![]() Do not use an abrasive pad in a drill to whiz off or clean the head or block surfaces because doing so may also remove metal and create shallow depressions that can prevent a new head gasket from sealing. After removing the old head gasket, carefully remove any residue from the head and block using a gasket removal chemical and scraper. Replacing a head gasket is a big job, so avoid making any mistakes that could prevent the gasket from sealing properly. The MLS head gaskets are made of several layers of embossed stainless steel and are much stronger than the OEM gaskets that were originally used. Some aftermarket gasket suppliers now offer MLS replacement head gaskets for older import engines that were originally equipped with composite or graphite head gaskets. Installing a redesigned aftermarket gasket with improved combustion armor and an anti-stick coating should provide a long-lasting fix. On older Toyota 3.0L and 3.4L engines, excessive head motion is also a leading cause of gasket failure. The fix is to replace the OEM head gasket with an improved and redesigned aftermarket head gasket that has stronger combustion armor, better materials and an anti-friction coating that can handle the movement. If the head gasket can’t accommodate the movement, or lacks any built-in lubricity (such as a non-stick coating), thermal expansion and contraction can literally tear the head gasket apart as the miles accumulate. Aluminum expands at a much higher rate than cast iron, which causes the head surface to move more than the block surface. The cracking occurs as a result of metal fatigue caused by the head scrubbing back and forth on the block because the engine has aluminum heads and a cast-iron block. In the case of the Mitsubishi 3.0L V6, the armor around the combustion chambers on the OEM gasket has a tendency to crack. You may withdraw your consent at any time by clicking the unsubscribe link contained within all of our commercial electronic messages or by updating your preferences with us. The 1988-’95 Toyota 3VZE 3.0L V6 light truck engine, and 1995-’98 Toyota 5VZFE 3.4L V6 in T100s, Tacomas and 4Runners are all examples of engines with hard-to-seal heads and frequent head gasket failures. Yes I would like to sign up to receive emails or other types of commercial electronic messages on the latest product announcements, promotions, service specials and more from Subaru Canada, Inc. Some head gasket failures can be blamed on the design of the cylinder head and the way it loads the gasket. ![]() TTY head bolts stretch when tightened and should not be reused because they may break or fail to maintain torque. If you end up replacing the head gasket, don’t reuse the original head bolts because they are torque-to-yield (TTY) bolts.
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