Automobile engine overhaul mainly includes the replacement of valves, pistons, cylinder liners, or cylinders, grinding shafts, etc. According to the standard of general 4S stores, they need to be replaced with 4 supporting devices, that is, pistons, piston rings, valves, valve oil seals, valve guides, crankshaft shingles, connecting rod shingles, timing belts, tensioning wheels.
If the chain is timed, it is necessary to change the timing chain, tensioner, in addition to machining, cylinder sleeve, grinding shaft, cold pressure conduit, but also need to replace the overhaul package, curved front oil seal, curved back oil seal, camshaft oil seal, oil pump, more research valve, etc., sometimes also need to replace external accessories such as clutch disc, etc. In short, it is necessary to replace the parts that are not sure to repair the engine to ensure the performance of the engine.
