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YOUR RESEARCHPSA ::: 95% of all M96/7 head bolts are re-useable ..
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Replace these
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PSA ::: 95% of all M96/7 head bolts are re-useable ..
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Leading evidence: 'Replace these' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace these' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
It's a shame to replace things that don't need to be replaced.
PSA ::: 95% of all M96/7 head bolts are re-useable ..
Tighten fastener
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Suggestion · Original poster
The Torque + Angle method of tightening is just a more accurate way of tightening a fastener..
PSA ::: 95% of all M96/7 head bolts are re-useable ..
Use any low friction products
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Suggestion · Original poster
Caution ::: Be careful on "standard Torque Specs" ( not Torque + Angle * Method ) using any low friction products on the threads or under the bolt heads.....If the Standard Torque Specs are not designed for this, you will over-twist the bolt and snap the head off before even reaching the Torque Specs...
PSA ::: 95% of all M96/7 head bolts are re-useable ..
Use any low friction products
No successful repair reported for this finding.
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Suggestion · Original poster
Caution ::: Be careful on "standard Torque Specs" ( not Torque + Angle * Method ) using any low friction products on the threads or under the bolt heads.....If the Standard Torque Specs are not designed for this, you will over-twist the bolt and snap the head off before even reaching the Torque Specs...
PSA ::: 95% of all M96/7 head bolts are re-useable ..
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2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Do with this info as you wish ...
95% of all m96/7 head bolts are not TTY ( Torque - to -Yield ) and can be re-used....
The way to tell :::
The early m96 head bolts 97-98-99 that used a
T50 Torx
bit and were M10 x
234mm long
were TTY and were not to be re-used
These were replaced in 1999 with
T55 Torx
head that were M10 x
230mm long
and could be re-used
I have posted this before but it has been years and is lost deep a Thread Rabbit hole, but with so many new owners of M96 powered cars I thought it may be usefull to a few and save someone $500
I know of one guy who went back into the engine for some reason to correct a small mistake and bought another set of bolts because he had allready torqued them down...They used to be $4 a bolt but now they are over $20 a bolt ....so two sets over $1000 bucks
Just because a torque spec calls for a Torque + Angle does not mean for sure it is a TTY fastener.....
The Torque + Angle method of tightening is just a more accurate way of tightening a fastener.. Torquing alone is not that accurate because 80% of the torque is used to overcome the friction of the threads and not to stretch/load the bolt...Only 20% of the Torque is used to actually stretch/load the fastener.
Example...An m10 x 1.0 thread after seating and gasket crush , a 180* Angle will stretch the bolt exactly 0.5mm irregardless of the torque it takes to turn the bolt against the friction of the threads/bolt head......
Caution ::: Be careful on "standard Torque Specs" ( not Torque + Angle * Method ) using any low friction products on the threads or under the bolt heads.....If the Standard Torque Specs are not designed for this, you will over-twist the bolt and snap the head off before even reaching the Torque Specs... I have seen this a bunch on Chevy LS engines...
All bolts go into an elastic/spring stage before going into a plastic deformation stage after yielding ...If a bolt is never stretched past the elastic/spring stage, then it hasn't yielded or lost any of its original strength..
A Pro Wrencher can "feel" when/if a bolt yields...
Use this info as you wish ...
