Westerbeke WPDS-20 Technical Manual page 28

LUBRICA TION SYSTEM
A full pressure wet sump system is
employed. The eccentric-rotor type
pressure pump is located within the
engine crankcase and driven by helical
gears from the camshaft. The pump
has a delivery of 2 gall min (9. 1 litres)
at 1000 rev/min of engine speed and
provides a maximum pressure, con-
trolled by a relief valve, of 50 lbf/ in 2
(3. 62 kgf/ cm 2 ) to all moving parts.
Oil is drawn through a gauze strainer
in the sump and before entering the
system passes through a detachable
external filter of the full flow type.
It
is then fed to the main, big-end. cam-
shaft and small-end bearings. A re-
stricted oil supply is fed to the valve
rockers via the hollow rocker shaft and
the returning oil lubricates valve caps,
push-rod ends, and tappets.
AS
FUEL INJECTION EQUIPMENT
A distributor-type fuel injection pump
incorporating an all-speed mechanical
governor is fitted. The pump is driven
at half-engine speed from stable idling
at approximately 500 rev / min to
3500 rev/min. The diaphragm-type
lift pump, which incorporates a hand
priming device, is mechanically oper-
ated from the engine camshaft and
provides fuel to the injection pump
under constant pressure. Each injec-
tor is fitted with a Pintaux-type nozzle
and injects at a pressure of 135 atmos.
(138.9 kgf/cm 2 ) (1984 psi).
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