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Head bolt issue

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Hi everybody. I've been having a problem with the head bolt by the exhaust valve staying tight. It did strip and I installed a Helicoil in it and after a week it is loose again and will not tighten. Anybody know what to do next?

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Not sure if you can use this. Maintenance at work use these all the time. They call them King Serts at work. http://www.youtube.com/watch?v=zHX6jLlxDmU

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Thanks for the link Ray. I just got it put back together. I stacked two Helicoil's on top of eachother and torqued it down, seens to grab alot better so we'll see how it holds

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I use the ones Ray refers to all the time, much preferred over helicoils. They are actually called keen serts if you want to look up info on them. One thing to know about keen serts is that when you open up a hole to install one, you don't use the standard drill for the tap, you use a bigger one. The thread on the outside of keen serts isn't cut to a standard depth, not sure why they do that. You can find charts online to give drill sizes for different size inserts, or usually the inserts have a paper in with them giving the drill sizes. Helicoils aren't bad for an application that you tighten once and leave alone, but if it is an application where you often take out the bolt, the helicoil will eventually unscrew out of the hole, which is why I prefer keen serts. http://www.newmantools.com/kee.htm Hope this helps! Steve

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