Fuel Injection Pumps 317-8021 2641A312 10R-7660 292-3751 High Working Efficiency

In the use of Fuel injection pumps 317-8021 2641A312 10R-7660 292-3751, a variety of unexpected failures will occur, to understand the relevant knowledge, can help us effectively solve the problem, this article will introduce you to Fuel injection pumps 317-8021  2641A312 10R-7660 292-3751 appear air exhaustion and outlet valve wear caused by the injection nozzle dripping problem causes and solutions, the following is the specific content.

1. Fuel injection pump air can not be exhausted

Fuel injection pump oil pressure is insufficient, the inner cavity air resistance is difficult to circulate, after parking, there is air into the pump body. These phenomena are mainly fuel system air resistance reasons, in addition to the various sealing gasket uneven air leakage, there are several reasons:

(1) fuel pump check valve sealing is poor. The use of nylon materials made of check valves, because of mechanical impurities in the fuel so that the check valve wear, burrs, produced by the skew and sealing with the valve seat fit is not tight, or into the oil screw in the oil filter screen is clogged with dirt, etc., resulting in insufficient oil pressure and lead to the inhalation of air.

Elimination method: remove the hand pump, finger compression check valve spring 1 mm (flush with the check valve seat hole surface), when not pressing the hand pump, the oil level should be smooth. Otherwise, the check valve and seat seal is not tight. The check valve in the waste of fine grinding wheel on the coarse grinding a few times, and then placed on the flat plate, with grinding paste according to the “S” shape gently grinding, and then with polishing paste and valve seat research and matching. Note: After grinding, be sure to clean the abrasive paste. When there is a scratch on the valve seat of the oil transfer pump, apply a small amount of abrasive paste or chromium oxide powder on the valve seat surface, insert the special tool into the valve seat hole to locate it, and then rotate and research it by hand, and when the scratch is serious, it should be processed on the milling machine with an end milling cutter, and then grind it according to the above method.

(2) Excessive wear between the piston of the hand fuel pump and the pump body, and the rubber seals are aging and expanding and failing. Fuel pump work, air from the upper end of the hand oil pump body into the fuel injection pump.

Elimination method: hand oil pump seal aging, damage, should be replaced with new parts. In addition, after exhausting air with the hand fuel pump, be sure to tighten the nut on the hand fuel pump.

(3) fuel injection pump body into the return hole screw mess buckle damage or install the opposite, the seal is not tight and enter the air.

Elimination method: into the oil screw hole buckle, should increase the screw hole processing, increase must be fine pitch; bleed screw damage, available ordinary screw on one side saw a slanting groove in lieu of.

(4) The steel ball in the oil return screw is worn and the spring pressure is insufficient, the steel ball and the valve seat seal is not tight, causing insufficient fuel pressure.

Remedy: When the oil return screw is not sealed tightly, use a straight rod to insert into the oil return screw hole, and hit the steel ball with a hammer to increase the sealing fit with the seat hole.

2. Wear and tear of the oil outlet valve leads to oil dripping from the injection nozzle

The harm of oil injector drip is to lead to the continuation of oil injection, uneven oil volume, poor start-up, work knocking, exhaust smoke, increased carbon, power decline, fuel consumption, wear and tear. In addition to the nozzle itself, there are other reasons, that is, the high pressure fuel pipe residual pressure (that is, the high pressure fuel pipe in the nozzle between the two injections when the pressure is not spraying), the higher the residual pressure, the more serious the nozzle dripping, and affect the residual pressure is the main reason for the fuel injection pump outlet valve coupling. The outlet valve coupling is a one-way valve. When its decompression ring belt wear, decompression effect decreases, the high pressure fuel pipe residual pressure rises, generally to 3 ~ 5 MPa, decompression ring belt wear is serious to reach the end of life, generally will rise to 5 ~ 7 MPa.

Outlet valve coupling sealing test should be carried out in the injector tester, multi-cylinder engine individual cylinder injector nozzle oil droplets fault, can be used to replace the method of comparison. To be “faulty cylinder” injection nozzle on the “normal cylinder” fuel injection pump sub-pump, such as still dripping oil, indicating that the fault in the injection nozzle; such as not dripping oil, indicating that the fault in the fuel injection pump.

If you want to know more about fuel injection pumps 317-8021 2641A312 10R-7660 292-3751, please feel free to contact us, Keluo Construction Machinery will provide you with durable, reliable and easy-to-install fuel injection pumps.