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Today i'm just checking for any leaks on my corolla and i notice something wired about the release nut of the belt tensioner which is some material chipped off as shown on the photo, i don't how it happened and also Does it need to worry about it?
My concern is when i'm going to change the drive belt in the future, the nut will snap off

Engine: 3ZZ-FE
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My guess would be someone doing work down in the engine probably hit it with a wrench or ratchet or something on the way in or out or both. Probably not on purpose, likely just trying to shove a tool down there. Or they had a socket/wrench on that nut but didn't have it on all the way when they tried to loosen it.
 

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マズダスピード3
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You’re fine as long as the nut doesn’t break off. When you replace the belt tensioner, you’ll get a new cast one. Best to use a 6 point socket.
 
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