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Stuck spark plug


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  #1  
Old 09-12-2011, 03:01 AM
oldschoolwisconsin oldschoolwisconsin is offline
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Default Stuck spark plug

I need some advise on removing a stuck spark plug from an aluminum cylinder head without pulling the threads out of the head with the plug. Anyone have any ideas?
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Old 09-12-2011, 03:37 AM
ehpower2 ehpower2 is offline
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Default Re: Stuck spark plug

i would heat the head with a mapp gas torch and then give it a good blast of pb see if it will pull into the threads.
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  #3  
Old 09-12-2011, 03:44 AM
Roland Hayes Roland Hayes is offline
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Default Re: Stuck spark plug

Heat, aluminium expands at an extrodinary rate, if you can run the engine until very hot, give it a try then. Or, if you can remove the head then it would be easier, the threads would be accessible from the underside and could be soaked with penetrating oil for a few hours and then you could put the head on the stove until very hot indeed without any problems with the aluminium, which can take up to 400 deg. C ok.
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Old 09-12-2011, 07:30 AM
grub54891 grub54891 is offline
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Default Re: Stuck spark plug

Had that happen a few time's when I worked at an auto shop.I'd get the boss,and he would get out the rattle gun,set it to low,and "tap" the trigger a few times,out it would come.I don't like doing that as I was afraid of breaking the plug or stripping the head.But it worked for him.I alway's got the boss so I wouldn't be the guilty guy breaking the thing but we never broke em.
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  #5  
Old 09-12-2011, 08:13 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Stuck spark plug

If the plug is siezed in there it will probably take the threads out with it. Safest thing to do would be to drill through it, cut or grind untill the threads are just touching, peel it out. I have a Dremel with a 1/8" carbide burr, works great for removing broken bolts. I drill the broken bolt, grind two spots on opposite sides, peel the remains out with a small cape chisel.
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Old 09-12-2011, 09:23 AM
K D Redd K D Redd is offline
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Default Re: Stuck spark plug

If this is on a Wisconsin head, I have seen these welded so completely that you could hardly tell where the plug stopped and the head began. Your only option may to take the old plug out along with the threads in the head. Then install a thread repair sleeve.

Kent
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  #7  
Old 09-12-2011, 11:14 AM
brew56 brew56 is offline
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Default Re: Stuck spark plug

If the plug is stuck, there is a good chance that the threads are already damaged, possibly from cross-threading. The only way I know to remove the plug is either a lot of patience, or muscle it out and take a chance with the threads.

The head may be a heli-coil candidate, though.
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  #8  
Old 09-12-2011, 12:40 PM
Harold Mayer Harold Mayer is offline
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Default Re: Stuck spark plug

I use dry ice on the plug it works every time
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Old 09-13-2011, 03:25 AM
oldschoolwisconsin oldschoolwisconsin is offline
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Default Re: Stuck spark plug

Quote:
Originally Posted by K D Redd View Post
If this is on a Wisconsin head, I have seen these welded so completely that you could hardly tell where the plug stopped and the head began. Your only option may to take the old plug out along with the threads in the head. Then install a thread repair sleeve.

Kent
it is a Wisconsin head. But its not welded THAT bad. Last night I sprayed it with some GM penetrant, and it seemed to absorb it. I remember BEFORE i disassembled this engine I could turn it with a wrench, but it was SUPER difficult to rotate. So i dunno.

---------- Post added at 03:25 AM ---------- Previous post was at 03:22 AM ----------

Also, does ANYONE know where I can get another plug for this Wisconsin? Can i possibly use an aviation type spark plug? Is it the same thread diameter, coz the nut part is the same diameter as an aviation plug.
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Old 09-13-2011, 11:48 AM
Zira Zira is offline
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Default Re: Stuck spark plug

Any auto parts store should have the Champion D-16 or UD-16 plug.
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Old 09-13-2011, 12:47 PM
kd5byb kd5byb is offline
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Default Re: Stuck spark plug

Our AutoLite 386 or if you want a little hotter plug, the 388.

Like $1.50 each at Advance Auto here...

thanks,
ben
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  #12  
Old 09-13-2011, 01:17 PM
Zira Zira is offline
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Default Re: Stuck spark plug

I've never tried the Autolite's in a Wisconsin but have had good luck with them in other engines & the price is certainly right. For older Wisconsin's I try to use a COM 8, otherwise the D-16. I have also used a Stitt (?) plug just because I had it & it seemed to work fine.
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  #13  
Old 09-13-2011, 07:13 PM
kd5byb kd5byb is offline
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Default Re: Stuck spark plug

I've been happy with them - they seem to work well and I like the black color versus the shiny Champion silver.

One of the folks here pointed out that AutoLite is making a LOT of classic old engine plugs once again. So I'm trying to thank them by using them when I can.

thanks much,
ben
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Old 09-14-2011, 02:32 AM
oldschoolwisconsin oldschoolwisconsin is offline
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Default Re: Stuck spark plug

Thanks for the info on spark plugs guys.

---------- Post added at 02:23 AM ---------- Previous post was at 02:21 AM ----------

Oh also, do new plugs also have the 4 negative electrodes like the one thats in the engine does? The only reason I need to replace this plug is because the porcelin is broken a little bit. Other than that its still good.

---------- Post added at 02:32 AM ---------- Previous post was at 02:23 AM ----------

I just looked at the plug thats STILL stuck in the head, its a Champion C26
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  #15  
Old 09-14-2011, 12:47 PM
kd5byb kd5byb is offline
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Default Re: Stuck spark plug

I know for a fact that the AutoLites are standard, "one-prong" plugs.
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  #16  
Old 09-14-2011, 10:31 PM
Bill Sherlock Bill Sherlock is offline
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Default Re: Stuck spark plug

Personally, I would use an impact wrench with a deep socket, starting off with reduced power. It's my understanding that spark plugs should not be removed from an aluminum head while hot. At least those were instructions for our '95 Ford Contour with the aluminum 4 banger engine.

Bill
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Old 09-15-2011, 01:54 AM
oldschoolwisconsin oldschoolwisconsin is offline
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Default Re: Stuck spark plug

ya Ive been told to NOT remove a plug from a hot cylinder head, ESPECIALLY on my BMW. Coz it can pull the threads right out.
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  #18  
Old 09-15-2011, 11:47 PM
oldschoolwisconsin oldschoolwisconsin is offline
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Default Re: Stuck spark plug

So I took the head to work with me and used my impact wrench to remove it. It came right out, pulled the top 1/4ths of the threads out. But one of the guys at work had a spark plug hole tap, and I used it to clean up the threads, when I got home, i test fitted the hole with an aviation plug(same diameter, which I am kinda fond of) and the threads are perfect! YAY! if I were to run the aviation plug, Id need a different kind of plug wire, coz it goes inside the plug instead of clipping to the top.
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Old 09-16-2011, 06:23 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Stuck spark plug

This is why I suggested drilling and cutting the plug out. If the plug has a piece of aluminum stuck in the threads the best pentrant won't help. When you unscrew the plug the piece stuck in the threads will take the threads out above it. You'e lucky it wasn't the bottom thread. If you had cut the plug and peeled it out there would have been minimal damage and you could have tapped it.
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  #20  
Old 09-16-2011, 09:22 AM
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Elden DuRand Elden DuRand is offline
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Default Re: Stuck spark plug

Oldschool:

Remember to use anti-seize compound (for aluminum!) when you put the plug back in.

Take care - Elden
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