Powerbuilt 14mm Back Tap Thread Repair Tool - 640811

It help my to rethread spark plug dameged thread on my Toyota prado

Brilliant design. Life saver when changing old spark plugs that have been in an alloy head for 25 years! (so the cylinder head threads are not in great condition). Perhaps the whole tool could be an inch longer, but I just used a long 1/2 inch socket as an extension. The knurled nut is a bit tricky to tighten up when you're up to your elbows in engine bay. Nevertheless I managed to chase out 4 spark plug holes on an ML430 where the engine bay is very tight on one side. A couple of the plugs were very hard to get out due to binding with the thread in the cylinder head, but after running this tool through them I was able to screw in the new plugs by hand (before torquing up to 25nm). I still have 12 more to do (there are 16 plugs on that engine!) and I'm considering cutting a slot in the end of the knurled nut so I can tighten it with a flat blade screwdriver. Make sure you apply a smear of sticky grease to the thread tap so that it collects any debris as you wind it out of the head.

I call this tool ''Tool doing miracles'' I purchased last february 15 2022 a used John Deere Lawn tractor with snowblower attachement. 6 weeks later I wanted to inspect the 2 spark plugs. The one at the right was OK just need a minor clean. Reinstall was easy. However the left spark plug was not that easy to reinstall because threads were stripped. After reserches I landed on this wonderful tool sold by Amazon. As soon as I have received it I rush to my tractor and did the job as recommended by the manufacturer. 3 passes were necessary and the thread came back as good as new. This tool at the end cost barely nothing because it will save you pain, tears and stress and lot of money. Install the tool in the spark plug hole up the end of threads, turn the adjusting screew to give some expension (3 passes) last pass at full expension. Turn slowly until it pops out and start next pass. The good thing compare to other tools (taps) is that you won't start repairing the threads from the outside and gradually going inside.....no, this tool starts from inside coming outside the hole gradually...... Wonderful. Who's the inventor???? He's awesome!!!!

Excelente producto la dejo como nueva!

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