Skip to main content

Archive

Show more

Maintain and Repair Diesel Generator Oil Pump



The oil delivery pump of diesel generator set is single acting piston type. It is mounted o n the side of the fuel injection pump of the diesel generator set and is driven by an eccentric wheel on the injection pump shaft. Its function is to inhale fuel from the tank and supply enough fuel to the diesel generator injection pump with a certain pressure. Before starting the diesel generator set, pump the oil with the hand pump on the oil pump and remove the air from the oil circuit. It can smoothly absorb the fuel within 1 m below the center of the pump in 0.5min. The handle nut must be fastened after the pump oil.


The 4 and 6 cylinder B series and B series enhanced fuel injection pumps use roller pumps, as shown in figure 2a. The 12-cylinder B series fuel injection pump is equipped with two rolling wheels, the oil pump on the left and right sides of the inlet and outlet oil pipe joint and a hand pump mounted separately on the front end of the diesel engine block, as shown in figure 2b/c/d.

The matching clearance between the piston and the housing of the oil pump of genset is 0.005-0.02 mm. If the gap is too large, the fuel supply rate will decrease. The jacking rod and the jacking sleeve of the rolling wheel oil pump are also paired and the gap is too large and there are also the disadvantages of oil leakage. Hand pump piston and hand pump body between the rubber sealing device, unless the rubber ring in the hand pump damage, generally should not be removed. The 12 cylinder V diesel generator has no rubber seal for the hand pump. It is sealed by matching clearance (not greater than 0.02mm).

The working principle of the oil pump is shown in figure 3. when the roller and the ejector rod of the oil pump are in the lowest position of the eccentric wheel of the fuel injection pump, the fuel in the upper chamber of the piston is squeezed out because the piston is driven upward by the action of the spring. Then the one-way valve on the oil outlet side closes and the fuel is sent to the fuel filter, and a space is formed in the lower chamber of the piston. The one-way valve on the oil inlet side is opened to absorb the fuel, as shown in figure 3a. the cycle is constant, the fuel is inhaled and discharged. When the oil pipeline resistance is increased to the same oil pressure at both ends of the piston, the piston is no longer in balance with the rod movement, and the oil pump stops working.

Oil pump maintenance

Oil pump is an important component in diesel generator to support combustion power generation. Once failure occurs, it will lead to problems such as coke deposition, insufficient combustion, blocking and so on. So it reminds genset users to pay attention to the maintenance of oil pump is also an important task.


1. Before installing the oil pump, check whether the type and specifications are correct. The thickness of the gasket should be suitable to prevent the piston from dying or running out of place because it is too thin or too thick. Tighten the bolt when the toque to be uniform, to prevent damage to the oil pump.

2. There is rubber seal between the piston and the body of the hand oil pump in the oil pump. Do not remove it at will. The rubber ring should be replaced in time if it is damaged.

3. The coarse screen core in the connection of oil pump is easy to be clogged by dirt such as cotton flor, so it must be checked and cleaned


4. The hand oil pump must be pressed back to tighten the button to prevent air intake or oil leakage caused by the pressure off the pump and rubber ring or between the ball valve and the valve seat.


The parts should be inspected after long time use of the pump of the diesel generator set. The points for attention are as follows.



1. If the plane of the one-way valve is worn, sunken and pockmarked, the grinding paste shall be used to grind on the flat plate. As the following figure, serious should be replaced.

2. The surface of the one-way seat on the shell should be replaced when worn seriously or unevenly.

3. The wear between the top rod and the top rod sleeve is so serious that the clearance increases, the seal becomes worse and the diesel oil leak is too serious, it must be replaced together with the shell. Optionally increase the size of the rod, but with the shell replacement, or with the size of the rod, subject to mutual research.

4. The coarse filter core in the oil inlet joint is easy to be blocked by cotton wadding, which affects the oil supply. Therefore, it is necessary to pay attention to the cleaning of fuel and the removal of dirt on the filter core.

5. When the rubber ring of the piston pump is damaged, it should be replaced in time. The leakage of the piston of the hand pump used in the 12 cylinder V diesel generator set indicates that the matching surface is worn and the clearance is enlarged, which needs to be rescheduled.


Generator parts such as piston for oil conveyance in diesel generator set after reassembly. In the whole process should be good activity, no block and stuck phenomenon, pressure pump should be light and flexible. The one-way valve spring must be accurately embedded in the spring slot when installing the one-way valve spring.


Comments

Popular posts from this blog

New Yuchai engine YC6K600-D30 power for diesel generator 50Hz

Yuchai Is Super Confident in Its Innovation

Founded in 1951, with 30 wholly-owned, holding and joint-stock subsidiaries, Guangxi Yuchai Machinery Group Co., Ltd. (hereinafter referred to as the Yuchai Group) is an internal combustion engine manufacturing base with the most complete spectrum of products in the country. In recent years, machinery manufacturing industry has been dropped off influenced by domestic and foreign economic situations, especially domestic overcapacity and unreasonable product structure. Reversely, Yuchai has sold over 3 million engines with the annualized revenues amount to RMB 40 billion. Over the years, as China ’ s largest engine R&D manufacturing base, Yuchai adjusts and optimizes its industrial structure and constantly strengthens its capacity for independent innovation. Therefore, the key technology continues to be the top in the sector for further keeping its own top leader in the industry. Innovation-Driven In 2013, seven world-class diesel-engine products for high-s...

Technical Parameters of Boduan 500KW Weichai Generator Set 6M33D572E200

  The 6M33D633E200 diesel engine is a special-purpose diesel engine for land-based power generation in the M33 series. It is a new-structure power generation diesel engine with a centrally - located turbocharger developed by Weichai Power Co., Ltd. in 2016. Continuous Power (COP): The maximum power at which the diesel engine can run continuously under a constant load with no limit on the annual operating hours. It is the ISO standard power. Prime Power (PRP): The maximum power at which the diesel engine can run continuously under variable loads with no limit on the annual operating hours. It is an ISO standard power that allows a 10% overload. Standby Power (ESP): The maximum power in a certain variable - power series that the diesel engine can operate for up to 200 hours per year. It is an ISO standard power with limited fuel consumption.   Operating Conditions and Applications of Baudouin  500KW Weichai Generator Set  Diesel Engine Power Classification Operating Co...