Thailand Rejects Chinese Proposal To Build $390 Million Submarine With Underperforming And Noisy Chinese-made CHD620 Diesel Engine GDC 1 year ago A Type 093A Yuan-class submarine build with the Chinese-made CHD620 engine as an alternative to the MTU engine proved under-performing and noisy, according to Thai Navy. You need to be logged in to view this content. Please Log In. Not a Member? Join Us