Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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to the following points:
z If the engine is working or at the starting speed, it is not allowed to check for any single cylinder failure by the
way of disconnecting the fuel injector harness.
z If the engine needs to be dragged but not started by the starter, such as when you check the engine cylinder
pressure, the harness plug should be disconnected from the crankshaft position (engine speed) sensor and
camshaft position (phase) sensor. After inspection, all sensors should be well connected and system DTCs should
be cleared by using the special diagnostic instrument for JAC commercial vehicles.
z It is not allowed to touch the engine gear train and rotating parts when the engine is at high speed;
z When the engine reaches normal operating temperature, the coolant temperature and pressure of cooling system
is very high; therefore, stop the engine and let the cooling system fully cool down if it is needed to repair the
engine cooling system.
z If the engine compartment relevant maintenance is necessary to be conducted in repairing engine fuel system,
please do it after the engine compartment is fully cooled down.
z Don’t touch the engine cooling fan at any time when the system is normally electrified, for the cooling fan is
likely to be started suddenly.
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