ROYAL ENFIELD 350cc and 500cc O.H.V. WORKSHOP MANUAL
Page 16
Position 1.
Plunger A is being drawn out of cylindrical hole in
disc C by action of peg B on shaft D. Port T in disc C
registers with suction passage Y in housing. Delivery
passage W in housing is uncovered. Oil flows through
Y and T to fill pump cylinder and at same time oil in
housing is forced through W to cylinder wall.
Position 2.
Plunger A is being pushed into cylindrical hole in disc
C. Port T in disc registers with delivery passage X.
Suction passage Z is uncovered. Oil is pushed through
T and X to big-end bearing and at same time oil flows
into housing through Port Z.
Position 1.
Plunger A is being drawn out of cylindrical hole in
disc C. Ports U and V in disc register respectively
with suction passage Y and delivery passage Z in
housing. Oil flows through Y and U to fill pump
cylinder and at same time oil in housing is forced
through V and Z to delivery passage.
Position 2.
Plunger A is being pushed into cylindrical hole in disc
C. Ports T and U in disc register respectively with
suction passage Y and delivery passage Z in housing.
Oil flows through Y and T to fill pump housing and at
same time oil in pump cylinder is forced through U
and Z to delivery passage.
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