07-5700 Testing fuel delivery pump
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A Measuring vacuum of fuel delivery pump
1 Connect tester (10) part no. 617 589 04 21 00 between feed pipe from fuel tank (9) and fuel delivery pump (7).
2 Start engine. After compressing the hose (arrow), the pressure gauge in the tester (10) indicates the vacuum of the delivery pump (7), 0.5 to 0.8 bar.
B Measuring pressure of delivery pump and opening pressure of overflow valve
1 Connect tester (10) part no. 617 589 04 21 00 between fuel delivery pump (7) or fuel preheater (6) (if fitted) and fuel filter (8).
2 Start engine. The pressure gauge in the tester (10) indicates the opening pressure of the overflow valve (4), min. 1.3 bar.
3 After compressing the hose (arrow), the pressure gauge in the tester (10) indicates the pressure of the fuel delivery pump (7), > 2.0 bar.
C Measuring clear passage of fuel filter
1 Connect tester (10) part no. 617 589 04 21 00 between fuel filter outlet (8) and injection pump (5).
2 Start engine. The pressure gauge in the tester (10) indicates the fuel outlet pressure, min 1.3 bar.
Note
When performing all the measurements, it is possible to determine whether the diesel fuel flows through free of bubbles.
D Testing return flow quantity
Preceding work: Engine warmed up to normal operating temperature. |
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1 Disconnect fuel return pipe from fuel sensor and place in a clean vessel (10-l can).
2 Start engine and rev up to governed speed.
3 Run engine at governed speed for exactly 2 minutes.
4 Switch off engine.
5 Measure out return flow quantity. Minimum quantity 3 liters.
6 Connect return flow pipe to fuel sensor.