Lubrication

LUBRICATION

Lubrication is forced by gear pump. The oil pump is fitted on the rear engine cover and it is operated by a shaft that receives motion from a gear installed behind on the crankshaft. The oil withdrawn from the sump through a suction device is filtered by the mesh filter on the actual suction device and then sent under pressure by the pump through a groove to the oil filter with full-flow cartridge fitted with a safety by-pass valve which ensures that the oil can still pass if the filter is clogged.

The maximum lubricating pressure is adjusted by a special limiting valve fitted on the pump. After being filtered, the oil flows through a transversal duct into the main longitudinal delivery duct machined in the crankcase. From here, it is ducted through three grooves to the lubricating grooves of the crankshaft main and rod bearings.

To improve cooling of the pistons on the right main bearing spray jets have been fitted on the front and centre main caps.

Through two transversal grooves and suitable branches machined in the crankcase and cylinder heads the oil reaches the camshaft bearings and allows the hydraulic tappets to work.

The cylinder head lubrication oil gathered in the trays of the camshaft bearings and the lubrication oil of the main and rod journals falls back into the sump.

The lubrication system is fitted with an oil vapour recirculation system which recovers the vapours coming from the sump.

Low oil pressure is signalled by a warning light on the dashboard connected to a sensor inserted on the rear engine cover.

1. Oil pump with pressure limiting valve
2. Oil sump
3. Oil filter with by-pass valve
4. Hydraulic tappet
5. Low oil pressure warning light sensor
6. Spray jets