 Spark Plug installation, Used a thread chaser. |
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| malcolm2 |
 Nov 9 2026, 03:45 PM
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#1
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Advanced Member  Group: Members Posts: 2,763 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States 
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Blast away if you wish. Here is the deal.
I have a CHT on 3 so i installed it 1st. Removed the washer and started screwing in by hand. Did not get far. So i got my thread chaser and slowly moved it in and out. Pulled some metal out each time. Added some anti seize to the threads and the plug threaded in mostly by hand. #4 struggled much less. fewer metal bits. #1 went in by hand all the way and #2 was a bitch with some bits. But after the chasing it went in nicely. So what is the verdict on lite metal shavings and bits? I don't think i really had a choice. Without chasing the threads the spark plugs could have done some real damage. picture is from the 3 cylinders that required the ratchet on the chaser. Attached thumbnail(s) 
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| emerygt350 |
Nov 9 2026, 07:20 PM
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#2
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Advanced Member Group: Members Posts: 3,818 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Bad cross thread? Are you familiar with the heads or could a previous owner been up to something?
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