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Hi, guys!

I'm trying to replace gy6 50cc crankshaft oil seal (engine side), but I faced a problem
I've made a tool (30 mm diameter and 1 mm thickness metal tube with washer). I wanted to use this tool to evenly press the seal into the seat using the pulley nut. But when I've tried to press in seal the inner lip and the spring turned to the other side... I don't know why it happened... I know that other people are using this technique successfully... Before pressing the seal I've applied a thin layer of RTV sealant around the outer edge and a thin layer of lithium grease on the inner edge and back of the seal...

Do you have any ideas why it happened? Is the tube wall too thin or what's the problem? 🙂

Here are some photos of the case drive.google.com/drive/folders/1AiU053ScvG2EERv01gkA8iGbusOL4x_7?usp=drive_link