Q&A for How to Fix a Head Gasket With Engine Block Sealer

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Is this the most economical way to fix a cracked head gasket?

Community Answer

There is no economical way to actually fix it unless you have the ability to remove the head and replace the gasket yourself. If you are handy and get a how-too book, it can be done. Some temporary fixes are inexpensive, but they are not permanent, and don't always work well.

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Question

Will Blue Devil temporarily fix a cracked head?

Community Answer

Blue Devil worked great for me temporarily. Eventually, I did have to replace the gasket.

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Question

In the final step, why is a less antifreeze/water ratio better?

Community Answer

While radiator coolant (anti-freeze) properties are great to prevent corrosion (radiator and block) and freezing or over-heating issues, it plays havoc on the head gaskets and is extremely corrosive on the gaskets.

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Question

The old sealant gave way and the coolant turned brown. Is it oil or combustion products in the coolant if the gasket gave way?

Community Answer

If it has the appearance of a Wendy's "Frosty" ice cream, it is engine oil.

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Question

Will an additive work on a vehicle with over 100,000 miles on it?

Community Answer

The determining factor on whether or not the block sealer will work is usually the severity of the leak in the head gasket, not the age of the vehicle. If the leak is small, it should work.

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Question

If oil is blown back onto the engine exhaust, is that evidence of a leaking head gasket?

Community Answer

That would possibly indicate a bad PCV valve.

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Question

Why do I have a yellowish foam in my oil?

Community Answer

It is likely coolant has gotten into it. If the weather is cold, you may see a small amount of foam under the oil cap. This is caused by condensation and is normal. If the car gets long runs and there's still a lot of foam, then it's a coolant leak.

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Question

Can engine block sealer blow up an engine?

Community Answer

Potentially, yes, if it's not applied properly. Just pouring it into the system and not letting it circulate thoroughly will just let it amass in the radiator or heater, so it can block a channel, leading to overheating.

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Question

Will head gasket sealer be okay if my head gasket isn't broken?

Community Answer

You shouldn't do this. It could potentially block any narrow coolant channels, such as in the heater matrix. If you really need to use a sealer, make sure you run the car for a good distance to get it fully spread throughout the cooing system, rather than accumulating in any one part.

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Question

What can I do to reverse my error to avoid blockage if I forgot to remove the thermostat and poured the sealant in?

Community Answer

Remove the cylinder head, drain all fluids, and clean all cooling passages.

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