Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 145/146 Engines, 146 Bodywork and Engine Overhaul Manual (1994-2001)10 · Engine overhaul: 1.9 JTD (AR32302)
10 · Engine

Oil pump

Make
Alfa Romeo
Model
145/146 Engines, 146 Bodywork and Engine Overhaul Manual
Year
1994–2001
Section
Generalities › Oil pump
Engine overhaul: 1.9 JTD (AR32302)Oil pump

OIL PUMP

The engine oil is withdrawn from the sump by the vacuum created by the rotation of the gears shrunk onto the crankshaft.

The vacuum is present starting from the separation partition (2) of the gears up to the oil sump suction device.

On the other hand, the pressure develops starting from the separation partition (2) in all the engine oil delivery ducts (4).

When the pressure exceeds 5 bar, the thrust exerted on the limiting valve (5) overcomes the reaction of the spring below and moves the valve until it opens the connection duct between the pressure chamber (3) and the low pressure chamber (1).

Oil pump assembly diagram showing labeled parts 1, 2, 3, 4, and 5.
  1. pressure chamber
  2. separation partition
  3. gear
  4. engine oil delivery ducts
  5. limiting valve
Closing operating position of the engine oil pressure limiting valve.
Short circuit operating position of the limiting valve.

Parts & tools for this job For 1994 Alfa Romeo 145/146

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.