Oil Pump Fiat Alfa Lancia 1.3 d Diesel

The oil pump with OE code 55233278 is an essential mechanical component for the correct operation of second-generation 1.3 Multijet diesel engines. Used in numerous vehicles of the FCA group, it ensures the lubrication of all the engine's internal components by generating a constant engine oil pressure. It is a gear pump mounted in the lower part of the crankcase, coupled to the crankshaft, and integrated with the oil suction manifold (pick-up).

Technical specifications

The OE 55233278 pump is made of high thermal and mechanical resistance die-cast aluminum. Its main characteristics include:

• Type: gear oil pump with direct mechanical drive
• Light alloy housing with accommodation for the pick-up and a pressure relief/regulating valve
• Oil suction tube integrated into the structure with a filtering screen
• Average weight: about 3 kg
• Nominal pressure: variable depending on engine speed and internal tolerances
• Internal overpressure valve to protect the lubrication circuit

DIPA offers a range of original and equivalent-quality aftermarket spare parts.

Functionality

The oil pump 55233278 is responsible for drawing oil from the engine sump through the pick-up tube and supplying it under pressure to the various branches of the lubrication circuit. The flow reaches the crankshaft, main and connecting rod bearings, camshaft, hydraulic lifters, and turbocharger. Proper operation of the pump is essential to reduce friction between mechanical components and to ensure the longevity of the powerplant. The internal pressure valve keeps the flow stable even in cold conditions, at high revs, or with changes in oil viscosity.

Make and model on which the part is mounted

The oil pump with OE code 55233278 is installed on 1.3 Multijet Euro 5 and Euro 6 engines (engine codes 199B1.000, 199B4.000 and derivatives) and is present in numerous FCA group models and vehicles developed in collaboration with other manufacturers. The main compatible vehicles include:

Fiat:

• 500
• 500C
• 500L
• Panda 1.3 Multijet
• Punto
• Punto Evo
• Qubo
• Fiorino

Lancia:

• Ypsilon

Alfa Romeo:

• MiTo

DIPA recommends always checking compatibility based on the specific engine code and the chassis number.

Faults and causes

Over time, the oil pump 55233278 may exhibit several types of malfunctions, often caused by mechanical wear, contamination, or inadequate lubrication. The most common failures include:

• Loss of pressure due to wear of internal gears or excessive clearance between rotor and housing
• Pick-up blockage due to sludge or metallic debris buildup, which hinders oil suction
• Failure of the pressure relief valve, which can block flow or cause overpressure
• Oil leaks due to damaged or misaligned gaskets
• Partial seizure or noise due to inadequate lubrication at start-up or with degraded oil

Insufficient oil pressure can severely compromise the engine, causing damage to bearings, the camshaft, and the turbocharger.

Conclusions

The oil pump with OE code 55233278 is a crucial component for the lubrication of 1.3 Multijet engines installed in numerous FCA group vehicles and affiliated brands. Designed to ensure reliability, optimal flow and pressure in all operating conditions, it requires particular attention to maintenance and the quality of the oil used. Pump failures can cause serious mechanical damage if not detected promptly.

DIPA supplies the component in a new version, ready for installation, with warranty and compatibility across all affected models. Ask for the availability of ready parts in stock for quick replacements and reduced vehicle downtime.