cross threaded spark plug
Instructor
Joined: Jan 2014
Posts: 213
Likes: 4
From: San Francisco California
Very odd about that bent electrode, especially since you gapped it prior to install.
BTW, for what it's worth, although I've never done it...yet, I have heard of people putting grease or vaseline on a thread chaser to prevent fresh shavings from falling into the combustion chamber when chasing a spark plug thread.
BTW, for what it's worth, although I've never done it...yet, I have heard of people putting grease or vaseline on a thread chaser to prevent fresh shavings from falling into the combustion chamber when chasing a spark plug thread.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,465
Likes: 40
From: Auburn MA
Very odd about that bent electrode, especially since you gapped it prior to install.
BTW, for what it's worth, although I've never done it...yet, I have heard of people putting grease or vaseline on a thread chaser to prevent fresh shavings from falling into the combustion chamber when chasing a spark plug thread.
BTW, for what it's worth, although I've never done it...yet, I have heard of people putting grease or vaseline on a thread chaser to prevent fresh shavings from falling into the combustion chamber when chasing a spark plug thread.
Instructor
Joined: Sep 2007
Posts: 127
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From: Apollo Beach. Fla
Race Director
Joined: Apr 2003
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From: moraga ca
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,465
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From: Auburn MA
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
I looked using a mirror and everything looks clear the threads just look a little beat up
BTW, what year Vette, engine, heads, exhaust???
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,465
Likes: 40
From: Auburn MA
94 LT1 Base Coupe 6-spd stock engine, stock heads, with long tube headers, and remote mounted 76mm turbo.
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Burning Brakes
Joined: Jun 2008
Posts: 895
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From: toledo ohio
Very odd about that bent electrode, especially since you gapped it prior to install.
BTW, for what it's worth, although I've never done it...yet, I have heard of people putting grease or vaseline on a thread chaser to prevent fresh shavings from falling into the combustion chamber when chasing a spark plug thread.
BTW, for what it's worth, although I've never done it...yet, I have heard of people putting grease or vaseline on a thread chaser to prevent fresh shavings from falling into the combustion chamber when chasing a spark plug thread.
Instructor
Joined: Jan 2014
Posts: 213
Likes: 4
From: San Francisco California
Terrific!
That's good to know
That's good to know
i just used a spark plug thread chaser in a 94 lt1 (fleetwood) lisle part number LIS20020 and did the trick with putting grease in the gaps on the threads to catch shavings. it worked perfectly and now the plug screws in just fine. i cant recommend it enough. cost me ten bucks. try it!
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,465
Likes: 40
From: Auburn MA
i just used a spark plug thread chaser in a 94 lt1 (fleetwood) lisle part number LIS20020 and did the trick with putting grease in the gaps on the threads to catch shavings. it worked perfectly and now the plug screws in just fine. i cant recommend it enough. cost me ten bucks. try it!
Melting Slicks
Joined: Aug 2008
Posts: 2,082
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From: Palmdale CA
Instructor
Joined: Apr 2013
Posts: 144
Likes: 0
From: NW Arkansas - usually winter in FL
Just me bit I always use "no-seeze" on plugs that screw into aluminum heads. Have used both aluminum and copper stuff with equal results. Doesn't take much so a small tube will last a long time. Kind of messy though so take care. Use a small solder brush - the kind plumbers use.
Are you sure there is not a portion of another spark plug - the threaded part - still in that hole? The fact the ground electrode is getting bent flush against the center electrode has me wondering.
Jake -
Are you sure there is not a portion of another spark plug - the threaded part - still in that hole? The fact the ground electrode is getting bent flush against the center electrode has me wondering.
Jake -
Last edited by jake corvette; Sep 11, 2014 at 05:01 PM.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,465
Likes: 40
From: Auburn MA
Well my mechanic was able to tap it out.... threads look great and I have the new plug in... He confirmed that it looked like the plug wen in crooked enough where the ground strap pushed against the spark plug hole and bent it. Here is a picture of the plug hole prior to repair.
Team Owner
Joined: Sep 2003
Posts: 25,331
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It damaged the taper seat also it appears. Did you run the new plug in and remove it to confirm that it maybe "corrected" the taper on the seat? I certainly would. It looks like you've got what it takes to get a real good look or at least snapshots so I'd certainly take a look at the spark plug sealing surface. I'm amazed that you actually "wrenched" on it as hard as would have been required to accomplish what you did with out realizing there was a problem before that much damage was done. If it's fixed now you're fortunate. Patience!
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,465
Likes: 40
From: Auburn MA
It damaged the taper seat also it appears. Did you run the new plug in and remove it to confirm that it maybe "corrected" the taper on the seat? I certainly would. It looks like you've got what it takes to get a real good look or at least snapshots so I'd certainly take a look at the spark plug sealing surface. I'm amazed that you actually "wrenched" on it as hard as would have been required to accomplish what you did with out realizing there was a problem before that much damage was done. If it's fixed now you're fortunate. Patience!