39
Fault mode 5˖Liable misfire or unsteady speed
Possible cause Correction
Fuel level in the fuel tank too low Add fuel
Air in fuel system
Check for air in the system. Tighten or replace the
fuel joints, fuel pipes if necessary and then prime
the system
Fuel pressure too low
Check the fuel tank for fuel level, check the pipe
between the tank and the fuel transfer pump for
leakage, serious deformation, bent or plug and for
air
Leakage at high-pressure fuel pipe connectors Tighten the connectors and make replacement if
required
Injection pump timing is not correct
Check and adjust injection timing. Refer to 5.2 for
the procedure
Intake/exhaust valve clearance error (s) Check and adjust valve clearance
Fault mode 6˖Liable misfire at low speed
Possible cause Correction
Fuel level is low in the tank Add fuel
Air in the low-pressure fuel pipeline
Check the low-pressure fuel pipeline for air source.
Tighten or replace joints or pipes if necessary and
then prime the system
Fault mode 7˖Engine cannot reach rated speed with load
Possible cause Correction
The load is too heavy Reduce the load or shift to lower gear
The drive system has been changed and cannot
match the engine
Check the transmission gears for mismatch of the
engine
Fault of the tachometer or speed sensor
Check the tachometer and speed sensor, and make
replacement when necessary
The resistance of fuel inlet is great
Check the fuel filter and fuel suction pipe and
replace the fuel filter if necessary
Fault of the turbocharger Check the boost pressure
Leakage in the intake system
Check the connection of intake manifold, intake
pipe, intercooler, its pipeline for looseness or
leakage
The resistance of intake system exceeds the
specified value
Check the intake system resistance and replace the
air filter element if necessary
Fuel fails to meet required specification or its
quality is poor
Use the fuel specified in this manual and fill a
temporary tank with right high-quality one, with
which to run the engine and verify the fuel issue
To Next Page
Loading...