4TNV98 Diesel Engine Assembly For Excavator SWE70 Water Cooling
Specification
| Car name: Complete Engine |
| Model Number: 4TNV98 |
| Cylinder stroke: 110 |
| Application: Excavator |
| Cylinder diameter: 98 |
| valve: 16 valve |
| Cooling: Water cooling |
| Output: 53.1kw |
| Injection: Direction |
| Cylinders of number: 4 |
Description
Function of Engine parts
Plumbing
The cooling system has a lot of plumbing. We'll start at the pump
and work our way through thesystem. The pump sends the fluid into
the engine block, where it makes its way through passages in the
engine around the cylinders. Then it returns through the cylinder
head of the engine. The thermostat is located where the fluid
leaves the engine.
The plumbing around the thermostat sends the fluid back to the pump
directly if the thermostat is closed. If it is open, the fluid goes
through the radiator first and then back to the pump. There is also
a separate circuit for the heating system. This circuit takes fluid
from the cylinder head and passes it through a heater core and then
back to the pump.
Fluid
Cars operate in a wide variety of temperatures, from well below
freezing to well over 100 F (38 C).So whatever fluid is used to
cool the engine has to have a very low freezing point, a high
boiling point, and it has to have the capacity to hold a lot of
heat. Water is one of the most effective fluids for holding heat,
but water freezes at too high a temperature to be used in car
engines.
The fluid that most cars use is a mixture of water and ethylene
glycol (C2H6O2), also known as antifreeze. By adding ethylene
glycol to water, the boiling and freezing points are improved
significantly. The temperature of the coolant can sometimes reach
250 to 275 F (121 to 135 C).
Even with ethylene glycol added, these temperatures would boil the
coolant, so something additional must be done to raise its boiling
point.
The cooling system uses pressure to further raise the boiling point
of the coolant.
Just as the boiling temperature of water is higher in a pressure
cooker, the boiling temperature of coolant is higher if you
pressurize the system. Most cars have a pressure limit of 14 to 15
pounds per square inch (psi), which raises the boiling point
another 45 F (25 C) so the coolant can withstand the high
temperatures.
