Quote from RotaryResurrection.com:
"Remove your coolant fill cap, and fill the system up as high as possible. Leave the cap off. Remove your EGI fuse to prevent start-up. Have an assistant crank the car with the throttle open for several seconds. Observe the open coolant hole for air bubbles or excess pressure pushing water out. Any pressure or air bubbles (consistent) observed indicate compression pressure being pushed into the coolant system past the seals, since the water pump is not spinning fast enough to do anything and there is no other explanation. Passing this test does not necessarily guarantee the lack of a seal failure, but it goes a long way in easing my mind. Failing this test pretty much guarantees a failure internally."

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