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Powerbuilt Spark Plug Back-Tap

  • Thread starter Thread starter Guest
  • Start date Start date
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Guest

Guest
This is a nifty tool called a 'back tap' that you can use to re-thread damaged spark plug holes-- and not worry about metal chips getting into the engine. Basically, you stick the tool into the spark plug hole, and as you tighten a knurled nut, the tap expands to fill the plug threads. You then 'unscrew' the tap back out of the hole. A little grease on the tap catches any chips. You tighten the nut a little more each time for several passes, gradually expanding the tap to the full size of the hole. I bought mine off of Amazon; it is made is the USA, and is a good quality tool http://www.amazon.com/gp/product/B0014FGVVW?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00.







My #4 plug was not sealing and causing low compression, so I gave this a try before resorting to a helicoil insert or replacing the head. It worked like a charm. It is more expensive than a regular 14mm x 1.25 tap, but you don't have to worry about vacuuming chips out of the engine, etc. To me it was worth extra cost.
 
I've seen these before. Thanks for mentioning them!

Honestly, the price is very reasonable and a lot lower than I recall from the last time these entered my forebrain -- only $23.74 on Amazon.
 
At that price it's worth gettting one for the day you'd eventually need it. Anyway, tool purchases need no justification :)
 
There are at least a few reviews indicating the tool broke while using, creating a bigger problem. It sounds like a good idea, but I'll stick with my plug chaser tool for now if and when needed. I use grease and a shop vac with a smaller hose to retrieve any swarf.
 
I think as long as you have some 'mechanics feel' and don't rush it, the tool will work fine. Yes, thread chasers would certainly stand more abuse. There is always a trade-off I suppose!
 
I agree, if you have to "feel" as you put it and work it gently and let the tool slowly work the threads and gunk it would work just fine. How many knuckleheads out there are just cranking it out thinking it's some heavy cutter? Who knows. That or it really is a chunk of junk....looks like it would work fine.
I've been blessed with good plug holes so far.
 
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