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