Seam test on a fuel injection pump, and fuel injection pump required for applying same

Abstract

A process for leak testing in fuel injection pumps that have a pump housing that can be plugged into a motor housing, in which an outlet of the fuel injection pump, which feeds into an annular chamber that is divided by sealing rings and is normally discharged by way of a line, is closed with a material in order to carry out a leak test. The material is plastically deformable and dissolves with the heating of the fuel, and due to its plasticity, produces a sealed closure of the annular chamber in relation to the interior of the fuel injection pump so that the annular chamber can be loaded with a testing pressure via the line.

Description

technical field [0001] The invention relates to a fuel injection pump leak test method and a fuel injection pump implementing the method. The fuel injection pump has a pump casing that can be inserted into the engine casing, and the pump casing is contained by a fuel injection pump housing in the engine casing. On the shell surface surrounded by the wall of the fuel injection pump, there is an inlet for feeding fuel into the working chamber of the fuel injection pump and an outlet for returning fuel. This outlet leads to a first annular chamber, which is connected to the outside through a pump housing. A first sealing ring clamped between the outer surface of the pump housing and the wall of the housing is sealed against the inlet by a second sealing ring clamped between the outer surface of the pump housing and the wall of the housing, from a second The fuel supply to the inlet is carried out by an annular chamber, the second annular chamber being arranged between the outer s...

AI Technical Summary

Problems solved by technology

Here, during the tightness test, the problem arises that, inside the pump housing, a hydraulic short circuit occurs between the inlet and the outlet at least via a throttle connection, so that the above-mentioned sealing ring can only be partially isolated Check, check the outer sealing ring, the above-mentioned first sealing ring and the third sealing ring have no major problems, however, due to the hydraulic short circuit, the second sealing ring used as the seal between the first annular cavity and the second annular cavity There is a problem with the inspection

It is difficult, especially when the fuel injection pump is finally inserted into the engine housing, that it should be possible to test this seal, however, for example through a throttle gap at the fuel injection pump piston or oil leakage through a throttled cooling circuit would interfere with this test

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