K4N Diesel Used Engine Heads For Excavator E305 Water Cooling
Specification
| Item: Engine cylinder head |
| Engine Type: Diesel |
| Application: Excavator |
| Injection: Direct |
| valve: 8 valve |
| Cooling: Water Cooling |
| Number of Cylinders: 4 |
| Model: K4N |
Description
What Causes a Cracked Cylinder Head?
Failed Water Pump
If the water pump fails, coolant won’t be able to circulate through
the engine properly. The coolant in the radiator may be nice and
cold, but the coolant surrounding the water jackets in the head and
block will be extremely hot.
Without a pump, coolant will only be able to circulate via the
natural convection process, which is much too slow to remove excess
heat before the engine overheats.
Failed Thermostat
Combustion engines are most efficient when they are running at the
operating temperature they were designed for.
An engine’s normal operating temperature is still plenty hot enough
to scald you – typically around 190 to 210 degrees Fahrenheit (85
to 99 degrees Celsius). Running the engine below this temperature
increases fuel consumption, emissions, and wear.
A thermostat blocks off coolant from the radiator until the coolant
in the engine reaches the target temperature. Once the target
temperature is reached, the thermostat opens to allow coolant at
ambient temperature to enter the engine, cooling it until the
thermostat is cold enough to close. The cycle continues as the
engine runs.
If the thermostat is stuck open, your car will probably run pretty
cold. This is because the coolant from the entire system is cycling
through the radiator 100% of the time and rarely gets a chance to
fully warm up.
If the thermostat is stuck closed, your engine will overheat pretty
easily. The hot coolant has nowhere to go to cool off. In a pinch,
some engines allow you to use the heater as a tiny radiator.
The effectiveness of this method depends on the size of the heater
core and how the cooling system is routed.
Conclusion
A damaged cylinder head can be repaired. However, there is no point
in fixing a head whose lifespan is over. It will still crack or
warp almost immediately after. Cylinder head replacement offers a
better solution. But then, not many people understand how to do it,
or even when.
