Fuel injection pump of diesel engine fuel supply system is the " heart ". Fuel injection pump precision coupling card lag, would result in an engine speed instability, serious when can cause engines to stall and a runaway accident.

Fuel pump seizing

The old fuel pump, which causes stagnation card for diesel is not clean, the plunger with the plunger between the sets of mechanical impurities, or the surface of the plunger with the plunger sleeve to be strained, or plunger bump top corner being generated by burr.

The new fuel pump, the card lag for the following reasons:

( 1) at present, some manufacturers of fuel injection pump and fuel injection pump repair units in the debugger, do not pay attention to high-quality diesel engine, which used to debug the actual glial content of the larger, higher acidity. After this adjustment, the fuel injection pump parts with precision even with a layer of residual surface adhesion of the film. If the fuel pump storage for too long, this film will gradually generate layer of organic sediment and binding glue, have a card will be installed hysteresis.

( 2) the fuel pump storage for safekeeping, packaging lax, moisture-proof rust-proof material leakage or damage, tubing joint dust cap is lost or damaged, will also have the card hysteresis phenomenon.

Card lag process

For the use of the old fuel pump can be found out, stick the plunger coupled parts and remove for cleaning, clean diesel. Romse I is mechanical strain, can be washed clean of oil mill. If the plunger top is knocking burrs ( naked eye to observe ), when the plunger plunger sleeve top indentation would send acerbity hairpin, and must not be repeated rotation or drawing the plunger, to avoid burr scratch plunger sleeve. The correct approach is: will the plunger top corners spot to pull the plunger sleeve flush into the center hole, slowly rotating the plunger, then there will be a sense block. When a position to block a sense of loss, that specifies 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 strip bump grinding parts. Grinding, the fine sand plane with the plunger axis 45 , a few push-pull gently to remove the edges and corners, can burr. But not too much grinding, so as not to affect the initial angle of the cylinder oil supply quantity of the consistency and uniformity.

The blocking of new fuel pump, using the following methods:

( 1) to the injection pump and governor injected with an appropriate amount of petrol or diesel, repeatedly rotating camshaft, so that fuel injection pump and governor tappet fly ball movement and other components easily, prevent rust issuers, leading to runaway of diesel engine.

( 2) for the lower body can be decomposed, fuel injection pump ( such as 485, 695, 4125, 6130 models such as by usingⅠ,Ⅱ,Ⅲfuel pump ), the pump body is flat, open the side cover, remove the pump head fastening nuts, remove the pump head, with pliers clamp piston root slowly, taking the fault cylinder plunger and a spring ( pay attention to not hurt the plunger ), with clean gasoline or diesel repeated washing, wash refitted (note the plunger adjusting arm must be loaded regulating fork ), and the alternation of screw pump head nut, rotation of a cam shaft, a pump handle review.

( 3) the overall type fuel injection pump ( such as 6110, 6135, 6160 models such as by using A, B type pump ), open the side cover, the rotating cam shaft, with a screwdriver is inserted into the card plunger gently Tonelli leveraging spring