CROSS SECTION OF THE PRECOMBUSTION CHAMBER AND FUEL INJECTION VALVE
1. Fuel injection line. 2. Nut. 3. Glow plug. 4. Body. 5. Nozzle assembly. 6. Precombustion chamber.
Fuel, under high pressure from the injection pumps, is sent through the fuel lines to the fuel injection valves. When the fuel under high pressure goes into the nozzle assembly, the check valve inside the nozzle opens and the fuel goes into the precombustion chamber. The injection valve changes the fuel to many very small drops of fuel. This gives the fuel the correct characteristics for good combustion.