Lisle 20200 Thread Chaser

This thread chaser worked great! I used it on a small engine on a log splitter. Saved the day!

Bought it to use on aircraft engines where 14/18mm plugs are the norm. Earlier today I used it to clean/chase spark plug threads on a Franklin 6A4-150 aircraft engine--- worked exceptionally well.

I was replacing the o2 sensor on a bmw 3.0 and I could tell the threads were galling and if I were to finish removing the sensor, I may not be able to get the new one back in. I found this one on amazon and sure enough the 18 x 1.5 was the correct match. I strong armed the sensor out and the threads were in bad shape. All the threads from the sensor were gone and much of the material was in the the threads of the exhaust manifold. I used a deep impact socket and a breaker bar. The o-ring proved very worthy here as it slid up in the socket and held its place without falling out. Even being pushed all the way in the socket, it left plenty of the chaser tool exposed. I began turning and applying pressure to get it threading into the exhaust manifold. Since this isn't a tap for true thread cutting, it would get tight and hard to turn. The name of the game here is tighten it and back it off, back and forth, around an 1/8 to 1/4 turn at a time. This is why I used the breaker bar, a ratchet would continually have to have the direction switched to go back and forth which is a pain. As you keep threading it in further and doing the back and forth, you can feel it loosening as it clears threads. Every time you back it off, you try to slightly advance the turn, until you get all the way through. I sprayed a little WD40 occasionally to help with the friction as it will get warm to hot.In conclusion this thread chaser worked perfectly and ultimately saved the day! Lisle tools have always been a quality go to for me. The thought of replacing the exhaust manifold and the headaches that one can encounter doing that job, were happily avoided.I helped my son do this job. The value of patience and making sure you have the right tools to do the job, really shined through here!BTW: I used a standard o2 sensor socket to start with. After about 1 full turn it got real tight, where then the socket splayed and jumped, which suggested the threads were galling. Ultimately I had to clip the wires on the sensor and remove the upper parts of it to get a regular deep well socket on to get it out. An o2 sensor socket is longer than a standard deep well socket. Hopefully this may prove helpful to someone else with the same problem

My differential had a stripped fill plug and I need a large thread chaser to clean up some stripped threads, this worked very well and cleaned up the threads for my fill plug. Unit seems to be high quality and held up well during my usage.

Worked perfectly to straighten spark plug threads. A must have tool. Follow instructions. I used assembly grease in tool channels to catch any burrs or debris. Make sure piston is at stroke bottom before running tool fully into threads. Lisle tools are simply the best.

The spark plug hole on my snowblower was tapped at such an angle that the engine covers and heat shields on the machine block the correct angle for a reinstalling it with a plug wrench. The hole also lacked a chamfer. Learning this involved some damage to the lead threads. I first used a Powerbuilt thread repair tool to iron out the threads and finished with this thread chaser to complete the job. It would be tempting to just use the thread chaser, but I would not recommend it. I recommend both using these tools. The Powerbuilt tool is:https://www.amazon.com/dp/B0014FGVVW?ref=ppx_yo2ov_dt_b_product_details&th=1

Works like it should, at a reasonable price.

Worked like i would expect.

I was concerned that this would make the threads worse but it worked perfectly. Remember to vaccum or blow out the cylinder after to get out any metal filings

Worked perfectly for chasing cylinder head spark plug hole

Worked fine

It did its job to make a new thread.

Easy fix