Leak Test

Check Fuel Low Pressure Circuit





Shown on engine 605 (5 cylinder, non-U.S.)

Figure 1
019 Pressure tester
60 Fuel heater
70/2 Fuel main filter
70/6 Fuel filter outlet to electrohydraulic actuator (Y1/1)
80 Fuel tank
90/1 Cold fuel suction hose
90/2 Warm fuel return hose
90/3 Leak-off hose
90/5 Fuel return hose to fuel tank

Y1/1 IFI electrohydraulic shut-off actuator

Engine 606.912 IFI
1. Air filter air intake line
Remove, install.

1a. Resonance intake line
Remove, install.

2. Shaft cover on valve cover
Remove, install. At the assembly make sure that the leak-off hose from cylinder 1 to the fuel return hose (90/5) is correctly routed.

3. Leak-off hoses (90/3) between the injectors
Check for leaks, replace if necessary.

4. Leak-off hose (90/3) from cylinder 1 with special pliers
Disconnect, connect. Caution! Do not pull on hose

5. Suction line to fuel heater (90/1) and fuel return hose (90/5)
Pinch off with clamps and remove clamps

6. Fuel low pressure circuit
Drain partially (e.g. disconnecting a fuel line).

7. Pressure tester (019) on leak-off line (90/3)
Connect, disconnect.

8. Fuel low pressure circuit with 900 mbar
Pressurize and set pointer.
Maximum pressure drop 20 mbar after 2 minutes
If pressure drop > 20 mbar, check system with soap water (e.g. diluted dishwashing liquid) for leaks.