Fuel Pump; Fuel Injection Pump - Westerbeke Universal M-50 Operator's Manual

FUEL PUMP
Filtered fuel is forcibly sucked from the tank by the fuel pump and fed under pressure to the
injection pump. Inlet and discharge pressures are produced by a vertical movement of the
diaphragm which is caused by the special cam (for pump) of the fuel camshaft. Fuel is suctioned
on the downward stroke, and discharged on the upward stroke. A system of two valves allows fuel
to flow in only one direction.
FUEL INJECTION PUMP
Inlet stroke Discharge stroke
(6)
t
.,
1. From Fuel Filter
2. Inlet Valve
3. Outlet Valve
4. Diaphragm
5. Fuel Camshaft
6. To Injection Pump
The K type mini pump is provided, it features high injection quality even at low engine speed. The
fuel injection pump plunger is reciprocated by the fuel camshaft which is driven by the crankshaft
through a system of timing gears. Fuel camshaft rpm is 1/2 of camshaft rpm.
(2)
(3)
Fuel Injection pump
~-..l~'---
(9)
-+-'I::P1P'
~~-(6)
1. Delivery Valve Holder
2. Delivery Valve Spring
3. Delivery Valve
4. Plunger
5. Cylinder Pump Element
6. Control Rack
7. Tappet
8. Plunger Spring
9. Air Vent Screw
42
(9)
(1)
(5)
(4)
(7)