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Old 03-10-2020, 04:13 PM   #1
Aqua Puttana
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Default Harmonic Balancer break out torque

A recent thread brought up how much torque it takes to remove a HB bolt.

Please add any information that you have here. I don't know how it has any real practical value, but information is most tomes good to have.

Originally Posted by marklg View Post
So the bolt would actually loosen with engine rotation, which explainss the extreme torque to deformation. And, why if not done correctly, things could go way South.


Originally Posted by Nautamaran View Post
That, and itís a big bolt!

Those 240 foot-pounds + 90 degrees on the 10.9 spec bolt gets it into its yield range (I donít know what the revised one gets?) where it has maximal recoil and thread friction...

Originally Posted by marklg View Post
The new bolt is, I believe actually weaker. With the same torque it could deform more. It always leaves me wondering why engineers do something. Going from a one piece key to a two piece makes sense. If the HB comes loose, it is less likely to damage the timing gear. Why they changed to a weaker bolt eludes me.


Originally Posted by Midwestdrifter View Post
Weaker bolt torqued to yield may be more resistant to fatigue cranking. It may also have more consistent clamping force. My van had the early bolt and it had loosened to about 95ft-lbs over 100k miles.
Originally Posted by Nautamaran View Post
Mineís a 10.9 bolt... my torque wrench reads both ways, so Iíll do my best to measure the break-out torque value when I remove it next week and report that data point.

Originally Posted by Aqua Puttana View Post
Unless corrosion or other factors are involved, I don't believe that a lower break out torque vs original is completely unexpected. It will be interesting to get some data on that.

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