Pressure cap description (Harley V-Rod VRSCA)

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The pressure cap and radiator filler neck pressurize the coolant system. The pressure cap’s upper spring diaphragm gasket seals to the upper sealing seat in the filler neck. The lower pressure limiting valve in the pressure cap seals to the lower seat. The filler neck has an overflow tube between and upper and lower sealing seat.

Rising pressure compresses the spring and the lower valve opens. Excess pressure and expanded coolant flow to the overflow bottle through the overflow tube. When the pressure drops, the vacuum valve opens to draw coolant back into the radiator through the overflow tube from the overflow bottle.

Figure 6-2. Pressure cap: 1. Upper sealing gasket; 2. Spring diaphragm; 3. Lower sealing gasket; 4. Vacuum valve

Figure 6-3. Filler neck: 1. Upper sealing seat; 2. Safety stop; 3. Cam; 4. Overflow tube; 5. Lower sealing seat

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Article about repair motorcycles «Harley V-Rod VRSCA» (2002-2006): «Pressure cap description»: https://motoinstruction.ru/en/Harley/V-Rod/VRSCA/engine/cooling/110535 <a href="https://motoinstruction.ru/en/Harley/V-Rod/VRSCA/engine/cooling/110535">Pressure cap description</a> - article about repair motorcycles «Harley V-Rod VRSCA» (2002-2006) from section «Cooling and lube system». [url=https://motoinstruction.ru/en/Harley/V-Rod/VRSCA/engine/cooling/110535]Pressure cap description[/url] - article about repair motorcycles «Harley V-Rod VRSCA» (2002-2006) from section «Cooling and lube system».