Engine oil lubrication circuit

Description 1084B

2.4 20v

Introduction

The engine oil is drawn in from the sump by means of the vacuum created by the geared pump operated by the chain and forced under pressure into the filter and ducts.

When the pressure exceeds a set value, a pressure relief valve opens and discharges it.

The pump is operated by means of a 'silent' chain (1) which transmits the power from the crankshaft to the pump drive gear (2).

1 - Silent chain

2 - Drive gear

3 - Driven gear

4 - Safety valve

1.9 JTD 8v

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 relief valve

1.9 JTD 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 relief valve

1.9 JTD 8v

ENGINE OIL PUMP

Closed operating position of oil pressure limiting valve.

1.9 JTD 16v

ENGINE OIL PUMP

Closed operating position of oil pressure limiting valve.

1.9 JTD 8v

ENGINE OIL PUMP

Bypass operating position of limiting valve.

1.9 JTD 16v

ENGINE OIL PUMP

Bypass operating position of limiting valve.