Right. These two chains are located on the back side of the engine. So if engine sounds diesel when idling the first thing is to chech the sound of back top side of cylinder head, not the front side where all pulles and belts are.
If these are chains, than it's almost 100% low oil pressure at idling. Warning lamp still doesn't come on, but it is enough to hear the rattling sound. Can be further diagnosed by measuring oil pressure at idling by connecting manometer.
Subframe out, engine sump out, and check if oil pump is clogged with debris. If not, then change oil pump (plug and play operation).
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I'd rather drive on left
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