Quote:
Originally Posted by wpoll
Seriously - these things are fragile. Install torque is like 18Nm, release is like 25Nm max - since they shear off at about 26Nm!! 
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Actually according to manufacturer (Beru) the shear torque on these (M10 thread) is 35 Nm.
Their recommended tightening torque is 15 Nm, BMW recommends 18 Nm.
https://www.beruparts.eu/content/dam...glow-plugs.pdf