How to maintain the bus engine?


Hello, freinds, The engine is an important part of the bus, do you know how to maintain the engine?


  1. Inspection and maintenance of the intake and exhaust system


  • Check whether the intake bellows has cracks, aging, and whether the clamps at both ends are firm;

  • Whether the air inlet and outlet hoses of the intercooler have cracks, aging, and whether the clamps are firm;

  • The sealing performance of the compressor end and the turbine end of the turbocharger;

  • Whether the response of the exhaust brake valve is flexible and effective;

  • The sealing performance of the intake and exhaust manifold ends.

  • Check and clean the outer filter element of the air cleaner every 10,000km (4,000km in dusty areas).

  • Check whether the wiring of the air filter clogging alarm sensor is firm.

  • It is strictly forbidden to remove the air filter when the car is running or the engine is working.Otherwise it will cause the early wear of the engine or the failure of the cylinder.

Note: If there is any in the intake line? Air leakage will cause a large amount of unfiltered air to enter the intake manifold. and the engine will wear at an early stage. If there is air leakage in the exhaust pipeline, it will cause a loss of compressed air power, a reduction in the boosting effect, and a reduction in engine power. .


  1. Inspection and maintenance of oil supply system


  • The screw plug should be unscrewed every week to drain water.The precipitator water cup should be taken out every 4000km maintenance. The water and impurities should be poured out.The water cup, cover and diffusion cone should be cleaned. When re-installing, be careful not to miss or install the partial sealing ring to avoid oil leakage.

  • Check the ventilation holes on the fuel tank to ensure normal ventilation. Once the ventilation holes are blocked, the pumping efficiency of the fuel pump will be reduced;

  • Check that there should be no dripping phenomenon in the whole pipeline;

  • When replacing the oil pipe, the general rubber hose should not be used, and the sub-large pipe with certain strength and oil resistance must be used. Because when the temperature is high or the oil suction pressure is high, the hose will be deflated and the oil supply will be interrupted.

  • Check the response flexibility of the throttle cable, remember that when the throttle cable does not respond smoothly. You should troubleshoot or replace the throttle cable.

Note: The high-pressure oil pump is the heart of the engine. Please be sure to maintain the high-pressure oil pump and injector on time. In most cases, engine power drop, difficult to start, unstable idle speed, environmental protection does not meet the requirements. And high fuel consumption is related to the high-pressure fuel pump and fuel injector.


  1. Inspection and maintenance of lubrication system


  • Oil pressure, the indication of the oil gauge: the idle oil pressure is about 0.7 to 1.0, and the high pressure does not exceed 3.5.

  • The quantity and quality of engine oil; diligently check the quantity and quality of engine oil.


We are professional supplier of Daewoo bus parts, welcome to discuss with me if you have any questions.



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