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Old 06-15-2005, 11:25 PM   #1 (permalink)
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Default Torque Specs - Head Bolts

I need torque specs for head bolts. I heard it was 90 ft/lbs in a certain order. What about the 12mm bolts on either end of the heads? There are 2 on each end of each head. Do these need to be torqued? If so, how much? Then I will put on the valve covers, which I will be using an in/lb wrench for. After that I need to put on my upper plenum. Any torque specs I should know for that? I am rebuilding an engine with very little previous experience...help me do it right. Also, this is a 3.15 liter TT. Thanks.
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Old 06-16-2005, 03:08 AM   #2 (permalink)
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Default Re: Torque Specs - Head Bolts

The 10mm allen bolts that hold the head on need to be torqued to 90lb.ft. in a criss-cross pattern in three steps. I do 30-60-90 starting from the inside out and never doing two adjacent bolts in order. Then you need to heat-cycle the engine (get it up to full operating temp) and let it cool completely overnight, then retorque the headbolts as they may have loosened. For some added insurance, repeat that step. If you're way into over-kill, like me, do it again.
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Old 06-16-2005, 03:36 AM   #3 (permalink)
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Default Re: Torque Specs - Head Bolts

3.15L? Did you have the block sonic wall tested? I mean the cylinder to jacket clearences gotta be crazy small.
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Old 06-16-2005, 03:38 AM   #4 (permalink)
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Default Re: Torque Specs - Head Bolts

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Originally Posted by Lucky31337
3.15L? Did you have the block sonic wall tested? I mean the cylinder to jacket clearences gotta be crazy small.
They are! that's 0.120" overbore, not fucking around. I settled for the 080 overs not wanting to mess with scarey thin walls. That and 3100GT sounds better than 3150GT
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Old 06-16-2005, 03:47 AM   #5 (permalink)
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Default Re: Torque Specs - Head Bolts

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Originally Posted by doctorstupid
They are! that's 0.120" overbore, not fucking around. I settled for the 080 overs not wanting to mess with scarey thin walls. That and 3100GT sounds better than 3150GT
Personally, I would rather have the stronger walls, I think 3.1L is ok, but 3.15L! the difference in the two is roughly 50 over the 3.1L
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Old 06-16-2005, 08:09 AM   #6 (permalink)
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Default Re: Torque Specs - Head Bolts

Sorry about that, it was late and I was trying to figure out how much .080 over is. So yes, I have a 3.1L and not a 3.15L. Anyway, how about those 12mm bolts on the ends? Do those need to be torqued at all? Gotta know before I slap on the valve covers.

One more question. My oil pan bolts wouldn't hand-tighten so I had to use a ratchet. Because of this, they may be too tight since they are only supposed to go to 5 ft/lbs. Will this cause my oil pan to crack?
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Old 06-16-2005, 08:15 AM   #7 (permalink)
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Default Re: Torque Specs - Head Bolts

Quote:
Originally Posted by RedDragonVR4X3
Sorry about that, it was late and I was trying to figure out how much .080 over is. So yes, I have a 3.1L and not a 3.15L. Anyway, how about those 12mm bolts on the ends? Do those need to be torqued at all? Gotta know before I slap on the valve covers.

One more question. My oil pan bolts wouldn't hand-tighten so I had to use a ratchet. Because of this, they may be too tight since they are only supposed to go to 5 ft/lbs. Will this cause my oil pan to crack?
Kind of crazy to do an engine rebuild without a service manual. You can get bits/pieces of data at www.stealth316.com or order a manual on CD for $35.



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Old 06-16-2005, 04:18 PM   #8 (permalink)
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Default Re: Torque Specs - Head Bolts

What 12mm bolts on the ends? The only ones I'm seeing are the cam caps...
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Old 06-16-2005, 04:54 PM   #9 (permalink)
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Default Re: Torque Specs - Head Bolts

Quote:
Originally Posted by doctorstupid
What 12mm bolts on the ends? The only ones I'm seeing are the cam caps...
("ends" = cam caps???)


still seems like suicide to attempt a rebuild without a manual / specs in hand.
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Old 06-16-2005, 06:06 PM   #10 (permalink)
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Default Re: Torque Specs - Head Bolts

Im confused. Doctorstupid = RedDragonvr4?
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