Made in China Top Quality Diesel Fuel Injection Pump BH4QT90R9 Engine Elements

Diesel oil pump as a diesel engine fuel supply system core components, its performance directly affects the engine power output, fuel economy and emission levels. Therefore, in-depth study of the structure of the diesel oil pump principle, common failures and maintenance methods have important practical significance.

Diesel oil pump is mainly composed of pump body, plunger, oil valve, inlet valve, camshaft and other components. Its working principle is based on the reciprocating motion of the plunger, when the camshaft rotates, it pushes the plunger to do up and down reciprocating motion in the pump body. Plunger downstream, the inlet valve open, diesel into the pump cavity; plunger upstream, the inlet valve closed, the diesel fuel in the pump cavity is compressed, the pressure rises, when the pressure reaches the opening pressure of the outlet valve, the outlet valve opens, the high-pressure diesel fuel is transported to the injector nozzle, sprayed into the cylinder combustion.

Pump oil pressure is insufficient
Plunger wear: long-term use of the plunger and the pump body lead to increased clearance between the fit, sealing down, so that the pump oil pressure.
Poor sealing of the outlet valve: the outlet valve is worn or the sealing cone has impurities, resulting in poor sealing performance, high-pressure oil leakage and pressure drop.

Uneven oil supply
Inconsistent elasticity of the plunger spring: the difference in elasticity of the plunger spring will make the plunger move in a different way, resulting in uneven oil supply.
Loosening of the adjusting gear ring: the adjusting gear ring is not fixed securely and is displaced during the working process, which changes the effective stroke of the plunger, resulting in uneven oil supply.

Oil pump bite
Poor diesel cleanliness: diesel with more impurities into the pump chamber, exacerbating the wear and tear of the components, which will lead to serious plunger, pump body and other components seized.
Poor lubrication: the oil pump internal lubrication system failure, so that the friction between the plunger and the pump body increases, ultimately causing the oil pump bite.

Pump oil pressure is insufficient maintenance
For the plunger wear, according to the degree of wear and tear, choose to repair or replace the plunger and plunger sleeve, to restore its matching accuracy, to ensure the sealing.
In case of poor sealing of the outlet valve, the sealing cone surface of the outlet valve should be ground or replaced with a new outlet valve to ensure good sealing.

Maintenance of uneven oil supply
When the spring elasticity of the plunger is inconsistent, a set of springs with the same elasticity should be replaced to ensure the synchronization of the movement of each plunger.
If the adjusting ring is loose, it is necessary to re-fix and calibrate the position of the adjusting ring, so that the oil supply of each plunger is even.

Maintenance of oil pump biting
First of all, the internal oil pump should be thoroughly cleaned to remove impurities, and check the diesel fuel filter to ensure that the diesel fuel is clean.
Repair or replace the damaged lubrication parts to ensure good lubrication of the oil pump and prevent it from biting again.

The normal operation of the diesel oil pump is the key to the stable operation of the diesel engine. Through an in-depth understanding of its structural principles, accurately determine common failures and take effective maintenance strategies, can significantly improve the reliability and service life of the diesel oil pump, reduce the equipment failure rate for the efficient operation of diesel engines to provide a strong guarantee, but also help to reduce energy consumption and environmental pollution, with important economic and social benefits. In practical application, should strengthen the diesel oil pump routine maintenance and regular maintenance, timely detection and solution of potential problems, to ensure that it is always in good working condition.