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It could be anything but if you see some oil at the bottom of the cover it's doubtful that you'll find anything to repair without removing the t-belt.
A small puddle means different things to different people. Small = silver dollar? Trash can lid? A dime? The smell may be the oil blowing back and burning on the hot exhaust, not necessarily from a belt. Doesn't hurt to check both out. If I had to guess I'd say it's probably time for a t-belt, cam and crank seals. It's better to let someone that knows look though.
Beav
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