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Heli-Coil /// Sav-A-Thread /// Stripped Threads
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<blockquote data-quote="Triple obsession" data-source="post: 348408" data-attributes="member: 13153"><p>Some folks do have good luck with them, but many don't. In the winter I work at a automotive machine/race engine shop & we use only heli-coil inserts. We've tried "save a thread" in the past and weren't impressed & we have had a few customers come in that had problems keeping them in.</p><p></p><p>Most high temp thread locking agents are only good for 500-650 degrees, once they reach that temp they break down & loose their bond. Heating & cooling cycles can affect them as a aluminum head & the steel insert have different expansion rates. If you have a exposed thread on the end of the plug & carbon gets built up on it the insert can get backed out when the plug is removed.</p><p></p><p>Keensert makes a good insert similar to the napa ones except they have vertical groves on the side with steel pins that stick up. Tap & install then use a special tool to drive the pins down into the threads locking everything together. Good, but a little pricey.</p></blockquote><p></p>
[QUOTE="Triple obsession, post: 348408, member: 13153"] Some folks do have good luck with them, but many don't. In the winter I work at a automotive machine/race engine shop & we use only heli-coil inserts. We've tried "save a thread" in the past and weren't impressed & we have had a few customers come in that had problems keeping them in. Most high temp thread locking agents are only good for 500-650 degrees, once they reach that temp they break down & loose their bond. Heating & cooling cycles can affect them as a aluminum head & the steel insert have different expansion rates. If you have a exposed thread on the end of the plug & carbon gets built up on it the insert can get backed out when the plug is removed. Keensert makes a good insert similar to the napa ones except they have vertical groves on the side with steel pins that stick up. Tap & install then use a special tool to drive the pins down into the threads locking everything together. Good, but a little pricey. [/QUOTE]
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