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The engine has no idle speed diagnosis and processing

2017-3-28 15:46:37

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The engine without idle speed, the general performance of the throttle placed in the idle position on the flame, when the throttle slightly larger, the speed quickly increased, can not be stable at low speed operation.

1) reason

(1) governor idling spring is too soft or broken.

(2) the governor sensor element wear is too large.

(3) fuel pump plunger wear serious.

(4) the temperature is too low.

(5) Cylinder pressure is too low.

2) diagnosis and treatment methods

(1) cold start without idling, the general is a normal phenomenon. This is due to the temperature is too low, the oil viscosity is too large, so that the engine resistance increases, diesel spray, evaporation conditions deteriorate, resulting in the engine can not maintain the minimum stable speed operation, when the throttle, it will soon turn off. In this case, the throttle can be transferred to slightly higher than the idle operation, until the engine temperature, and then resume idle operation.

(2) If the engine has been used for a long time, no idle conditions, and with the lack of power, fuel consumption is not normal, generally due to plunger wear too much, the increase in oil leakage when idle, so that fuel supply can not meet the idle conditions, Or cylinder pressure is too low, fuel injection advance angle is too large, too small, so that the engine combustion conditions caused by poor. As long as the failure to deal with the lack of power, idle conditions will naturally resume.

(3) If the above situation is normal, you should consider the governor of the idle work components with or without exception. Check the governor spring with or without broken, or the speed of the component wear too much or the spring is too soft, so that the flying hammer in the idle operation of the centrifugal force is far greater than the spring tension and oil, or maintenance personnel to adjust properly. You must remove the fuel injection pump assembly on the test bench to re-maintenance adjustment. Check the governor, the first should be adjusted by idle screw, if the adjustment is invalid, and then idle spring preload tension adjustment. The idle spring can be adjusted to the screw slightly screw or in the spring seat on the gasket, so that the preload force increases, increase the idle speed. If the spring is broken, it should be replaced and then adjusted to restore the idle performance.
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