Komatsu SAA6D114E-3 - Testing fuel system for leakage

SEN00455-01 30 Testing and adjusting
22 114E-3 Series
Testing fuel system for leakage 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 any fuel leakage is detected, repair it
and inspect again from step 2.
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 any fuel leakage is detected, repair it
and inspect again from step 2.
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 any fuel leakage is detected, repair it
and inspect again from step 2.
8. Run the engine at high idle and load it.
a When checking while the components to
be checked are mounted on the machine,
stall the torque converter or relieve the
hydraulic pump.
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 any fuel leakage is detected, repair it
and inspect again from step 2.
a If no fuel leakage is detected, check is
completed.