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Spark Plug Thread Repair?


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36 replies to this topic

#16 glgrumpy ONLINE  

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Posted December 12, 2012 - 09:27 PM

Yeah, I did one of those all in one kits on a car head once. Forgot about it! It held too!

Was just coming back to say epay seller jrhaines (Good guy and cheaper than most) has a head for $20 from PK. Has one tin holding bolt broke off in it. He shows that, along with other pix of head.

#17 robert_p43 OFFLINE  

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Posted December 12, 2012 - 09:35 PM

I had an old moped once that ran great but would sudenly not run. Even though the plug looked good and showed good spark, I would have to put in a brand new one for the machine to run again. I carried a plug socket and new plug wherever I went. One day it happened and I could no longer tighten the spark plug. I went to NAPA and bought a kit. I remember it was easy and had me back on the road in no time. The problem I had with it was this. The "have to put in a new plug often" problem was still there, and sometimes the helicore wanted to unscrew with the plug.

#18 whst400 OFFLINE  

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Posted December 12, 2012 - 11:04 PM

First off, I've been advised that a threaded insert is much better than a helicoil. Second, I went to my lawn dealer and he repaired it for $10. Cheaper than the kit.

Excellent point! The Heli-Coil was designed to repair threads in holes where a threaded insert is not practical: ie an automotive engine head that costs considerable dollars and time to remove and replace. Most small engine heads can be removed in a very few minutes and a threaded insert and head gasket usually cost less than a heli-Coil kit. A properly installed threaded insert will almost never unscrew when removin a spark plug, unlike Heli-Coils.

#19 LilysDad ONLINE  

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Posted December 13, 2012 - 08:32 AM

There is a Loctite Red that will freeze those threads forever now.

#20 Alc OFFLINE  

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Posted December 13, 2012 - 08:36 AM

I had my K301 head reapired at a machine shop I wonder how it was done now ? Always thought it was Heli-Coiled but after reading this thread not so sure , doesn't matter which ever way it's been fine for about 15 years , Al

#21 Guest_gravely-power_*

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Posted December 13, 2012 - 10:23 AM

There is a Loctite Red that will freeze those threads forever now.


It also works very well on loose bearing races.

#22 marlboro180 OFFLINE  

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Posted December 13, 2012 - 10:29 AM

Here at the shack there is generally a spark plug thread repair once in a while. I use the Time- Sert tool I bought a couple years ago,and it has never let me down.

In general, the kit I got from the car parts store, has a few threaded sleeves ( threaded inside and out) , a ream, a tap, and an installation tool. It works great, and was fairly priced considering the money and aggrevation it has saved me ( and a couple buddies too) .

added a link : http://www.timesert.com/

This pictures repair below was a Sunday afternoon affair, and the insert wanted to walk back out of the head despite using red locktite. I then peened around the insert, and that was that.

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Edited by marlboro180, December 13, 2012 - 10:38 AM.

  • MH81 said thank you

#23 Ryan313 OFFLINE  

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Posted December 13, 2012 - 03:01 PM

I went to autozone last night, they had them but they where all metric... except one. It said it was 1/2 but it looked pretty small. Is the 1/2 the ID or the OD?

#24 DougT OFFLINE  

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Posted December 13, 2012 - 03:52 PM

The spark plug should be 14mm thread.

#25 Ryan313 ONLINE  

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Posted December 13, 2012 - 05:36 PM

The spark plug should be 14mm thread.


Oh... maybe that is why my 1/2 tap didn't fix it! My tap and ide set only goes up to 13mm. I just figured it would be standard.

Edited by Ryan313, December 13, 2012 - 05:37 PM.


#26 LilysDad OFFLINE  

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Posted December 13, 2012 - 06:18 PM

This pictures repair below was a Sunday afternoon affair, and the insert wanted to walk back out of the head despite using red locktite. I then peened around the insert, and that was that.


You need to be careful of the holes left by peening. Staph bacteria can set up shop in there and eventually they will eat away at the head, weakening it.

#27 marlboro180 ONLINE  

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Posted December 13, 2012 - 06:55 PM

Oh... maybe that is why my 1/2 tap didn't fix it! My tap and ide set only goes up to 13mm. I just figured it would be standard.


Ya, that would make things go poorly LOL. 14mm x 1.25 pitch, generally makes things in the spark plug world happy.

LD- that repair pictured above was on the ugly mower triplex beastie.... Do you think the resultant staph infection is why it looks sickly ? :-) The clumsy handed surgeon did grind away the longish insert though, assuring no interference inside the heart of the beast. ;-)

#28 xshooter OFFLINE  

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Posted December 13, 2012 - 08:05 PM

There is a Loctite Red that will freeze those threads forever now.

It also works great on slightly loose splined shafts.

#29 LilysDad OFFLINE  

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Posted December 13, 2012 - 08:50 PM

I would sure take a biopsy of that head and send it to the lab. And check your health insurance.
  • marlboro180 said thank you

#30 LilysDad ONLINE  

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Posted December 14, 2012 - 11:09 AM

I have an old Wisconsin 4 hp engine that has 18mm threads. Not easy finding a kit for that! (That's the one the dealer finally fixed for me.)




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