Operation
2722−1/A1
Winterthur Gas & Diesel Ltd.
1/ 3
Injection Valve (FAST Nozzle)
1. General
Three Fuel Actuated Sacless Technology (FAST) injection valves (3, Fig. 1) are
installed in each cylinder cover (1).
Fuel, which leaks because of the needle clearance, drains through the connection
leakage fuel drain (LD, Fig. 2) to the fuel leakage pipe (6) and into the collector
block (5) (see 8019−1 Fuel Oil System).
Fuel, which can leak between the nozzle body (11), clamping nut (13), coupling
nut (16) and nozzle holder (9) (leakage) flows up and shows at the top edge of the
cylinder cover at the leakage fuel outlet (LO).
Note: If fuel shows at the leakage fuel outlet (LO), do an overhaul of the
applicable parts. If exhaust gas goes out of the injection valve at the
leakage fuel outlet (LO), the sealing face (SF) is damaged. Do an overhaul
of the sealing face (see the Maintenance Manual 2708−3).
WARNING
Injury Hazard: Fuel flows at high pressure in the fuel leakage
pipes (6). Before you remove the fuel leakage pipes, make sure
that the pressure is released.
See the Maintenance Manual 2722−1 for the tasks that follow:
D To disassemble
D To assemble
D To do tests
D Injection valve settings.
2. Function
Fuel flows at high pressure from the injection control unit (7, Fig. 1) to the three
injection valves (2).
The fuel quantity necessary for injection flows through the connection fuel supply (FS,
Fig. 2) and the fuel bore (FB) to the nozzle body (11). The pressure of the fuel lifts the
needle (14) against the force of the compression spring (17), and a fuel mist is
injected into the combustion chamber.
2017−08
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