Bold reference numbers in this section identify parts shown in this exploded view diagram. These parts do not appear in the figures near the text.

Forced lubrication by gear pump. Built-in pressure relief by-pass valve. Mesh intake filter. Disposable filter cartridge on intake with safety valve preventing cartridge clogging. Low oil pressure indicator on instrument panel.

The oil gear pump (C) is driven by a toothed gear pair on the crankshaft. Pump flow rate therefore depends on engine speed (see reference values in Sect. D 5, Checking engine oil pressure).

After flowing out of the pump, the oil flows into the cooler before reaching the cartridge filter (P), which is fitted with an inner anti-clogging valve ensuring proper oil circulation under all conditions. Please note that oil is not filtered if the valve opens.

Once flowing off the pressurised circuit and after lubricating the above parts, the oil lubricates primary transmission, gearbox and gearbox shaft bearings while falling back down into the engine block.

The breather circuit for vapours built into the engine block includes a reed breather valve at right casing top, a collection tank and a connection line.

Remove the circlip (6), withdraw the bush (13) and remove the snap ring (3).

Insert pump driving gear (12), snap ring (3) and bushing (13) onto oil pump.

Insert by-pass valve (17) and spring (16) into pump then tighten plug (14) to the specified torque (Sect. C 3, Engine torque settings) applying a medium-strength threadlocker.

Place the oil pump on the casing and tighten the screws (9) and (10) to the specified torque (Sect. C 3, Engine torque settings).

Secure dial gauge part no. 88765.1058 provided with a special pointer on the casing to check the meshing clearance with the crankshaft sprocket.

Clearance must be 0.10 mm.