Introduction - ENGINE LUBRICATION SYSTEM

1.4 16v

GENERAL VIEW

The engine lubrication circuit is illustrated in the diagram.

1, Suction pipe with filter mesh

2, Oil pump

3, Oil filter cartridge

4, Main longitudinal duct

5, Sprays (piston skirt cooling)

6, Vertical duct (camshaft support lubrication)

7, Oil return to the sump

8, Switch for engine oil pressure warning light

1.3 JTD 16v

STRUCTURE

The engine lubrication system is represented below.

1 - Suction pipe with filter mesh

2 - Oil pump

3 - Oil filter cartridge

4 - Heat exchange (water oil) for cooling engine oil

5 - Spray jet (timing chain lubrication)

6 - Engine oil pressure warning light switch

7 - Turbocharger lubrication

8 - Engine oil level dipstick

9 - Engine oil level maintenance and scraper wall

10 - Timing chain cover

1.4 16v

ENGINE OIL PUMP

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

Vacuum is present between the sprocket separating wall (2) and the oil sump suction pipe.

Pressure instead develops after the separating wall (2) in all the oil delivery pipes (4).

When the pressure exceeds 5 bar, the force exerted on the limiting valve (5) overcomes the reaction of the spring below and moves the valve to open the connecting pipe between the pressure chamber (3) and the low pressure chamber (1).

1, Low pressure chamber

2, Separating wall

3, Pressure chamber

4, Oil delivery pipe

5, Pressure limiting valve

ENGINE OIL PUMP

OIL PRESSURE LIMITING VALVE IN CLOSED OPERATING POSITION

ENGINE OIL PUMP

OIL PRESSURE LIMITING VALVE IN BYPASS OPERATING POSITION