Automobile engine overhaul mainly includes replacing valves, pistons, cylinder liners, or boring cylinders, grinding shafts, etc. According to the standard of general 4S stores, 4 components need to be replaced, that is, pistons, piston rings, valves, valve oil seals, valve guides, crankshaft bushes, connecting rod bushes, timing belts, and tensioners.
1. What projects should be overhauled?
1. If the timing of the chain is required, the timing chain and tensioner must be replaced. In addition, machining, boring cylinder lower sleeve, grinding shaft, cold press pipe, and overhaul kit need to be replaced. Front oil seal, rear oil seal, camshaft oil seal, oil pump, valve, etc. Sometimes it is necessary to replace external parts, such as clutch plates, etc. In short, it is necessary to replace all the parts that are not sure to be installed. Repairing the engine ensures the engine's performance.
2. The mechanical part generally includes a set of intake and exhaust valves, a set of piston rings, a set of 4 cylinder liners (if it is a 4-cylinder engine), two thrust plates, and 4 pistons. ;
3. The cooling system generally mainly includes the water pump (the pump blades are corroded or the water seal has water seepage), the upper and lower water pipes of the engine, large circulation iron water pipes, small circulation hoses, and throttle water pipes (with aging problems). (If it expands, it must be replaced), thermostat, etc.;
The fuel part generally includes the upper and lower oil rings of the injector, the gasoline filter; the ignition part: if the high-voltage line is swollen or leaking, replace it, and the fire Piston; upper and lower oil rings of fuel injection nozzle, gasoline filter;
4. Ignition part: Replace the high-voltage line if it is swollen or leaking, and the piston is on fire;
5. Air intake Part generally includes air filters;
6. Other auxiliary materials generally include antifreeze, engine oil, engine oil filter, detergent, engine metal cleaner or all-purpose water;
7. The components to be inspected generally include whether the cylinder head is corroded or uneven, crankshaft, camshaft, timing belt tensioner pulley, timing belt adjustment pulley, timing belt, external engine belt and adjustment pulley, rocker arm or rocker arm Axis, if it is a hydraulic lifter, please check the hydraulic lifter;
8. Cooling system part: water pump (pump blades are corroded or water seal has leakage), engine upper and lower water pipes, large circulation iron pipes, Small circulation hose, throttle water pipe (must be replaced if aged and swollen);
9. Fuel part: The overhaul kit includes cylinder gaskets and various oil seals, valve chamber cover gaskets, valve oil seals, etc. Gaskets and other things;
Engine overhaul projects generally include overhauling the engine, machining the cylinder head plane, boring the cylinder, clearing the water tank, grinding the valve, inserting the cylinder liner, pressing the piston, cleaning the oil circuit, Maintain motors, maintain generators, etc.
2. Parts that need to be replaced when overhauling the engine
1. Valve oil seal package, one set of intake and exhaust valves, one set of plug rings, and one set of cylinder liner with 4 push pieces Two pieces, large and small tiles, 4 plugs,
2. The cooling system generally mainly includes the water pump (the pump blades are corroded or the water seal has no leakage)
3. The upper and lower water pipes of the engine ,bigCirculating iron water pipes, small circulating rubber hoses, and valve water pipes (must be replaced if they are not aging or shrinking);
4. The fuel part generally includes the upper and lower oil rings of the injector, and the gasoline filter;
5. The ignition part generally mainly includes whether the high-voltage line has no shrinkage or leakage. Otherwise, replace the spark plug. The air intake part generally mainly includes the air filter.
6. Other auxiliary materials: antifreeze fluid, engine oil; whether the cylinder head is corroded or uneven, crankshaft, camshaft, reverse timing belt tensioner, reverse timing belt zeroing pulley, reverse timing belt, external engine belt and zeroing pulley, rocker arm or rocker arm shaft, If it is a hydraulic lifter, please check the hydraulic lifter more. The overhaul kit includes cylinder gaskets and various oil seals, valve cover gaskets, valve oil seals, gaskets, etc.