ROYAL ENFIELD WORKSHOP MANUAL
"250 CLIPPER" OIL PUMP DIAGRAMS
Position 1. The plunger A is being drawn out of the
cylinder hole in the disc C by the action of the peg B on
the shaft D. The port T in the disc C registers with
suction port Y in the housing, so that oil is drawn into
the cylinder from the oil tank. At the same time the
delivery port W in the housing is uncovered and oil
below the disc in the housing is forced through W to the
back of the engine cylinder wall.
Position 1. The plunger A' is being drawn out of the
cylinder hole in the disc C. The port T' in the disc
registers with the suction port Y' in the housing. so that
oil is drawn into the cylinder from the crankcase sump.
At the same time the port U' in the disc registers with
the delivery port X' in the housing, so that oil below the
disc in the housing is forced through U' and X' to the
rocker gear.
Position 2. The plunger A is being pushed into the
cylinder hole in the disc C. The port T in the disc now
registers with the delivery port X in the housing so
that oil is forced out of the cylinder to the big sad. At
the same time the suction port Z in the housing is
uncovered and oil is drawn into the housing below the
disc from the oil tank.
Position 2. The plunger A' is being pushed into the
cylinder hole in the disc C'. The port T' in the disc now
registers with the delivery port X' in the housing, so
that oil is forced out of the cylinder to the rocker gear.
At the same time the port V in the disc registers with
the suction port Y' in the housing, so that oil is drawn
into the housing below the disc from the crankcase
sump through V and Y'.
Section B3 Page 6
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