Go up to the cap release pressure (roughly 21psi). However if your planning on testing ideally you'd want 21psi at operating temperature. A cold test will prove any major leaks but may not show hairline cracks or pin holes that open at higher temperatures.
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How to view a car - everything you need to help you inspect a used car
VIS motor tester avalible to local members
Injector removal tool and auto gearbox pressure tester now available
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