Quote:
Originally Posted by 97 SL320
The only reliable way to test for combustion chamber to coolant leaks is to do a cylinder leak down test. This is where you remove a injector or glow plug, install an air hose, turn the engine to piston at top , both valves closed then apply about 100 PSI air. Keep the radiator cap off and look for coolant rising or bubbles.
The chemical test you are doing is for a quick test only, doing a leak down on every cylinder is the only definitive test.
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Leak down test is not to check cooling system integrity if I understand correctly. It is to check the rings and cylinder wall. Also it is only 20psi. Am I missing something? No way you will see air bubbles at 100psi, even much more.