Need to rethread a plug hole from a blown plug - Yamaha Grizzly ATV Forum
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post #1 of 8 Old 02-12-2019, 01:58 AM Thread Starter
 
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Need to rethread a plug hole from a blown plug

Bought an '11 Vic with the 4.6L back in June and a few months back I tried to change out the plugs. All came out ok except for cyl 4 which only cranked out 1/4 turn. Had a shop take it out and they said they had to redo the threads. I've seen videos where you can remove a stuck plug by drilling into it somehow, but because this was in the 4 position and hard to get to I'm guessing they just power cranked it out. Not sure but I'm guessing those threads are compromised now.


Well, this past weekend that same plug blew out of cyl 4. Inspection reveals a coil and boot jammed up underneath the fuel rail and a plug that I fished out without any turning. When I go to install a new plug it just sits on top of the threads and turns without going in. So I guess what's happened is that the plug rotated most of the way out but when it got to the last couple threads the compression blew it out the rest of the way, and that it's just the top few threads in the hole that are damaged. Inspection of the plug reveals that most of the threads are intact except for the 2-3 that are closest to the element.


So my question is...should I try to fix this myself or just take it to a shop? Some kind of tap tool would probably fix it, but since it's the beginning threads that are boogered it'd probably have to start from the inside of the cylinder. I really don't have a clue as to how to approach this.
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post #2 of 8 Old 02-12-2019, 07:03 AM
 
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Definitely worth a try! Find a tap and give her a go. Put grease on hit to "catch" the metal chips.

Worse case the head will need to be removed and maybe a helicoil installed.

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post #3 of 8 Old 02-12-2019, 02:10 PM
 
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I would take it to a shop. Blowing plugs is a well know issue Fords have. Some thread inserts are stronger than others.
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post #4 of 8 Old 02-12-2019, 07:01 PM
 
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This is a common problem with certain Ford V8s. Go to your local parts house and get a repair kit. Comes with everything you need to repair the hole except the spark plug.

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post #5 of 8 Old 02-13-2019, 03:59 AM Thread Starter
 
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Thanks for all the advice. If this was where I could get to it I might try to do this myself, but since it's so far back it'll be a lot less headache to take it to the shop. Local guys charging $99 an hour. Is that what shop rates are these days?

What's the best kind of thread inserts? Are there different kinds in the heli coil style? I've heard of a newer one called Time-Sert but don't know if they have a higher success rate. Someone familiar with doing heli coils says lots of times the next time the plugs are removed the coil comes right out with it.
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post #6 of 8 Old 02-13-2019, 04:46 AM
 
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Helicoils definitely have their place. I'm not sure a sparkplug hole is one of those. This is a much better solution. https://www.amazon.com/CalVan-Tools-.../dp/B000Z9D6KW
I strongly suggest removing the head so you can be positive that the drill is correctly lined up. It would be real easy to oval out that hole or not line the tap up right while contorted into the engine bay. If you aren't tooled up with torque wrenches and basic hand tools, a reputable shop would end up saving you money over time. Especially if you end up doing it yourself twice. Upside is getting familiar with the inner working of your ride.....

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post #7 of 8 Old 04-11-2019, 07:27 PM
 
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I have had good luck with this, if the threads can still be used, or there is a problem with the plug wanting to cross thread. You slide it into the plug hole, expand it into the good threads and then screw it out.
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post #8 of 8 Old 04-14-2019, 07:48 PM
 
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Take the head off, Have a welder TIG weld and re-drill and tap the hole. Will be good as new.
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