Fuel injection pump is the heart of fuel supply system of diesel engine”. Injection pump precision parts even card lag, will cause the engine speed is not stable, serious will lead to engine flameout and car accident.
The reason of stagnation of injection pump
The old fuel pump, which causes stagnation card for diesel is not clean, there are mechanical impurities between the plunger and the plunger, and the plunger and the plunger sleeve surface is pulled, or plunger bump top corner being generated by burr.
For Baotou North rush heavy truck parts, the new fuel injection pump, its stagnation reasons are the following:
At present, some fuel injection pump manufacturers and maintenance units in the commissioning of fuel injection pump, do not pay attention to the use of high-quality diesel, resulting in debugging of diesel oil in the actual glial content greater, higher acidity. After debugging, a residual oil film is adhered on the matching surface of the precise matching parts of the fuel injection pump. If the oil pump is stored for too long, this layer will gradually produce organic sediment and glue. After the machine is installed, it will produce hysteresis.
Injection pump storage poor storage, packaging is not strict, moisture-proof, rust resistant material leakage or damage, oil pipe joint dust cap damage or loss, etc., will also produce stuck phenomenon.
Card lag processing
For the old fuel injection pump, it can be found to be blocked plunger parts, and removed, cleaned with clean diesel. If the plunger is broken by mechanical impurities, clean oil can be used to wash and grind. If the plunger top is knocking burrs, when the plunger plunger sleeve top indentation would send acerbity hairpin, must not be repeated rotation or tic plunger, the plunger sleeve to avoid burr scratch. The correct way to deal with this problem is to pull the top edge of the plunger to the center of the oil hole and press the piston slowly. Then there will be a block. When a position to block a sense of loss, which form the column plug top edge position just bump into a hole in the plunger. Remember this position, the plunger top edges introduced plunger sleeve, with fine sand bump grinding parts. When grinding, the fine sand strip plane and plunger axis is 45o, gently push and pull a few times, in order to eliminate edges and corners, burr can. But do not repair too much, so as not to affect the consistency of the initial angle of the cylinder oil supply and the uniformity of the oil supply.
For the delayed injection pump, the following methods can be adopted:
Baotou beiben heavy truck parts injection pump governor and injected amount of petrol or diesel, turn the camshaft, so that fuel injection pump and governor tappet fly ball parts move freely, prevent rust issuers, leading to runaway of diesel engine.
For the fuel pump, lower body decomposition, the pump body is flat, open the side cover, remove the pump head of the fastening nut, remove the pump head pliers grip plunger root, slowly out of the fault cylinder piston and spring, repeatedly washed with clean gasoline or diesel, washed and refitted, and alternately tighten the pump head nut, turn the camshaft, the pump handle review.
The overall type fuel injection pump, open the side cover, turn the camshafts with a screwdriver is inserted into the card plunger gently Tonelli leveraging spring, forcing the plunger down after reset to the exposed plunger sleeve outside clean plunger root injection gasoline or diesel, and turn Baotou beiben heavy truck with a cam shaft. Reciprocating movement of the plunger to be free, two rack before and after moving sensitive, clean cleaning oil, the governor into the shell of the amount of clean lubricating oil.