Can you replace engine pistons rings without removing the engine?

It is technically possible to replace engine piston rings without removing the engine from the vehicle, but it is generally not recommended. To replace piston rings, the engine's cylinder head must be removed, which requires a significant amount of disassembly. Additionally, accessing the pistons and rings usually requires removing the oil pan and possibly the connecting rods. Attempting to replace piston rings without removing the engine can be challenging and time-consuming, and may result in damage to other engine components. It is also difficult to ensure that the new piston rings are properly seated and sealing against the cylinder walls without fully disassembling the engine. For these reasons, it is typically more efficient and effective to remove the engine and perform a full rebuild or overhaul if piston ring replacement is required.