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How to pressure test a 4 pass ally radiator for leaks?


anthonym

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Use short pieces of hose and suitable plugs for the hoses such as plastic plumbing blanking plugs, with hose clips to keep them in place. Through one plug insert a rubber Schraeder tyre valve stem. Fill the radiator as full as possible with water, then increase the pressure up to 1 bar with a tyre pump on the Schraeder valve. Confirm the pressure stays for at least an hour without any leaks.

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"Use short pieces of hose and suitable plugs for the hoses such as plastic plumbing blanking plugs, with hose clips to keep them in place. Through one plug insert a rubber Schraeder tyre valve stem. Fill the radiator as full as possible with water, then increase the pressure up to 1 bar with a tyre pump on the Schraeder valve. Confirm the pressure stays for at least an hour without any leaks."

Agreed, except that is easier and quicker to pump air only into the radiator and then immerse it in water, obviously looking for air bubbles.

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Quite true, but it's not necessary to use more than a few psi to find an air leak. And it gives a visual indication rather than having to wait for the pressure to change - plus it can be done with a bicycle pump if you don't have a compressor. This is how we used to test all radiators, intercoolers, oil coolers, etc.

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