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betamotor.com
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Maintenance and checks
ENGLISH
LUBRICATION CIRCUIT
The output oil pump (1) draws in oil from the area at the
base of the gearbox through its own mesh oil filter (2)
and then sends it to the paper oil filter (3). From here
the oil, starting from the bypass valve (4), is directed in
three different directions: by means of a jet (5) it lubri-
cates the piston pin and takes heat from the crown of the
piston; and it passes through two pipes, one of which (6)
takes it to the crankshaft to lubricate the roller bearing
on the crankpin; the other (7), whose flow is regulated
by a jet (8), feeds the valvegear (9). The oil then returns
to the base of the crank chamber from the piston, the
conrod assembly and the cylinder walls, and is drawn in
by the scavenge pump (10) through the mesh filter (11).
It is pumped through special jets (12) and lubricates the
transmission gears. The oil in the cylinder head, however,
returns to the base of the gearbox passing through the
timing case and the inner clutch casing.
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