Inspecting A 1975 Harley-Davidson - Four-Speed Inspection
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11. With the sprocket removed, we were happy to see the L-key in place holding the seal sleeve to Fourth gear. This key is important to an oil-tight transmission. The seal sleeve and Fourth gear must turn together to maintain the transmission oil on the inside. If Fourth gear turns inside the sleeve, it is metal-to-metal contact. Metal-to-metal wears very quickly, letting the oil leak by and out onto your garage floor. View Related Article
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