Helicoil 4833 Oxygen Sensor Thread Repair Kit M 18 x 1.5

Great product and saved me hundreds of dollars and time. My O2 sensor was extremely difficult to remove and when I did finally get it removed the threads were a mess. I tried an 02 thead chaser first ( 18mm x1.5 thread) and also tried a tap to clean up and refurbish the threads. Spent 3 + hours on that and screwed up the new O2 sensor. I was looking at a new exhuast manifold at that point but did a bit more research and found this kit. It worked like a charm. The kit has a ream to cut the new threads - which as good as it is- this is still an exercise in strength so you may need a breaker bar or extension in the breaker bar to cut the threads in steel manifolds.

I cross threaded an 02 sensor in a brand new, (of course), Y-pipe with 2 Cats for my truck. After trying a thread chaser tap, there simply was not enough material left to bolt up a new 02 sensor. This kit worked very well but was expensive. Compared to the cost of another Y-pipe W/Cat converters it was cheaper. Since this is for such a specialized use, I guess Helicoil charges whatever they want. But I do have the kit if ever needed again and it comes with several extra coils for future repairs.

The threader was impossible to get straight and aligned properly. Hard to start. Ant the "re-threads" would never fit right into the hole. Went through all of them. Ended up taking the manifold off and to a local welder. He welded a new O2 sensor "bung" that I had ordered onto/over the existed striped out one. Solved the problem!

This was a real money saver. What was supposed to be a 30 min job turned into a nightmare when the O2 Sensor came out with no threads on it. Not sure if it had just seized up or was put in stripped but it left a real mess on the original threads. Once I drilled out the old threads this baby did exactly what it was designed to do. Took about 20 min to drill and tap it but I was in no rush. Put the new O2 sensor in and works like a champ. It is a very simple tool to use but it does require a 23/32" drill bit if you have to drill out the old threads. Didn't know that until after I had received the product. It was a hard size to find so I ended up ordering mine on Amazon for about 10 bucks. Overall great solution for an expensive problem.

This kit worked easier than expected as this was my first helicoil job. I am mechanically inclined and had an old bolens large frame tractor I was repairing. It had an old Wisconsin s14d engine that wouldn't run. I found that the spark plug hole was stripped and need replacement or repair. I used this kit even though it's for o2 sensor because it's the same thread dimensions for oem spark plug. I did not use a drill to open hole since the head is aluminium. The cutting bit included did fine with some motor oil drizzled on by hand. Then the helicoil went in fine. The repair to cut helicoil literally to about 15-20min including me double checking everything since it was my first on. The engine has been reassembled since Feb 2015 and is still running strong and fine. The only reason I didn't give five star was the price. If the cylinder head wasn't a rare one like this one I would have just bought used cylinder head for cheaper.

Way over priced for what you get; at this price it should include a 23/32 drill. But being helicoil fit and finish are top notch. Unfortunately, my mileage varied with this one - probably just luck of the draw. Being in NY, and working on cars here, I use helicoil kits a lot since most fasteners seize into place, or just come out with stripped holes from the salt rust. I've also broken a lot of taps in my life as well, but never like this. Taps usually shatter, or break in half; the tap that came with this kit, instead of cutting a thread, had the teeth break off on first use. Going to see if I can get a replacement tap to finish the job, and if it still sucks I'm going to go get my money back.

Makes repairing catalytic converters a breeze!

These were more difficult to use than I expected. Smaller Helicoil’s that I’ve used in the past worked pretty easy. I guess because of the larger size they’re installed a little differently. Attaching the helicoil to the installation tool is not intuitive. At first you swear that it can’t fit. I wasted 2 coils trying to get it onto the install tool. Very carefully and slowly the helicoil does screw over the threads of the install tool. The tap that came with the kit was good. Pre-drill the hole as instructed and with extreme diligence tap the hole perfectly straight. Use cutting fluid. Memorize the exact angle the tap enters the hole as this is the exact angle the helicoil tool has to be at to work. Hold the tool flat and hard against the hole till you have screwed the coil in completely. I dabbed oil on the helicoil to help it install smoothly. Take measure of how far you need the helicoil to insert. You have one shot at this as if you go too far the threads of the sensor will not grab correctly and you cannot back the helicoil back out. Too short you start over. Once you back the tool off the coil you are done. You cannot get it back on that tool again. Just take a pair of needle nose pliers and rip the coil out and start over. The kit comes with 6 coils and it was the last coil that finally worked. I felt like I hit the lottery. The oxygen sensor screwed on perfectly.Disclaimer I was doing all this from under the truck as by the shop estimation book it takes 5.5 hours to remove the manifold from my truck 2003 Toyota Tundra V8. This saved me several hundred dollars. Hope this helps...