Elongated hole on conical coupling


While re-aligning engine to C-Drive, one hole was found elongated. As the part is not available, the Yanmar dealer proposes drilling new holes, which sounds reasonable, but it'd be nice to know if the consensus is that the part will remain strong enough/will continue to have enough metal to absorb whatever heat it is designed to absorb.

Also, what caused this? Thanks in advance,

SM2K N. 350 (2002)

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