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Correct torque for head bolts?

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Jibbaman150
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Correct torque for head bolts?

Post by Jibbaman150 » Sat Nov 02, 2019 1:38 pm

I have definitely researched this topic. Most of what read is 15 ft lbs first pass 44 ft lbs second pass then 130 degrees, on my 2005 xc70. Problem is that the machine shop I took my head to printed me out all my engine specs from AERA engine builders association. On the print out it says 15 ft lbs, 30 ft lbs, then 130 degrees. (30 not 44) so just looking to get some clarification from someone who’s done this before. Thank yal!



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Re: Correct torque for head bolts?

Post by gcha8e » Sat Nov 02, 2019 3:58 pm

Go up to 30, then the 130 degrees, if it feels right, keep it, or if not, give it another 45 degrees turn. You'll be fine. (no I have not done it before) :D



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RickHaleParker
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Re: Correct torque for head bolts?

Post by RickHaleParker » Sat Nov 02, 2019 5:09 pm

Per Volvo Vida:
Tighten the screws in sequence from the center and outwards.
Stage 1........20 Nm (15 Ft-lbs)
Stage 2........60 Nm (44 Ft-lbs)
Stage 3........130°
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Jibbaman150


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
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Re: Correct torque for head bolts?

Post by greg850r » Sat Nov 02, 2019 5:29 pm

I always use 44ft-lbs for the last torque before putting the dial on it.


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Jibbaman150
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Re: Correct torque for head bolts?

Post by Jibbaman150 » Sun Nov 03, 2019 9:24 am

Thanks guys, thanks Rick for the Vida reference.

Hey does anyone know what the cross-hatching is supposed to look like on the cylinder walls? Mine are at about a 60 degree angle and almost look like scratches. I have some pictures just got to figure out how to upload them.



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Re: Correct torque for head bolts?

Post by RickHaleParker » Sun Nov 03, 2019 9:39 am

Jibbaman150 wrote:
Sun Nov 03, 2019 9:24 am
I have some pictures just got to figure out how to upload them.
1. [Full Editor & Preview] Scroll down it is below the default editor.
2. Scroll down [Attachments]
3. [Add Files] select the pictures.
4. [Place inline]
5. [Preview]
6. Make formatting adjustments as needed.
7. [Submit]


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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Re: Correct torque for head bolts?

Post by abscate » Mon Nov 04, 2019 4:30 am

Typical error on torque wrenches is 25%, so don’t get too hung up trying to get these settings “ exact”

Try to be consistent, rather than exact. On the head, torque even-ness is more important than actual value,within reason. New bolts too, please.


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Jibbaman150
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Re: Correct torque for head bolts?

Post by Jibbaman150 » Mon Nov 04, 2019 12:09 pm

Consistently is key, got it!
Ok here are my cylinder walls, only 100k miles on the car so I’m really hoping these aren’t scratches..
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