145 - MiTo   1.4 16v TJet   INTRODUCTION - ENGINE LUBRICATION      

ENGINE OIL LUBRICATION SYSTEM

The lubrication system is equipped with an integrated oil filter system known as a green filter.

The device is fitted on the oil pump mounting and comprises:

- a support containing an oil filter cartridge sealed by a plastic cap;

- a heat exchanger.

The heat exchanger is only handled by the Parts Dept. together with the support containing the oil filter cartridge.

1. Suction head with filter mesh

2. Oil pump

3. Green filter integrated system

4. Main longitudinal duct

5. Jets (piston skirt cooling)

6. Vertical channel (camshaft mounting lubrication)

7. Oil falling back into sump

8. Switch for oil pressure warning light

9. Turbocharger oil supply pipe

10. Oil return pipe from turbocharger and from oil filter mounting

11. Oil filter cartridge cover

The following are found on the integrated oil filter system: the connector for the supply pipe to the turbocharger and the coolant inlet/outlet connectors for the heat exchanger.


1. Thermostat

2. Water pump rigid return pipe

3. Water supply pipe to heat exchanger

4. Water return pipe from heat exchanger

5. Oil return pipe from turbocharger and heat exchanger

6. Water return pipe from turbocharger

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 6 bar +/- 0.3, the force exerted on the restrictor valve (5) overcomes the reaction of the spring underneath and moves the valve until the connecting duct between the pressure chamber (3) and the low pressure chamber (1) opens limiting the value of the pressure in the circuit.


1. Low pressure chamber

2. Partition

3. Pressure chamber

4. Oil supply duct

5. Pressure limit valve

Engine oil pressure restricter valve closed operating position


Engine oil pressure restricter valve short circuit operating position