Re: need help with knocking noise
This is not strictly correct.
You can spin a rod bearing without damaging the crank at all if you catch it quickly enough.
If the bearing clearance has opened up enough to hear the knocking then it's likely the crank is damaged but there are several repair options before you need to replace the crank.
Regardless of how you fix it you must measure up the oil clearances during reassembly.
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