Notes on calculating tightening torque when using insertion tool with various effective lengths. - AH00.00-P-0015-01CW
WARNING: This page is about a different car, the 2011 Mercedes-Benz C300, 2010 Mercedes-Benz C300, 2009 Mercedes-Benz C300, and 2008 Mercedes-Benz C300. However, it is still accessible from the selected car via links, so may be relevant.
The working length of the insertion tool (2) plugged onto the torque wrench (1) changes the leverage of the torque wrench (1). This in turn alters the actual tightening torque. Therefore the tightening torque to be set has to be calculated as a function of the working length of the insertion tool (2) and the specified tightening torque.
The following formula is used to calculate the torque to be set.