Delivery Valve; Injection Nozzle - Kubota WSM OC60-E2 Workshop Manual

OC60-E2, OC95-E2, WSM

(2) Delivery Valve

[3] INJECTION NOZZLE

The delivery valve consists of the valve (1) and the
valve seat (2).
The delivery valve prevents the fuel from flowing back
into the delivery chamber through the injection pipe. It
also prevents the fuel from dribbling at the injection
nozzle.
Reverse Suction Function (Dripping Prevention)
1. When the pressure-feeding of fuel ends, the delivery
valve lowers and relief plunger (3) section comes
into contact with the valve seat.
2. Furthermore, the valve descends until valve surface
is in contact with delivery valve seat (2) but as the
amount of fuel during interval A is sucked back from
inside the injection pipe, pressure within the pipe is
reduced giving improved cut-off of fuel injection by
the nozzle, thereby preventing subsequent dripping
of the injectors.
(1) Valve
(2) Valve Seat
Due to the use of a throttle type injection nozzle, the
fuel injection quantity is small at the beginning of
injection, and the fuel injection amount increases
gradually for the main fuel injection.
injection nozzle features smooth combustion rise and
quiet combustion.
The fuel is delivered into the nozzle body (4) by
injection pump through the bar filter (2) where fine
metallic particles, dirt and other in the fuel are removed.
When the fuel pressure overcomes the force of the
nozzle spring (3) (injection pressure: 13.92 to 14.51
MPa 142 to 150
valve (5) is pushed up and fuel is injected from the
injection port. The fuel which has lubricated between
the needle valve and nozzle body returns to the tank
through the fuel overflow pipe (1).
Injection pressure is adjusted by changing an
adjusting washer thickness.
(1) Fuel Overflow Pipe
(2) Bar Filter
(3) Nozzle Spring
M-8
ENGINE
(3) Relief Plunger
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This type of
, 2020 to 2133 psi) the needle
(4) Nozzle Body
(5) Needle Valve
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