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@lynx
If its an old bike i'm guessing at a quill style stem. The headset is probably dry with some damaged balls, I'd take the heast set apart clean the races up and replace the bearing with loose ball bearings if the races are heavily pitted I would put slightly larger ball bearings in to cover up the issue(minimum grade 100) and re assemble with fresh grease. Think the standard bearings size is 3/16 and if you go up to 4mm should be enough to cover any issues.