The metal part that connects the piston to the crankshaft is called a “connecting rod.” RAY: When you “throw a rod,” it means that one of these rods has literally broken off. If the rod breaks while the piston is on its way up, the piston keeps going up until it jams itself permanently into the cylinder head.Click to see full answer. Also to know is, can a thrown rod be fixed?A thrown rod means a portion of the rod is being thrown around inside the engine. In almost every case, if you’ve thrown a rod, complete engine replacement (at a minimum, most likely a shortblock) is needed to fix your issues.Beside above, what causes a rod to break in an engine? Thrown rods or piston rod breaks happen due to oil problems, over-revving the engine, faulty piston bearings or normal wear and tear. Over-revving the engine can lead to rod breaks. The revving causes rod failure due to a valve’s spring failing or being sucked into the engine. Similarly, how much does it cost to fix a rod knock? An average connecting rod repair will cost anywhere from $2,500 and up. On some vehicles like a Subaru Forester, that can run $5,000 between parts and labor for an engine rebuild or beyond $6,000 for a whole new engine replacement.What does a bad rod bearing sound like?A failed rod bearing will end up producing a metallic knocking or rumbling noise from the engine, especially during cold starts. This is known as ‘rod knock’, and it sounds like striking a tin or aluminum surface, which is low at idle and increases in degree with acceleration.