84 300D. Just did the valve adjustment, everything runs fine, shifts fine, no power loss, no leaks noticeable. Except I can hear the Turbo spooling up and down from the cab. Whining like my old Cummins. Turbo to air cleaner connections verified tight, no loose hoses that i can see. When I go under the hood and spool it up, the whine is coming directly from the intake scoop opening, forward of the air cleaner housing. Never heard it before that I remember.... Any ideas?

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1984 300D Turbo