Fuel Injection Pump 326-4634 10R-7661 Safe and Reliable

Fuel injection pump 326-4634 10R-7661 is suitable for CAT C4.2 engine, in addition, it is also suitable for model E311/312/313/314 /315/318/319D excavators, which is a high quality product with a wide range of use. In this article, we will introduce you to the potential causes and solutions when the fuel injection pump 326-4634 10R-7661 fails to supply fuel unevenly. I hope it will be helpful to you.

1. Fuel injection pump 326-4634 10R-7661 Causes of uneven fuel supply

①Uneven fuel supply caused by failure of machine parts. After long-term use of the car, due to the fuel injection pump drive coupling is loose or clearance is too large, the drive gear wear, side clearance increases, will also affect the uniformity of oil supply to each cylinder. High-pressure fuel line joints due to frequent vibration or tighten the leakage of insufficient tightening, as well as tightening force is too large Ambassador joints metal fall off and clogging of the fuel line, will also cause uneven oil supply to the cylinders. In addition, in the fuel injection pump and governor spring, which is more forceful, deformation is larger, higher frequency of work is the plunger spring, so the frequency of its fracture is also higher, the lighter the amount of fuel injection is reduced, the amount of fuel injected by the cylinder is not uniform, the interval between the cylinder injection time is too poor, the start of the injection time is delayed, or heavy fuel supply intermittent or even can not be supplied.

② Uneven fuel supply exists during commissioning. Fuel injection pump in the test bench debugging, the requirements of the cylinder in the rated speed of the fuel supply should be less than 3% unevenness. In the actual commissioning process, due to the test bench special injector and high-pressure fuel pipe length, shape and caliber, etc. can not be completely consistent with the original machine, coupled with the differences in commissioning techniques, fuel injection pump installed, the actual amount of oil sprayed into the cylinder is often greater than 30% unevenness.

2. Fuel injection pump 326-4634 10R-7661 uneven fuel supply adjustment method

① After installing the fuel injection pump, adjust the fuel supply time according to the specified standard, and remove the exhaust manifold in order to observe the working condition of each cylinder.

② start the diesel engine, idling idle 2 ~ 3 min, touch the cylinder exhaust port and injectors near the cylinder head, if a cylinder temperature is too high, it can be initially concluded that the cylinder oil supply is too much.

③ When the temperature exceeds 50 ℃, increase the throttle, let the engine run at rated speed, while checking the exhaust port smoke color, pay attention to the sound of the cylinder. If a cylinder of black smoke, indicating that the oil supply is too large to engineering machinery installed more 135 series of diesel engines, for example, the fuel injection pump can be adjusted to stop the direction of the lever pulled out, loosen the locking screw on the adjusting gear, take a thin iron bar inserted into the hole in the oil control sleeve, with a hammer, so that it is turned to the right, it can be reduced to reduce the amount of oil, and vice versa is increased. When a cylinder has a crisp knocking sound, and startup difficulties, indicating that the oil supply began too early; if a cylinder temperature is high, or even a flame spray, it may be too late to start the oil supply time. Such as 135 series diesel engine, each cylinder oil supply start time adjustment is determined by the position of the oil pump plunger. When the oil supply start time is too late, the timing adjustment nut and screw should be screwed out a little; the oil supply start time is too early, then tighten this screw a little.

④Check the oil supply advance angle. Generally available oil spill method to check the oil supply advance angle, that is, one end of the oil pump high-pressure oil pipe connector loosened, will connect the injector end of the connector removed, turn the oil pipe to the horizontal position, and then tighten the oil pump high-pressure oil pipe connector, the throttle is pulled to the maximum position, open the decompression rocking car until the high-pressure oil pipe outlet out of the diesel fuel a few drops until the time. Wipe off the diesel fuel at the outlet of the fuel pipe, and then slowly turn the flywheel. At the same time, pay attention to observe the oil level at the outlet of the high-pressure fuel pipe, and immediately stop turning the flywheel at the moment it starts to move upward. At this time, the engraved line on the body should be aligned between 16° and 20° in front of the upper stopping point of the flywheel. If the two in the alignment before the oil overflow, indicating that the oil supply advance angle is too large, the oil supply is too early; if more than before the oil overflow, indicating that the oil s