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Correct torque for head bolts?

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R
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BlackBart
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Re: Correct torque for head bolts?

Post by BlackBart »

Jibbaman150 wrote: ↑04 Nov 2019, 12:09 Ok here are my cylinder walls, only 100k miles on the car so I’m really hoping these aren’t scratches..
These appear to be the original honing marks in the cylinders, and they look nearly new.

These are not up and down wear scratches from piston movement.
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volvolugnut
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Post by volvolugnut »

Yup. Typical honing marks - not scratches.
Bolt torque is an approximate method to get the desired stretch (squeeze of joint) on bolts. Torque and turn is improvement over torque only. The best method is actual measure of the bolt length increase from end to end, but that is not practical for head bolts.
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