Figure 278 shows a diagram of the engine lubrication circuit.
Figure 278 Lubrication circuit diagram. 1. Oil intake mesh filter; 2. Oil pump; 3. Oil pressure relief valve; 4. Bypass valve (in the oil filter); 5. Lubrication channel in the cylinder block; 6. Oil pressure switch; 7. Lubrication channel in the cylinder head; 8. Camshaft bearing; 9. Oil return channel; 10. Oil radiator
(Source can be seen at: PEUGEOTBOOK)
