SPARK PLUG NOT THREADING ALL THE WAY

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Aug 17, 2023 | 08:28 AM

Fishwithdave

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SPARK PLUG NOT THREADING ALL THE WAY

I need some advice! Changed my sparkplug on 2011 F250.. I started at #8 and worked backwards. No issues removing or installing until #1 plug. It will not thread all the way! Is there an easy fix? Never had issues before! Thought of force threading, retapping the hole.

Aug 17, 2023 | 08:57 AM

Akley88

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top or bottom set of plugs? were you able to remove the plug?

Aug 17, 2023 | 09:29 AM

Mike1

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If the old plug came out no problem without damaged threads then one would assume the new plug thread is damaged, Did you try a different plug or put one of the pld ones back in to see if it threads down all the way?

Aug 17, 2023 | 09:55 AM

Fishwithdave

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Bottom plugs. I did try other plugs and even tried to put the old one back. I did not see any damaged threads. I've tried tightening & loosening a but at a time but my gutt says to stop.

Aug 17, 2023 | 10:00 AM

Mike1

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Quote:

Originally Posted by Fishwithdave

Bottom plugs. I did try other plugs and even tried to put the old one back. I did not see any damaged threads. I've tried tightening & loosening a but at a time but my gutt says to stop.

I would grab a bore scope if you have one available to look at the thread hole. Then use a chaser tap with grease on it to catch any filings that may come off.

Aug 17, 2023 | 10:06 AM

Fishwithdave

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Quote:

Originally Posted by Mike1

I would grab a bore scope if you have one available to look at the thread hole. Then use a chaser tap with grease on it to catch any filings that may come off.

Do you know the tap size? Just asking to make my life easier but I can find out if you don't know.

Aug 17, 2023 | 10:09 AM

Mike1

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I do not, I thought I might have the same problem when I changed my plugs on my 03 5.4L but my only problem was dirt and crud in the plug wells. once I made a tool to cut all that stuff out, my plugs came out easy and went in easy.