SsangYong Korando II (1996-2006 year). Manual — part 118
1F2 -- 52 M161 ENGINE CONTROLS
DAEWOO MY_2000
FUEL RAIL
YAA1F0E0
M161 ENGINE CONTROLS 1F2 -- 53
DAEWOO MY_2000
Fuel Pressure Test
Tools Required
103 589 00 21 00 Fuel Pressure Gauge
1. Turn the ignition switch to “OFF” position.
2. Remove the fuel pressure test connector.
YAA1F700
3. Connect the fuel pressure gauge to the fuel pressure test connector.
4. Test the fuel pressure at idling by operating the engine using the fuel pressure gauge 103 589 00 21 00.
Vacuum Hose Connected (bar)
3.2~3.6
Vacuum Hose Disconnected (bar)
3.7~4.2
5. Replace the pressure regulator diaphragm if out of the specification.
Internal Leakage Test
1. Connect the fuel pressure gauge 103 589 00 21 00 to
the fuel pressure test connector.
YAA1F0K0
2. Stop the engine for approximately 30 minutes and then check the fuel pressure changes.
Pressure change
Fuel pressure drops slowly
D
Fuel leakage at the injector
D
Faulty fuel pressure regulator’s diaphragm and O-ring
Fuel pressure drops rapidly
D
Faulty check valve in the fuel pump
3. If there is no change in fuel pressure and maintain the following pressure over 30minutes, it is normal.
Fuel pressure (bar)
≥ 2.5
1F2 -- 54 M161 ENGINE CONTROLS
DAEWOO MY_2000
FUEL PRESSURE REGULATOR
YAA1F0F0
Function of the Fuel Pressure Regulator
The fuel pressure regulator maintains the fuel pressure
in the fuel line with the pressure of 3.2 bars to 3.8 bars
according to the intake manifold pressure. This operat-
ing pressure cannot be changed, and the fuel injection
volume will be only determined by the injection time.
Over supplied fuel returns to the fuel tank through the
return line.
<Operating at full load>
There is no negative pressure applied to the spring
chamber (9) during the full load, and it is separated from
the fuel chamber (8) by the diaphragm (5).
When the fuel pressure goes up, the diaphragm forces
the compression spring (6) in the direction of compres-
sion . At this moment, the valve (3) sticks to the dia-
phragm by the fuel pressure, and the fuel return line (2)
opens. The fuel over supplied returns to the fuel tank
through the return line.
YAA1F490
2. Fuel return line
3. Valve
5. Diaphragm
6. Compression Spring
8. Fuel Chamber
9. Spring Chamber
A. Valves Closed
B. Valves Opened
M161 ENGINE CONTROLS 1F2 -- 55
DAEWOO MY_2000
The pressure difference between the fuel pressure and
the intake manifold is about 3.8 bars during the full load.
YAA1F500
1. Fuel Pressure Regulator
2. Intake Manifold
3. Fuel Return (to fuel tank)
4. Fuel Supply (from fuel pump)
5. Fuel Pressure (approx. 3.8 bars)
6. Intake Manifold Negative Pressure (0 bar)
<Operating at Idle and partial load>
The spring chamber (9) is connected to the intake man-
ifold with the vacuum hose at the intake pipe connection
(7). The negative pressure generated in the intake man-
ifold activates the diaphragm, and thus the fuel pressure
gets reduced to the rate of the operating extent of the
diaphragm by the intake manifold’s negative pressure.
YAA1F510
Consequently, the fuel pressure in the fuel distributor
changes by the intake manifold’s negative pressure, and
the injector’s fuel pressure gets reduced independently
to the throttle valve’s position. Thus, the fuel injection
volume can only be determined according to the injec-
tor’s injecting duration.
The pressure difference between the fuel pressure and
the intake manifold is approx. 3.2 bars during idling.
YAA1F520
1. Fuel Pressure Regulator
2. Intake Manifold
3. Fuel Return (to fuel tank)
4. Fuel Supply (from fuel pump)
7. Fuel Pressure (approx. 3.2 bars)
8. Intake Manifold Negative Pressure (0.6 bars)
<Fuel Pressure Diagram>
YAA1F530
A. Fuel pressure
B. Intake Manifold Negative Pressure
LL. Idling
TL. Partial load
VL. Full load
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст