SEN03836-01
WA250, 250PZ-6 30-110
31
110 Testing and adjusting, Part 1
Testing leakage in fuel system
Testing leakage in fuel system
1
k
Very high pressure is generated in the high-
pressure circuit of the fuel system. If fuel
leaks while the engine is running, it is dan-
gerous since it can catch fire.
After testing the fuel system or removing
its parts, test it for fuel leakage according
to the following procedure.
a Clean and degrease the engine and the parts
around it in advance so that you can test it eas-
ily for fuel leakage.
1. Spray color checker (developer) over the fuel
supply pump, common rail, fuel injector, and
joints of the high-pressure piping.
2. Run the engine at speed below 1,000 rpm and
stop it after its speed is stabilized.
3. Inspect the fuel piping and devices for fuel
leakage.
a Check mainly around the high-pressure
circuit parts coated with the color checker
for fuel leakage.
a If fuel leakage is recognized, repeat the
procedure from step 1 after repairing the
leakage.
4. Run the engine at low idle.
5. Inspect the fuel piping and devices for fuel
leakage.
a Check mainly around the high-pressure
circuit parts coated with the color checker
for fuel leakage.
a If fuel leakage is recognized, repeat the
procedure from step 1 after repairing the
leakage.
6. Run the engine at high idle.
7. Inspect the fuel piping and devices for fuel
leakage.
a Check mainly around the high-pressure
circuit parts coated with the color checker
for fuel leakage.
a If fuel leakage is recognized, repeat the
procedure from step 1 after repairing the
leakage.
8. Start the engine and stall the HST or relieve
the hydraulic pump to apply some load on the
engine.
9. Inspect the fuel piping and devices for fuel
leakage.
a Check mainly around the high-pressure
circuit parts coated with the color checker
for fuel leakage.
a If fuel leakage is recognized, repeat the
procedure from step 1 after repairing the
leakage.
a If no fuel leakage is detected, check is
completed.
To Next Page
Loading...
Need help?
General
