With this special release tool you lock the viscous fan coupling of many Mercedes engines from chassis W201, W124, etc. and can thus loosen or retighten the bolts without trouble. The tool also has a 1/2″ square drive that lets you unload belt tensioners of various engines to remove the ribbed belt.
Use
8 mm hex: M102, M103, M104
10 mm hex: M110, M116, M117, M119, M120, OM602, OM605, OM606, OM612, OM646, OM647, OM651
Many further useful tools are also available in our shop.


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