Fuel injection pump for internal combustion engines

A fuel injection pump for an internal combustion engine having a pump housing, an electromagnetic valve with a magnet and a valve seat, a pump work chamber, a relief chamber, a channel which connects said pump work chamber to said relief chamber and which includes a passage connected to and controlled by said electromagnetic valve, wherein said fuel injection pump also includes:

• a threaded magnet housing in which said magnet is housed and which is threaded to said pump housing and which has an inner bore with a step, wherein the electromagnetic valve is embodied as a seat valve having a movable valve element which is connected to said pump work chamber to be biased in a closed direction by pressure prevailing in the pump work chamber, and wherein said fuel injection pump also includes:
• a valve body positioned to enclose said valve seat and said movable valve element within said pump housing and having a bore which comprises a portion of said channel;
• and
• an expansible casing positioned between said valve body and said magnet housing such that said threaded magnet housing surrounds said expansible casing, whereby said casing allows for variable expansions of said valve body, said magnet housing and said pump housing occuring with temperature changes.