Knock like sound from engine

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Easy quick way to check is to take a steel tube, around 1/2" to 1-1/2"(if you have something laying around) and touch it to the motor in different areas. You hold it to your ear and listen to where it's the loudest. O'Reilly has a fairly cheap tool for this that is a stethoscope with a rod attached to it. You can pinpoint where the sound is coming from.

Could be a ton of different things. Try to use a tube or stethoscope tool and just touch it around different areas and find where it is the loudest.

Have you checked the valve lash recently? These motors are known to have some sewing machine like noises.
 

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