crossthreaded plug hole!!!
Thread Starter
Drifting
Joined: Mar 2011
Posts: 1,886
Likes: 9
crossthreaded plug hole!!!
Help me, guys.
I crossthreaded the #7 plug hole.
I remember reading there is a tool that somehow collapses and can be inserted deeply into the hole, and then expanded and unscrewed, rethreading the hole from the bottom, out.
Anybody else heard of such a thing? Where can I get one?
Thanks in advance.............
I crossthreaded the #7 plug hole.
I remember reading there is a tool that somehow collapses and can be inserted deeply into the hole, and then expanded and unscrewed, rethreading the hole from the bottom, out.
Anybody else heard of such a thing? Where can I get one?
Thanks in advance.............
2026 Loser of the Year
Joined: Sep 2013
Posts: 36,579
Likes: 7,020
From: New Or-leens Loo-z-anna
Help me, guys.
I crossthreaded the #7 plug hole.
I remember reading there is a tool that somehow collapses and can be inserted deeply into the hole, and then expanded and unscrewed, rethreading the hole from the bottom, out.
Anybody else heard of such a thing? Where can I get one?
Thanks in advance.............
I crossthreaded the #7 plug hole.
I remember reading there is a tool that somehow collapses and can be inserted deeply into the hole, and then expanded and unscrewed, rethreading the hole from the bottom, out.
Anybody else heard of such a thing? Where can I get one?
Thanks in advance.............
I don't know about that. You can buy a thread Tap and "chase" the threads carefully, but you will have to deal with metal particles unless you remove the head to repair the threads
Le Mans Master
Joined: Oct 2010
Posts: 6,930
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From: melbourne florida
2023 C3 of the Year Finalist - Modified
i vaugely remember something like that, it was used on 4.6 ford modular motors as they are terrible for stripping out plug holes.
a helicoil or something like mentioned above is your best option.
no , you aren't nuts
a helicoil or something like mentioned above is your best option.
no , you aren't nuts
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Melting Slicks
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From: KB7TIF Ville NV
Safety Car
Joined: Sep 2013
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From: Draper Utah
I used a back tap just last week to correct a cross threaded plug. It worked like a charm and everything was good to go in less than 15 minutes. The tool was $23 on Amazon. Search Powerbuilt back-tap.
Race Director
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From: Grapevine Tx
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2016 C3 of the Year Finalist
Safety Car
Joined: Sep 2013
Posts: 4,355
Likes: 2,633
From: Draper Utah
FWIW: here is the email I sent a friend last week.....
Holy crap.... changed spark plugs in the Corvette yesterday and I couldn't get one of the plugs to thread in. I spent about 15 minutes trying to get it started and nothing, It wasn't cross threading, it just would not start. Best of all the plug is one located under the AC compressor so I can't see what I'm doing as I'm working by braille. I didn't want to run a tap out of fear of metal filings getting into the engine. Spent the night not sleeping and having nightmares about having to pull the heads.
Anyhoo..... I found this awesome little tool to repair spark plug threads by back tapping. It worked like a charm and took 10 minutes. The tool works by extending through the spark plug hole and tapping from the inside out.
Powerbuilt Back-Tap Thread Repair Tool
Holy crap.... changed spark plugs in the Corvette yesterday and I couldn't get one of the plugs to thread in. I spent about 15 minutes trying to get it started and nothing, It wasn't cross threading, it just would not start. Best of all the plug is one located under the AC compressor so I can't see what I'm doing as I'm working by braille. I didn't want to run a tap out of fear of metal filings getting into the engine. Spent the night not sleeping and having nightmares about having to pull the heads.
Anyhoo..... I found this awesome little tool to repair spark plug threads by back tapping. It worked like a charm and took 10 minutes. The tool works by extending through the spark plug hole and tapping from the inside out.
Powerbuilt Back-Tap Thread Repair Tool
Last edited by Iceaxe; May 29, 2014 at 02:28 PM.