The daily working conditions of the engine often reflect the problems that the engine will have, and the timely maintenance of the engine can prolong the service life of the engine and ensure the efficiency of the truck. In addition to regular maintenance, card friends often need to observe the working conditions of the engine, to judge whether it needs to be overhauled, and the timely prediction can greatly improve the quality of the engine overhaul.

Correctly judge whether the engine needs to be overhauled

1, engine power significantly decreased, fuel consumption increased significantly.

The power and torque of the engine can be checked by the condition that the power and torque of the engine can be checked by the condition that the dynamometer can be judged by experience. When the throttle is placed in the maximum oil supply position, the maximum output power of the engine is only about 60% of the rated power, and the effect of the fuel system, the gas distribution mechanism and the transmission mechanism is not good after the maintenance and adjustment. When the fuel consumption of 100 kilometers is obviously increased, the cause should be identified. For example, if the engine of Baotou Bei Ben heavy duty engine wears seriously, it is necessary to consider whether there is a need for overhaul.

2, cooling water temperature at about 60 degrees is still difficult to start or unable to start.

The comprehensive index of the technical state of the compression system is reduced. If the cylinder pressure gauge is used, the compression pressure of the cylinder is less than 60% of the standard value of the original machine.

3. When the engine is running, there are more serious knocks in the body.

4. The oil consumption rate increases, the oil pressure is too low, and the adjustment effect is not significant.

There is no external leakage of engine oil, the percentage of oil consumption relative to fuel consumption is 3.5% to 4.5%, or more than one times more than the required oil consumption, or the exhaust pipe of Baotou North running heavy steam fittings exhaust smoke, and a large number of exhaust fumes from the crankcase. Crankshaft journal wear exceeds the limit, roundness and cylindricity are out of tolerance.

5, the gap between the cylinder and the piston exceeds the limit value.

All manufacturers have stipulated the cylinder wear cylindricity error limit value, if one cylinder wear reaches the limit, the engine should be overhauled. For example, if the cylinder wear amount is not up to the limit, but the matching gap between the cylinder and piston reaches the limit value, new piston and piston ring of Baotou Bei Ben heavy duty truck should be replaced. For example, if the clearance between the cylinder and piston is not large, the engine will be replaced by a new piston ring.

6, accident damage, such as tile burning accident, and the engine is approaching overhaul, then the overhaul method should be adopted to restore the performance of the whole engine.