The injector 0445110077 is the  common rail diesel injector for the Volvo XC90 I (first generation) fitted with the 2.4 D engine (engine code D5244T), produced from 2003 to 2006.

0445110077 is a second‑generation common rail solenoid injector, specifically designed for high‑pressure diesel injection systems (up to ~1,600 bar). Its structural characteristics and advantages reflect Bosch’s established CR design from the mid‑2000s, which balances precision, durability, and serviceability.

Key Details:

• Manufacturer: Rsolid 

• Number: 0 445 110 077

• OEM Volvo Number: 30750781 (also 8653018, 30757857)

• Engine Application: D5244T (2.4L 5-cylinder turbo diesel, 120 kW / 163 hp)

• Vehicle Fitment: Volvo XC90 I (2003–2006) with the 2.4 D engine (not the D5; the 2.4D is essentially a lower‑powered version of the D5, but uses the same injector family)

1. Structural Characteristics

a) Solenoid‑Actuated Control Valve

• The injector uses an electromagnetic solenoid to control a servo‑hydraulic valve.

• When energised, the solenoid lifts a ball or armature valve, allowing high‑pressure fuel to escape from the control chamber. This reduces pressure above the nozzle needle, causing the needle to lift and injection to begin.

b) Hydraulic Amplification (Servo Principle)

• A control piston (or “spill valve”) uses a small volume of fuel to hydraulically amplify the solenoid movement. This allows very fast needle opening and closing with relatively low solenoid force.

c) Balanced Nozzle Needle

• The needle is hydraulically balanced to minimise the influence of rail pressure on opening and closing times. This results in consistent injection timing and quantity across the entire pressure range.

d) Sacless / Mini‑Sac Nozzle

• The injector tip features a mini‑sac or sacless design (depending on variant) to reduce residual fuel volume after injection. This helps minimise hydrocarbon emissions and reduces the risk of nozzle coking.

e) Integrated Fuel Return

• A low‑pressure fuel return port connects to the leak‑off system. Excess fuel (used for cooling and lubrication of internal components) is returned to the tank.

f) Replaceable Sealing Components

• The injector is clamped into the cylinder head using a hold‑down clamp, with a copper sealing washer at the tip. These are serviceable items during installation.

2. Functional Advantages

a) Precise Multiple‑Injection Capability

• Although primarily a “single‑event” injector in the D5244T calibration, the solenoid design supports pilot and post injections when paired with a suitable ECU. This reduces combustion noise, lowers NOx and particulate emissions, and improves cold start performance.

b) High Pressure Tolerance

• Rated for rail pressures up to 1,600 bar, enabling excellent fuel atomisation for complete combustion, reduced smoke, and improved fuel economy.

c) Low Internal Leakage

• Tight manufacturing tolerances in the control valve and needle guide minimise internal leakage, maintaining system efficiency and reducing fuel heating.

d) Durability and Longevity

• The solenoid injector has no piezo stack, making it more tolerant to fuel contamination and electrical stress than later piezo‑based designs. With proper fuel filtration, these injectors often exceed 200,000 km without failure.

e) Servo‑Hydraulic Reliability

• The hydraulic servo system provides consistent needle movement even as the injector ages. Wear in the solenoid armature is minimal compared to direct‑acting designs.

  
  

Where to buy:

 Rsolid is a professional diesel injector manufacturer that relies on the precision manufacturing capabilities of its own factories to provide high-quality solutions for the global commercial vehicle, construction machinery, marine, and agricultural diesel engine markets. Rsolid's business model typically includes maintaining a diverse and comprehensive OEM and high-end aftermarket parts inventory, and providing cross compatibility options to meet the needs of various applications and global customers, from individual workshops to large fleet operators. If you are looking for diesel injectors or OEM engine injectors, please feel free to contact us at any time.