Replace plug with repaired threads?

[Bolt snapper]

So my buddy's truck blew a plug several years back and a local shop did the insert repair. He's long overdue for a tune up and is having some issues that I think are related to bad coils, coil boots, plugs.

Should we skip changing the plug on the repaired cylinder? Will trying to remove the plug remove the insert and cause a bigger problem?

 

[The6ofus]

I had a 99 F-150 5.4 do the same thing around 75000 miles. I repaired it myself with the Time Sert kit. When I changed plugs around 150k I had zero issues with that cylinder/spark plug, removing or reinstalling.

 

[Hamfisted]

If it was properly repaired with a Timesert you should have no issues with plug changes.

 

[Trainmaster]

I replaced mine that were repaired with a Timesert also with no problems. You really don't have to much of a choice... that plug has to be changed - eventually. Even if it wasn't done properly and some poorly installed Heli-coil comes out on the plug, it shouldn't damage anything.

 

[1955moose]

They pretty much said it all. You don't want to run around with 7 new plugs, and one old worn out one.

Sent from my N9131 using Tapatalk

 

[Esat]

So my buddy's truck blew a plug several years back and a local shop did the insert repair. He's long overdue for a tune up and is having some issues that I think are related to bad coils, coil boots, plugs.

Should we skip changing the plug on the repaired cylinder? Will trying to remove the plug remove the insert and cause a bigger problem?

Use some of that penetrating oil, it helps to soften the dirt, oxidation ect.

Sent from my SM-N960U1 using Tapatalk

 

[Bolt snapper]

Just to update and close the loop (I hate posts that never come back and give the final disposition!): We changed out the plug in the repaired cylinder. It came out with no problem. Going back in, after hand tightening, I switched to the torque wrench as I had with the previous 6 or 7 plugs. After a few ratchets I began to realize that it wasn't going to come up to torque (I'm wondering if the insert was starting to turn in with the plug?). I just called it good and went on. Knock wood, it started up and has run fine now for several hundred miles.