Introduction - ENGINE LUBRICATION SYSTEM

1.2 16v, 1.4 16v

VIEW OF ASSEMBLY

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

1.6 16v

Engine oil supply circuit

The engine oil supply circuit is shown in the following figure.

1, Suction pipe with filter mesh

2, Oil pump

3, Oil filter cartridge

4, Main longitudinal duct

5, Camshaft bearings vertical duct

6, Oil return to the sump

7, Engine oil pressure warning light switch

1.8 16v

VIEW OF ASSEMBLY

The main engine lubrication system components are illustrated in the diagram below

1, Suction pipe with filter mesh

2, Oil pump

3, Oil filter cartridge

4, Water/oil heat exchanger

5, Main longitudinal duct

6, Jets (piston skirt cooling)

7, Vertical duct (camshaft support lubrication)

8, Oil return to sump

9, Engine oil pressure warning light switch

2.4 20v

STRUCTURE

The engine lubrication system is represented below.

1 - Suction pipe with filter mesh

2 - Oil pump

3 - Oil filter cartridge

4 - Engine oil heat exchanger

5 - Main longitudinal duct

6 - Sprays

7 - Vertical duct (camshaft support lubrication)

8 - Variable valve timing ducts

9 - Oil return to sump

10 - Switch for engine oil pressure warning light

11 - Counter-rotating shaft ducts

1.9 JTD 8v

STRUCTURE

The engine lubrication system is represented below.

1 - Suction pipe with filter mesh

2 - Oil pump

3 - Oil filter cartridge

4 - Water/oil heat exchanger

5 - Main longitudinal duct

6 - Jets (piston skirt cooling)

7 - Vertical duct (camshaft support lubrication)

8 - Oil return to sump

9 - Engine oil pressure warning light switch

10 - Turbocharger lubrication pipes

11 - Engine oil level sensor

1.9 JTD 16v

STRUCTURE

The engine lubrication system is represented below.

1 - Suction pipe with filter mesh

2 - Oil pump

3 - Oil filter cartridge

4 - Engine oil cooling radiator

5 - Main longitudinal duct

6 - Jets (piston skirt cooling)

7 - Vertical duct (camshaft support lubrication)

8 - Oil return to sump

9 - Engine oil pressure warning light switch

10 - Turbocharger lubrication pipes

11 - Engine oil level sensor

1.2 16v, 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

1.6 16v

Engine oil pump

The engine lubrication system is pressurized by a geared pump fixed to the crankcase.

The pump is operated by the gear through the auxiliary shaft. A restricter valve controls the system pressure.

During the intake, the oil is filtered through a mesh filter in the inlet casing and then through a replacable filter element, in the fuel line.

1, Auxiliary shaft

2, Restricter valve

3, Gauze filter

4, Pump casing

1.8 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

1.2 16v, 1.4 16v

Engine oil pump

OIL PRESSURE LIMITING VALVE IN CLOSED OPERATING POSITION

1.8 16v

Engine oil pump

Closed operating position of oil pressure limiting valve.

1.2 16v, 1.4 16v

Engine oil pump

OIL PRESSURE LIMITING VALVE IN BYPASS OPERATING POSITION

1.8 16v

Engine oil pump

Bypass operating position of limiting valve.