Diesel Fuel Injection: Operation: Injectors

The injection nozzles spray fuel into a prechamber as each compression stroke occurs. Nozzles can be disassembled, cleaned and adjusted to correct improper spray patterns.

Injector opening pressure is adjusted with a shim on top of the needle valve return spring. See Fig 3. The injector receives a high pressure pulse of fuel which forces open the needle valve allowing the fuel to pass into the prechamber.

Fig 1: Diesel Kiki Diesel Fuel Injection Pump

Courtesy of MAZDA MOTORS CORP.

Shop disassembly of injection pump is not recommended. 

Fig 2: Mazda B2200 Fuel System

Courtesy of MAZDA MOTORS CORP.

Bleed air from system whenever fuel lines are opened. 

Fig 3: Mazda B2200 Injector

Courtesy of MAZDA MOTORS CORP.

Injector must be free of dirt prior to reassembly.