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Home > Video > Video Display > How to use the OEM engine block tester to test for blown head gaskets or cracked cylinder head

How to use the OEM engine block tester to test for blown head gaskets or cracked cylinder head

This simple tester can be taken out on loan from AutoZone for 20 bucks and it takes about 5 to 10 minutes to determine if you have a blown head gasket this is my first attempt using one of these and I demonstrate some of the common issues you might encounter like I have.

There's not a lot of explanation in the video but to keep it short I'll just tell you right here make sure you lower the radiator fluid down at least two to three inches as the instructions state and pull on the bulb slowly and release the bulb slowly not too rapidly so as not to pull antifreeze into the tester if the test fluid stays Blue your headgasket is good if it turns yellow then you have a blown head gasket simple as that. 

Key Tip: Release the bulb slowly for 2 minutes with engine warm and running.  Watch the fluid level on the tester if you see the level increasing you know you're sucking coolant into the tester which will contaminate the test and you will have to repeat.
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