X2 on listening to where the sound comes from.
When the Air Filter Bracket/Air Filter Housing is loose or broken it sounds like something is going to come off of the Engine.
I had a rattling sound in the front of the Valve Cover and it turned out the small upper Timing Chain Guide (#89 in the pic) was loose. Tightend the Bolt up and no more issues for over 4 years.
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84 300D, 82 Volvo 244Gl Diesel
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