Dorman 42025 Cylinder Head Repair Kit Compatible with Select Ford / Lincoln Models

I bought my kit for a 1999 Ford Expedition 5.4L. I like that it was simple to use. After watching some YouTube videos on it I decided on this one because of the price and speed of receiving it. I was going to get the more expensive kit but I'm very satisfied with this Dorman kit. The plug that blew had prior sleeve (slimmer and cheaper looking) from another manufacturer.I ended up getting second kit but from O'Reilly's or AutoZone because I needed it right away on a different day, because I blew another plug. The one I got from the store was 60 bucks tho so almost double what it cost on Amazon.Definitely recommend keeping a kit in your truck for emergencies.Also a quick tips1) I recommend using JB weld 8265s because of the high temp rating and I feel it'll bond better than the loctite. The JB weld has a tensile strength of 5020 PSI and can withstand temps up to 550° F.2) use a slim socket to make sure it fits in the sparkplug hole. I lubbed up the exterior of the socket so it wouldn't get stuck and put a little bit of electrical tape inside where the extension mates up with it to guarantee that it doesn't stay behind after tightening the sleeve.3) make sure you watch more than just one YouTube video even if it's not for this sleeve kit because you'll find tips and learn how it works and how others won't work.4) I recommend waiting at least 4 to 6 hours until the JB weld has time to cure a little. I made the mistake of running the engine too early and it had some blow-by. The sleeve held for the 8 miles I drove it but the JB weld burned off. So I guess if it's an emergency and you don't have JB weld or loctite it can get you a few miles down to get some or help.I had to pull the sleeve back out, wire brush it and re-apply JB weld. it held after letting it sit for about 6 hours.A video said that you can get back on the road in 30 minutes using high temp loctite. I just felt like JB weld was a better idea. I'm no mechanic just a do it yourselfer.

99 Ford Expedition 5.4Been having one on for three years and hasn’t blown out. Installing another one on a different cylinder now. Used loctite on adapter and let it sit over night. Been working like a charm

2001 Ford 5.4 Triton... 4 stars because in theory this is the easiest fix for a blown out plug and avoids drilling the head. The spark plug/boot design is neat too. But I had a few problems with installation.A few reviews mentioned socket selection but I underestimated how critical this is. On my first attempt I ended up with a socket stuck to the adapter in the spark plug well which took hours to remove. YMMV, but most of my 17mm sockets fit into the spark plug well fine but were too snug on the adapter. Most 11/16 sockets fit the adapter nicely but were too large to fit into the well. I ended up using an old socket that was loose enough on the adapter and then spun it against a bench grinder to get the outside diamter small enough for the well. I put a small magnet inside to hold the adapter in place while threading in initially. Use a short socket so downward force can be applied while threading in.I didn't get the adapter set deep enough on the first try and had some ticking during warm up. But I also didn't wait long enough for the thread sealant to cure (used permatex high temp thread sealant rather than actual thread locker) which was probably part of the problem too.I was able to back the adapter out and reuse it. On the second try I applied more sealant, cranked it down a bit deeper (as hard as I could with a medium length ratchet) and let it cure 3 days before starting. Seems to have sealed up well this time, I'll report back if there are any problems in the future.

I'm glad it worked its the only thing that did work and I tried many different tools

The first time I used the kit , I was gun-shy because I heard that people had the insert break or it didn't seal right , or don't over tighten it . So I was too careful in my threading it into the head . Also I used the Red Locktite that is supposed to seal the threads and be permanent. But in my carefulness I didn't get the insert threaded all the way in. And two days later it started ticking and leaking combustion gasses into the plug well. So I removed the insert , cleaned it up and using JB weld rethreaded it in this time using more torque making sure it was bottomed out. Gave it 24 hrs plus to set up the JB weld. Installed the provided spark plug . Put all back together and Praise God it worked like a champ ! Still going great with nearly 20,000 miles on the repair and it seems as permanent a repair as ever. Bought an extra one as insurance that no others will blow out ! Great product just make sure you get the insert seated and use JB weld to seal the threads 👍.

Lasted about a year before cracking and blasting out again, well, at least the top half with spark plug. Quite rusty as well. I say inconsistent manufacturing and its weak spot, the midway or transition point. Now I have to get that piece out and get a real kit, the time sert n do it right. For those doing a quick fix and sale this would do the trick. I am sure others got more time n miles as well as less time n miles. About a year for me and less than 3k miles. No good. Made more work for me. Junk.

I don't like how the spark plug does not sit well on insert. Air gets through.

Triton engine threw a plug, second in on the drivers side. Thin walled 17MM socket got it in there and a locking 6" socket extension with tape on the release collar so that it would engage with the socket, got the socket back out. I used loctite on the adapter and anti-seize compound on the plug threads. Replaced the coil pack & changed out the coil pack wire with the one that comes in the kit. It worked! 100%. I've driven 100 miles on it thus far with no issues. This is the way to repair a blown Triton motor spark plug. I bought a second set, with the tools and keeping it all in the truck so that if this should occur again I'll be able to fix on the roadside in an hour and be back on my way. Love it!