Auto Service Professional

JUN 2016

Magazine for the auto service professional

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46 | ASP June 2016 Technical Use these tips to obtain superior gasket sealing Avoiding leaks requires precision work By Mike Mavrigian E ngine leaks are both annoying and potentially lead to engine damage and failure. In this brief article, we'll discuss ways to obtain proper sealing of oil, coolant and engine vacuum, while also providing an overview of various gaskets and sealing materials. Mating surface condition When cleaning mating surfaces prior to the installation of new gaskets, avoid the use of any hard metal scraper which can gouge or scratch the surfaces. Tis is especially true when dealing with aluminum surfaces such as cylinder heads, timing covers, oil pans, water pumps, etc. Aluminum alloy used on production engines is relatively soft and can easily be damaged with the careless use of a steel scraper. Heavy scratches, nicks, burrs or gouges can create fuid escape paths, even when assembled with the highest quality gaskets. Also, in order to avoid uneven or wavy surfaces, avoid the use of abrasives driven by a power tool, such as a die grinder or drill ftted with sandpaper or Scotchbrite pads. Even though the surface may appear shiny and clean, unpredictable control of a hand- held power tool can easily create an uneven and wavy surface that will prevent a perfectly parallel surface-to-surface sealing. Pay attention to OE specs Depending on the design of a particular engine, the use of a gasket or rubber/synthetic seal may or may not be required for certain component areas. If the mounting of a component was designed to use a form-in-place sealant instead of a pre-formed gasket, the use of a gasket, due to the gasket thickness, can result in misalignment of one component to another, positioning a component further way from its mating area. Tis can result in bolt hole misalignment as well as leaks. By the same token, a component which Finding and sealing leaks can be time-consum- ing and frustrating. Whether it is a fuid leak or an exhaust leak, taking the proper steps are necessary to do the job right. This article will give you tips and advice. However, there are two commandments that you must always follow when trying to seal a leak. Always know and follow the OEM's specs, and always use the correct sealant AFTER THOROUGHLY READING THE INSTRUCTIONS! Sealant manufacturers sometimes change ingredients and usage procedures, so don't "assume" that you know how to use the sealant.

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