INTRODUCTION - ENGINE LUBRICATION

1.2 8v

VIEW OF ASSEMBLY

1. Suction head with filter mesh

2. Oil pump

3. Oil filter cartridge

4. Main longitudinal duct

5. Jets (piston skirt cooling)

6. Vertical channel (camshaft mountings lubrication)

7. Oil falling back into sump

8. Switch for engine oil pressure warning light

Engine oil pump

The engine oil is drawn in by the sump by means of the vacuum created by the rotation of the gears on the crankshaft.

There is a vacuum from the partition (2) for the gears as far as the oil sump suction head.

Pressure builds up in all engine oil supply ducts (4) starting from separation partition (2).

When the pressure exceeds 5 bar, the force exerted on limit valve (5) overcomes the reaction of the spring underneath and moves the valve until the connecting duct between pressure chamber (3) and low pressure chamber (1) opens.

1. Low pressure chamber

2. Partition

3. Pressure chamber

4. Oil supply duct

5. Pressure limit valve

Engine oil pressure limit valve closed operating position

Limit valve short circuit operating position

1.3 Multijet

STRUCTURE

The engine lubrication system is shown below.

1. Suction head with filter mesh

2. Oil pump

3. Oil filter cartridge

4. Coolant/engine oil heat exchanger

5. Jet (timing chain lubrication)

6. Switch for engine oil pressure warning light

7. Turbocharger lubrication pipes

8. Engine oil dipstick

9. Engine oil level maintenance and oil-scraper ring partition

10. Timing chain cover

1.4 16v

ENGINE OIL SUPPLY CIRCUIT

VIEW OF ASSEMBLY

The engine lubrication circuit is illustrated in the diagram.

1. Suction head with filter mesh

2. Oil pump

3. Oil filter cartridge

4. Main longitudinal duct

5. Jets (piston skirt cooling)

6. Vertical channel (camshaft mountings lubrication)

7. Oil falling back into sump

8. Switch for engine oil pressure warning light

ENGINE OIL PUMP

The engine oil is drawn in by the sump by means of the vacuum created by the rotation of the gears on the crankshaft.

There is a vacuum from the partition (2) for the gears as far as the oil sump suction head.

Pressure builds up in all engine oil supply ducts (4) starting from separation partition (2).

When the pressure exceeds 5 bar, the force exerted on limit valve (5) overcomes the reaction of the spring underneath and moves the valve until the connecting duct between pressure chamber (3) and low pressure chamber (1) opens, thereby limiting the maximum pressure value in the circuit.

1. Low pressure chamber

2. Partition

3. Pressure chamber

4. Oil supply duct

5. Pressure limit valve

ENGINE OIL PRESSURE LIMIT VALVE IN CLOSED OPERATING POSITION

ENGINE OIL PRESSURE LIMIT VALVE IN SHORT CIRCUIT OPERATING POSITION