According to experts, the main cause of gasoline entering the crankcase is damage to the diaphragm of the fuel pump. To better understand how this happens, you need to remember its principle of operation.
Necessary
- - set of wrenches;
- - diaphragm
Instructions
Step 1
Most modern car engines are powered by mechanically driven pumps. It consists of a body, a flexible diaphragm and two valves. At the moment when the diaphragm moves down, a vacuum is created and the upper valve opens towards the fuel tank, while the lower one closes. When the diaphragm moves up, it squeezes out the fuel, so that the lower valve opens towards the carburetor, and the upper one naturally closes. The reciprocating motion is facilitated by the eccentric of the engine camshaft, which means that the diaphragm is only able to function while the engine is running.
Step 2
The obvious signs of diaphragm damage are fuel leaking and smell, and in some cases, fuel entering the crankcase while idling. There is only one way out of this situation - replacing the diaphragm. Here, for example, is how it is done on a VAZ 2106 car.
Step 3
To remove the pump, take a 10 wrench, unscrew the mounting bolts, remove the pump and place it on a sheet of paper or cloth prepared in advance. Next, remove the cover and carefully remove the mesh filter. After inspecting the inlet valve, reinstall it, if necessary, into the seat. Wash the filter in solvent and blow it out with compressed air.
Step 4
Using a Phillips screwdriver, remove the six screws connecting both pump housing parts and separate them. After that, check the inlet and outlet valves, rinse the upper part of the housing in gasoline and blow it off with compressed air. Next, turn the diaphragm assembly 900, then pull it out of the bottom of the body and remove the spring from the stem.
Step 5
Using a wrench 8, unscrew the nut and sequentially remove the upper steel cup, two working diaphragms, inner and outer spacers, as well as the lower washer and cup.
Step 6
To avoid damage to the safety diaphragm when disassembling the fuel pump, which can eventually adhere to the body and gasket, carefully separate it with a thin knife or flat feeler. After cleaning the filters and replacing damaged diaphragms, reassemble the pump in reverse order.
