Ask the Mechanic

Steve Thompson, Contributing Columnist

READER: When replacing the head on an engine after head work, do you recommend using some kind of sealer on the head gasket?

STEVE: I am a big fan of a product called copper coat. It is available at most auto stores, and I have found it to be a great product. After spraying a thin coat on each side of the head gasket, torque the head as the engine manufacturer suggests. The amount of torque and the torque pattern and sequence are very important. If you don't know the specifications for your engine, find them in a tech manual, from a dealer for that product or online. Don't guess, or it can cause a future headache.

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-- Email Steve Thompson care of askthemechaniccolumn@gmail.com, and be sure to include your contact information and phone number.

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