350 Bullet Oil Pump Diagrams; Feed Pump Position; Return Pump Position - Royal Enfield 350 BULLET 1949 Workshop Maintenance Manual

ROYAL ENFIELD WORKSHOP MANUAL
FEED PUMP
POSITION 1
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 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 U in the disc
registers with the delivery port X in the housing,
so that oil blow the disc in the housing is forced
through U and X to the big end.
RETURN PUMP
POSITION 1
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.
Section B2 Page 4

350 BULLET OIL PUMP DIAGRAMS

The ports in the housing are connected as follows
X - delivery to big end.
Y - suction from oil tank
Z - suction from oil tank
The ports in the housing are connected as follows
X' - delivery to rocker gear
Y - suction from crankcase.
FEED PUMP
POSITION 2
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 suction port
Z in the housing is uncovered by the disc and oil
is drawn into the housing below the disc from the
oil tank.
RETURN PUMP
POSITION 2
Position 2. The Plunger A' is being pushed
into the cylinder hole in the disc C. The port T'
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'.