12157-10010 GASKET, DRAIN PLUG – CRUSH WASHER – TOYOTA LAND CRUISER
The 12157-10010 GASKET, DRAIN PLUG – CRUSH WASHER is used in conjunction with the 90341-18051 PLUG, SUB-ASSY that uses a 10mm Hex Socket that is in-set into the plug, thus protected vs the traditional “bolt-style” drain plug.
When the drain bolt is tightened onto the pan, care must be taken to avoid over-torquing of the bolt as this may cause the pan to become cracked. The crush washer provides a margin of safety in that the crush washer is designed to deform when a torque sufficient to prevent leaking has been applied to the bolt. The deforming of the crush washer allows the bolt to be over-torqued a slight amount before damage to the pan occurs. There are instances, however, when the deformation of the crush washer may go unnoticed. In such instances, if torque continues to be applied to the bolt, then this margin of safety is overcome and the pan may become damaged and/or leak.