活塞環為什麼要這樣裝【什麼是活塞側向推力】Piston ring installation method白同學2代勁戰翻新EP52

如何測量活塞方向【四行程必修課程】How to measure the piston direction EP50 https://www.youtube.com/watch?v=d5iN4pNvHS8 活塞環上下要如何區分【你知道嗎?】How to distinguish up and down piston rings EP51 https://www.youtube.com/watch?v=YOVB-f41dak