Royal Enfield 350 BULLET 1949, Workshop Maintenance Manual

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ROYAL ENFIELD WORKSHOP MANUAL
500 BULLET OIL PUMP DIAGRAMS
FEED PUMP FEED PUMP
POSITION 1 POSITION 2
The ports are connected as follows:
X - in the housing is the delivery to the big end.
Y - in the housing is the suction from the oil tank.
S and V - are drilled through the disc.
T and U - are drilled from the underside of the disc into the cylinder hole.
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 U in the disc C
registers with the suction port Y in the housing so
that oil is drawn into the cylinder from the oil
tank. At the same time the port S in the disc
registers with the delivery port X in the housing
so that oil below the disc in the housing is forced
through S and X to the big end.
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 end. At the same time the port V in the
disc registers with the suction port Y in the
housing and oil is drawn into the housing below
the disc from the tank.
RETURN PUMP RETURN PUMP
POSITION 1 POSITION 2
The ports arc connected as follows:
X - in the housing is the delivery to the rocker gear.
Y - in the housing is the suction from the crankcase.
S and V - are drilled through the disc.
T and U – are drilled from the underside of the disc into the cylinder hole.
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 U' 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 S' in the disc
registers with the delivery port X' in the housing,
so that oil below the disc to the housing is forced
through S' 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 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 B2 Page 5
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