Classic Car Quick Fix: Straightening a dented oil pan
Now and then a driver tries a shortcut through a field or over a high curb and winds up with a pushed-in oil pan. The dent is usually in the area of the drain plug, since this is located at the low point of the pan. The pan not be pushed up far enough to contact the rod caps or crankshaft counterbalances, but the dent prevents a complete draining of the old oil when it comes time for an oil change.
There's an easy way to remove the dent without dropping the pan. Weld to the head of the drain plug a metal ring through which a bar will pass. A discarded retainer ring from an axle shaft is fine for the purpose. Install the drain plug in the pan, slip a bar through the ring, and pry down as needed.
Steel ring is welded to drain plug to straighten pushed-in oil pan.