The top portion of the radiator cap will list the pressure rating.
Radiator cap pressure relief valve.
If an individual expansion tank is installed which is mostly the case today the expansion tank cap is equally important.
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They will prevent excessive pressure.
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Locate the system s pressure rating on the top of the cap.
This valve is used with speedway s aluminum t bucket radiator 91015600.
The pressure cap also prevents radiator hoses and tanks from collapsing.
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Test the cap with a radiator pressure tester and a special adapter.
The radiator cap acts as a release valve set to open at the maximum pressure point.
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Always use a cap of the correct pressure for your cooling system.
The arrow on the valve indicates the flow.
Both the pressure relief and vacuum relief valve must be easy to lift and spring.
Air causes poor engine cooling and is the main cause of cooling system component corrosion.
It threads into a 1 4 npt hole in the top radiator tank and it limits the pressure in the radiator to 15 psi.
This valve allows for contraction as the fluid cools.
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The cap acts as a pressure relief valve.
The radiator filler neck has an overflow tube right between the two sealing surfaces.
If the cap s spring is weak it is.
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Unchecked high pressure could cause damage to the radiator heater core hoses or water pump seal.
Usually this is set at a density of 15 pounds per square inch psi.
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The aluminum t bucket radiator does not use a conventional pressure radiator cap rather it uses the decorative t caps to seal the neck at the top of the radiator.
If there were not a radiator pressure cap installed the system would draw in air.
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Where to find the pressure rating.
As the engine cools it causes a vacuum in the cooling.
High pressure radiator cap.
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The pressure relief valve spring is compressed against the lower seal when you lock the cap.
When the fluid pressure inside the radiator exceeds 15 psi it forces the valve open allowing heat to escape and excess coolant fluid to overflow into the tanks on either side of the radiator.
Radiator caps also serve as pressure relief valves.
As the vacuum continues to build up the two way check valve which is exactly what a radiator pressure cap is goes to work.
