Is Disassembling the Engine Considered a Major Overhaul?
2 Answers
Disassembling the engine is considered a major overhaul. Below are the related introductions to major overhaul types: Engine: Replacing the main internal components of the engine. This mainly includes the crankshaft, pistons, connecting rods, cylinder liners, valve components, piston rings, piston connecting rods, valve seat rings, crankshaft connecting rods, piston rings, timing belt (some vehicles use a timing chain and do not require replacement), engine overhaul kit, crankshaft rear oil seal, transmission front oil seal, cleaning the engine water passages, cleaning the radiator, and replacing the engine oil and filter. Transmission: Replacing the main internal components of the transmission, such as gears, gear oil pumps, bearings, seals, locking pins, etc. Frame: A frame major overhaul is only necessary when there is a collision or the frame breaks due to age. Generally, the frame needs to be placed on a frame correction platform for alignment.
I've been repairing cars for ten years, and removing the engine doesn't necessarily mean a major overhaul. It depends on the extent of the work. If you only remove the entire engine to replace the clutch plate or repair the transmission interface, and the engine itself isn't disassembled, it doesn't count as a major overhaul. A real major overhaul involves opening up core components like the cylinder head, oil pan, and piston connecting rods—it's like performing major surgery on the engine. Last time, a car owner got scared when the mechanic mentioned removing the engine, but it was just to replace the turbocharger's exhaust pipe. I recommend asking the mechanic to provide a detailed list of the repair scope before starting, so you know what to expect. Also, pay attention to the water temperature while driving—don't let it exceed the red line—and change the engine oil regularly. This way, the engine is less likely to develop issues requiring a major overhaul.
