Komatsu SDA6D140E-3 - Page 355

140-3 SERIES
13-53
DISASSEMBLY AND ASSEMBLY GENERAL ASSEMBLY OF ENGINE
49. Method for checking fuel high-pressure pip-
ing for fuel leakage after assembly of engine
★ If high-pressure fuel supply pump (2), com-
mon rail (1), or high-pressure pipe is re-in-
stalled, check the engine for fuel leakage.
★ Clean and degrease the engine so that fuel
leakage can be detected easily.
1) Spray color checker (developer) to the joints
of the fuel supply pump, common rail, fuel
injector, and high-pressure pipe.
2) Start and run the engine at speed below
1,000 rpm. Stop the engine after its rotation
is stabilized.
3) Check the fuel piping and devices for fuel
leakage.
★ Mainly check the parts sprayed with the
color checker for fuel leakage from the
high-pressure circuit.
★ If any fuel leaks, repair and repeat the in-
spection from step 2).
4) Start and run the engine at low idling.
5) Check the fuel piping and devices for fuel
leakage.
★ Mainly check the parts sprayed with the
color checker for fuel leakage from the
high-pressure circuit.
★ If any fuel leaks, repair and repeat the in-
spection from step 2).
6) Start and run the engine at high idling.
7) Check the fuel piping and devices for fuel
leakage.
★ Mainly check the parts sprayed with the
color checker for fuel leakage from the
high-pressure circuit.
★ If any fuel leaks, repair and repeat the in-
spection from step 2).
8) Start and run the engine at high idling and
apply a load to it.
★ If the engine is mounted on the machine,
stall the torque converter or relieve the
hydraulic pump.
9) Check the fuel piping and devices for fuel
leakage.
★ Mainly check the parts sprayed with the
color checker for fuel leakage from the
high-pressure circuit.
★ If any fuel leaks, repair and repeat the in-
spection from step 2).
★ If any fuel does not leak, finish the in-
spection.