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Discussion Starter #1
Well while mowing the lawn today the tractor died. Open the hood to take a look and the spark plug blew out of the head. Can i helicoil it? Do I have to take the head off to do it? What size am I looking for
 

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Old as Sin
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contact one of your local auto parts store to see if they sell helicoil , then just take your old plug in to get it matched up
 

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Loving Life :-)
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Yep, you sure can. And yep, best to take the head off.

I got this one kit with the Tap and various length coils from Autozone. Peened it in too, from the underside.
 

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Loving Life :-)
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4,007 Posts
Peened pic, just seemed a little loose, as someone else was in this engine before me. This coil was a little long, so it was ground back to the head face.
 

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there are good usable heads on EBay for $30.00. You should remove the head to do a coil so why not just get another head and do it right.
 

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Loving Life :-)
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Just to be clear, the one I use is not exactly a helicoil, which is kinda like asking for " Kleenex" which is a brand of tissue, not the product.

" Helicoil" is kinda like the same thing, there are several types.Most are a coil of wire that just goes down into the threads.

The one I used is more like a time-sert, which is a full threaded sleeve, complete with a flanged top to receive the spark plug compression washer . While not exactly ideal , they sure do work well, especially if you want an engine running, and cannot source a replacement head.

http://www.timesert.com/html/bigsert_sparkplug.html


M14x1.25
Standard p/n 5141
-------------------------
M14x1.25
Extended Version
p/n 5141E
5141
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5141E
.370​
9.4mm​
51401​
n/a​
.430​
11mm​
51403​
51453​
.600​
15mm​
51405​
51455​
.660​
16.8mm​
51407​
51457​
.905​
23mm​
51409​
-------​
 
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