88_notch
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Report this Post12-01-2013 09:18 PM Click Here to See the Profile for Sabenn_88_notchClick Here to Email Sabenn_88_notchSend a Private Message to Sabenn_88_notchEdit/Delete MessageReply w/QuoteDirect Link to This Post
Changing the head gaskets on my 3.8 v6 and am wondering what torque the head bolts need to go on at, and what pattern do I torque them down in?

Thanks,
-Zach

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Custom2M4
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Report this Post12-01-2013 09:29 PM Click Here to See the Profile for Custom2M4Click Here to Email Custom2M4Send a Private Message to Custom2M4Edit/Delete MessageReply w/QuoteDirect Link to This Post
Start middle bolts and work outward, 37 ft lbs to all, then + 120 deg to all. It's a two step torque spec.

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[This message has been edited by Custom2M4 (edited 12-01-2013).]

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Sabenn_88_notch
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Report this Post12-02-2013 09:33 AM Click Here to See the Profile for Sabenn_88_notchClick Here to Email Sabenn_88_notchSend a Private Message to Sabenn_88_notchEdit/Delete MessageReply w/QuoteDirect Link to This Post
My apologies it is for a 3.4 V6 not a 3.8. a typo on my part, is it the same pattern and torque for that engine as well?
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Gall757
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Report this Post12-02-2013 10:04 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
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Sabenn_88_notch
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Report this Post12-03-2013 11:20 AM Click Here to See the Profile for Sabenn_88_notchClick Here to Email Sabenn_88_notchSend a Private Message to Sabenn_88_notchEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks for the welcome!

And just to make sure I'm going to get this right I start in the middle of the heads and giving them each 37 ft lbs until all are tight
Then I go back in the same pattern as before and turn each bolt an extra 120° of rotation?
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Bloozberry
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Report this Post12-03-2013 11:50 AM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
Not according to the link that Gall757 posted. Follow the order shown in the little numbering sequence like this:


*Manifold Side*

6 2 3 7

5 1 4 8

* Outer Side *

...and tighten all of them to 41 lbft, then return for a second pass tightening them a further 90 degrees rotation in the same sequence:
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Lou6t4gto
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Report this Post12-03-2013 01:18 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
That's for a 3.8, he HAS a 3.4 different
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Gall757
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Report this Post12-03-2013 01:54 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
The correct numbers for the 3.4 are 41ft/lbs and 90 degrees. Those other numbers belong to the 3.8 (37ft/lbs and 120 degrees). It sounds to me like the bolts all end up just about the same....but you never know.
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Sabenn_88_notch
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Report this Post12-03-2013 10:07 PM Click Here to See the Profile for Sabenn_88_notchClick Here to Email Sabenn_88_notchSend a Private Message to Sabenn_88_notchEdit/Delete MessageReply w/QuoteDirect Link to This Post
I torqued the heads down at 41 and then I went back put the extra 90° on it and it equated to something around 150 foot pounds... That seems like a lot or is it normal
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Sabenn_88_notch
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Report this Post12-03-2013 10:45 PM Click Here to See the Profile for Sabenn_88_notchClick Here to Email Sabenn_88_notchSend a Private Message to Sabenn_88_notchEdit/Delete MessageReply w/QuoteDirect Link to This Post
Actually it was around 100 ft lbs
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