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This article is in video format at the bottom of the page! How severely can a spark plug hole in an aluminum engine head, which previously had a repair insert and has since blown out, making the hole bigger and showing signs of erosion, be damaged and still be fixable? Basically, there needs to be enough material to ream or drill out so that complete threads can be tapped to accept an oversize spark plug insert. The image above shows a spark plug hole after a Napa Fix-A-Thread insert failed, lea …

DennisB WiseAutoTools.com © Summary: Why it is so important NOT to drill or tap before making sure the valves are closed. When it comes to spark plug thread repair, a common misconception is that the piston "being down" is the only concern. Below is part of a recent email conversation I had with a customer preparing to fix his spark plug threads.Dennis. I have a few more questions if you have the time. I don't have an air compressor so I won't be able to use the leak tester to find bottom d …

DennisB WiseAutoTools.com © Summary: Ford’s are by far the vehicle that has the worst track record when blowing spark plugs out due to failed aluminum threads. This repair article is written by a Master Tech that has been helping auto repair shops and vehicle owners repair spark plug threads in Fords for many years. The article reveals which spark plug thread repair kits are worthwhile and which ones are just a waste of money that ultimately make the hole bigger and uglier! Brands covered are Fu …

WiseAutoTools.com © Summary: This is one of our more extensive articles on spark plug thread repair. If you need answers fast to get a vehicle up and running quickly we understand. No time to read? We’ve got answers, give us a call at 800-734-8665 x251. To continue some research by reading 10-15 minutes see below. Ford spark plug blowout repair using a kit over the fender. Most common engines that have the problem are Ford 4.6, 5.4 & 6.8 liter engines, although any engine can have …

DennisB WiseAutoTools.com © Summary: We’ve been selling spark plug thread repair kits for many years to vehicle owners and repair shops for Ford spark plug blowout repair. We answer frequently asked questions and go over concerns regarding common misconceptions. Although other vehicles can have a sparkplug blowout or ejection problem, this article is primarily on 1996 to 2012 Ford 4.6, 5.4 and 6.8 engines. The most common kits we sell are the Calvan 38900, the TIME-SERT 5553 and the l …