The standard JP4 clutch and flywheel are for 200mm clutches, not 180mm.
180mm is for 1.1/1.4 and 1.4D/1.5D.
180 and 200mm clutches have different release bearing types.
My best guess, is that you're using the wrong release bearing for your clutch type OR as pointed out on of the small plastic clips have broken and it's not quite centered.
Unless of course it's random input shaft noise that just happens to be making noise now.
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