Pully Insert

Tensioner pulley insert


is corroded off into engine. How can I fix this? Went to replace it to notice it corroded off.
2010 Dodge Grand Caravan

Picture would help.

Added to the original post.

I predict you will need to remove the engine mount and raise or lower the engine as needed to have access to drill out the broken piece (that’s called a dowel) from the engine.

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I presume this is a serpentine belt tensioner. Once the problem is fixed, might be a good idea to replace the tensioner proactively with a new one every 5 years or so. Those belt tensioners take a lot of abuse, should probably be replaced as a normally wearing part, routine scheduled maintenance.