Fuel Injection Pump 3975701/4941066/4988593/0445020122/0445020043 Foton Isf3.8 Engine Parts

Maintenance methods of diesel engine fuel injection pump

(5) Check the camshaft clearance regularly
The axial clearance of the camshaft of the fuel injection pump is very strict, generally between 0.03 and 0.15mm. If the clearance is too large, the impact of the roller transmission parts on the working surface of the cam will be aggravated, thereby increasing the early wear of the cam surface and changing the Oil supply advance angle; excessive axial and radial clearances of camshaft bearings may easily cause the camshaft to run unsteadily, the oil quantity adjustment rod to vibrate, and the oil supply quantity to change periodically, making the diesel engine run unstable. Therefore, it is necessary to check regularly and Adjustment. When the axial clearance of the camshaft is too large, it can be adjusted by adding shims on both sides; when the radial clearance is too large, it is generally necessary to replace it with a new one.

(6) Regularly check the sealing condition of the oil outlet valve assembly on the machine
After the fuel injection pump has been working for a period of time, a rough judgment can be made on the wear of the plunger and the working condition of the fuel pump by checking the sealing condition of the fuel outlet valve, which is beneficial to determine the repair and maintenance methods. During the inspection, unscrew the high-pressure oil pipe joints of each cylinder, and pump oil with the hand oil pump of the oil delivery pump. If there is oil flowing out of the oil pipe joints on the top of the fuel injection pump, it means that the oil outlet valve is not well sealed (of course, it will also be damaged when the oil outlet valve spring is broken. this circumstance occurs). If there is poor sealing of multiple cylinders, the fuel injection pump should be thoroughly debugged and maintained, and the even parts should be replaced.