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I wanted to check the integrity of my o-ring seals before I finished my 2L
engine build. So I assembled the engine just far enough to do so. The head was
on along with the front cover and H2O pump. I then temporarily installed
the TA and hooked up the radiator. I used a piece of hose to connect the heater ports together. I then borrowed a cooling system pressure tester to pressurize the system (after filling with H2O of course). After 1 hour at
11 PSI I saw no signs of leakage. Now to finish up assembly!
 

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Looking good!

My eL-cheapo version is to use a bicycle inner tube. Cut the inner tube opposite the valve stem and hook up the two cut ends to whatever you are testing. Add air via the valve stem & the inner tube inflates pressurizing whatever you are testing. Not as precise as your test but it does the job.
 
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