High Quality New Control Valve Metering Plunger 3411711 Barrel Plunger for Cummins M11 N14 Engine Spare Parts

The diesel plunger is a key component in the diesel engine. Its construction usually includes the following parts:
1. Plunger body: The plunger is usually a cylindrical part, and its surface is precision machined to ensure sealing performance with the plunger sleeve. There is usually a chute or spiral groove at the upper end of the plunger, which is used to control the amount and time of fuel injection.
2. Plunger sleeve: The plunger sleeve is a sleeve that fits the plunger. It has a precise cylindrical hole inside to accommodate the plunger. The upper end of the plunger sleeve usually has an oil inlet hole and an oil return hole, which are used for the entry and return of fuel respectively.
3. Oil delivery valve: The oil delivery valve is a one-way valve, usually located on the top of the plunger sleeve. Its function is to prevent high-pressure fuel from flowing back into the plunger sleeve after the fuel injection is completed, thereby ensuring the injection pressure and injection time of the fuel.
4. Plunger spring: The plunger spring is usually located at the bottom of the plunger and is used to push the plunger upward into contact with the camshaft. The elastic coefficient and preload force of the plunger spring have an important impact on the fuel injection amount and injection time.
5. Camshaft: The camshaft is an important component in a diesel engine. It drives the up and down movement of the plunger through the rotation of the cam. The rotation speed of the camshaft and the shape of the cam have an important impact on the amount and timing of fuel injection.
6. Roller body: The roller body is a part in contact with the camshaft. Its function is to convert the rotational motion of the camshaft into the up and down motion of the plunger. The roller body usually consists of a roller and a roller shaft, and the roller shaft is connected to the plunger.
7. Adjustment mechanism: The adjustment mechanism is used to adjust the fuel injection amount and injection time, and usually includes an adjustment screw and an adjustment spring. The adjusting screw is used to adjust the stroke of the plunger, thereby adjusting the amount of fuel injection; the adjusting spring is used to adjust the preload force of the plunger, thereby adjusting the fuel injection time.