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This bolt should be replaced when you are replacing your crankshaft pulley.
This bolt is included in our timing belt kits as they are prone to loosening off - and replacing the bolt seems to reduce the likelihood of this happening.
A loose crankshaft pulley bolt almost always means they pulley will rotate back and forth on the crankshaft and wear out the keyway - which may mean an annoyingly costly repair or the need of replacing the crankshaft.
Toyota - Japan