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Unread 09-04-2013, 12:38 PM   #1
JeeperSC
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2008 JK Wrangler 
 
Join Date: Oct 2008
Location: South Carolina
Posts: 661
All of my spark plugs were in insanely tight. The jeep has 40,000 miles and I was replacing the original plugs. The plug on the passenger side all the way in the back seems impossible to get out. I think it's the #1 plug.

I had a swivel joint attached to the spark plug socket. Then about a 13 in
Extension attached to the torque wrench so it extended far enough out of the engine bay so I can get enough leverage to twist. The thing still won't budge. Infact, it broke the new duralast universal joint! The plastic around the spark plug also cracked all up. So now it HAS to come out before its drivable.. Any ideas. I know I could probably use a larger torque wrench.

image-947650739.jpg

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Unread 09-04-2013, 01:36 PM   #2
JeeperSC
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My failed system...

image-3417506047.jpg
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Unread 09-04-2013, 02:13 PM   #3
jnicewan
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That's a pretty steep angle for the swivel joint, the higher the angle the more you will have binding and the joint will flex/break. Im not familiar with the JK's enough to know if you can access the plugs through the inner fender or from underneath but you might try that. The less extensions, and straighter you can get your setup then the easier it will come out. Since the plug is broken you might be able to use a regular socket to get the broken plug out if it helps.
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Unread 09-04-2013, 02:45 PM   #4
JeeperCreepers7
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Have you tried jacking up the engine on that side and going in from underneath?
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Unread 09-04-2013, 02:52 PM   #5
wtfcrunch
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Yeah its the angle you are coming from although it seems the only way you need to get a better angle on the plug. All that torque you are applying isn't hitting the spot
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Unread 09-05-2013, 10:02 AM   #6
Pierre_r
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It looks like you have to remove the battery to get a better angle.
The problem you have is that the extension you have on steals all the torque you are using on the handle.
The extension,s always twist alittle like the torsionbars in a suspension.
Most of the force you use to turn is being used to twist the extension instead and you only got something like 30-40% of the force down where you need it to be (just made up that number)
Use a shorter extension or put a piece of pipe on the handle to give you more torque

How does the extension look like that you are using?
Does it look like this:

Or this:

Notice how they are different at the end where you use the ratchet and socket.

The first one is useless the more force you use on it the more it will twist like a torsionbar and then finally snap.
I dont know how many of those o have destroyed untill i found the other one.

The second wont twist so easy, i have never destroyed one that looks like that.
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Unread 09-05-2013, 05:21 PM   #7
JeeperSC
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Quote:
Originally Posted by Pierre_r
It looks like you have to remove the battery to get a better angle.
The problem you have is that the extension you have on steals all the torque you are using on the handle.
The extension,s always twist alittle like the torsionbars in a suspension.
Most of the force you use to turn is being used to twist the extension instead and you only got something like 30-40% of the force down where you need it to be (just made up that number)
Use a shorter extension or put a piece of pipe on the handle to give you more torque

How does the extension look like that you are using?
Does it look like this:

Or this:

Notice how they are different at the end where you use the ratchet and socket.

The first one is useless the more force you use on it the more it will twist like a torsionbar and then finally snap.
I dont know how many of those o have destroyed untill i found the other one.

The second wont twist so easy, i have never destroyed one that looks like that.
It was like the first one. I was using 3 crappy extensions and an elbow. Cheap tools and inexperience.

I ended up getting the spark plug out without removing anything else. By replacing the plugs it fixed an idle issue I was having an it runs smoother.

Thanks for all the help!
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Unread 09-05-2013, 07:40 PM   #8
JeeperSC
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image-3254495152.jpg

Here are 5 of them. One or all was causing a bump while at idle.
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Unread 09-10-2013, 06:01 AM   #9
vadslram
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Those plugs look good.
Good and worn but no indication of a problem.

Pierre, If you can torque a steel shaft that has a shear point of 11,000 lbs with your bare hands and a breaker bar, you need to register with Guiness world records.
You figure the tortional strength using:
θ = L · T / (Ip · G) (5)
where
θ = angular shaft deflection (radians)
L = length of shaft (mm, in)
G = modulus of rigidity (Mpa, psi)

Low carbon junk steel is like 860 inlbs to yield, depending on composition it is 3 times that to deformation. with a 10" breaker bar you would need to put almost 250 lbs to twist it. If the plug still sticks at that much torque the threads are going to be crap when you get it out anyway.
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