Hello Darryl.
Nice to hear you are finally having some fun with the fruit of all your labours.
Could the source of the engine compartment noise be an air flow issue rather than a mechanical/contact type issue. In other words could the sound be getting generated by the air moving around. past or over something like a bent shroud or object that is not quite in its correct location?
Could you try just removing the fan blade assembly to eliminate the air flow and see if the sound is still there. If it is still there, the lack of air movement might help better isolate exactly where the sound is coming from.
Best regards,
David
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