Operation and Maintenance Manual for PowerKit 6M16 Series
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Recommended 5-step method for tightening the fuel inlet joint:
1) Insert the injector into cylinder head. Ensure that the injector is correctly placed and contacts
with the seal ring correctly, and then tighten the clamping bolt of injector to 3Nm.
2) Loosen the clamping bolt to make the axial force acting on the injector equaling to zero, and
ensure that the injector is located correctly in the cylinder head.
3) Pre-tighten the high-pressure fuel inlet joint (nut) to the torque of (15~20) Nm. This torque is
essential for rotating the injector to align with the fuel hole.
4) Tighten the injector clamping bolt to the torque of 8Nm, and then turn an angle of 90°.
5) Tighten the high-pressure fuel inlet joint (nut) to the torque of (50~55) Nm.
Notice: High-pressure fuel inlet joint, O-ring and seal gasket can be used only once.
2.4 Cooling system
The function of cooling system is to ensure that the diesel engine can operate continuously at the
suitable temperature. The forced circulating cooling provides the best guarantee for achieving the
operating temperature promptly. The circulation of cooling system is as shown in figure 2-5. The
cooling system mainly consist of water pump, intercooler, cooling water chamber of diesel engine,
oil cooler, thermostat, water pipe and fittings. The circulating water is used mainly for cooling
engine oil and the diesel engine, and to ensure continuous operation of the diesel engine at
appropriate temperature, the water circulation is divided into long circulation and short circulation.
When the water in the diesel engine is at low temperature, the thermostat is closed, and cooling
water enters the water pump of the diesel engine through the thermostat to increase the water
temperature rapidly. When the water temperature reaches to 76°C, the thermostat opens and the
cooling water enters the radiator for cooling.
