Crossthreaded #2 plug :(
Crossthreaded #2 plug :( Hey guys, i need some help, i cross threaded my cyclinder 2 plug. 
Now do i need to remove my heads to tap them?? or can i do it on the car?? I know i will have to remove my Longtubes, as the cyclinder 2 primary is in the way, but what about the shavings?? can i like suck them out some way or is it a must to remove the head?? Also, what is involved in removing the head??? I have a LT1, so would i need to remove the intake? Or just the valve cover etc. Thanks for the help
Dave
Now do i need to remove my heads to tap them?? or can i do it on the car?? I know i will have to remove my Longtubes, as the cyclinder 2 primary is in the way, but what about the shavings?? can i like suck them out some way or is it a must to remove the head?? Also, what is involved in removing the head??? I have a LT1, so would i need to remove the intake? Or just the valve cover etc. Thanks for the helpDave
I'd just pull the head and do it on a bench top, less worry of dropping fillings and shavings into the cylinder and risk damaging the cylinder walls.
Cylinder head removal is fully detailed on http://ls1howto.com
Cylinder head removal is fully detailed on http://ls1howto.com
How bad is it? Just a couple threads? If you're really stuck, I'd put some heavy grease (axle grease?) on the tap, and run it through slowly (put it in 1/4", remove it, clean it off, put it back in, etc, make sure she's comfortable errr nevermind). The heavy grease will hold the shavings so you SHOULD be okay.
I still recommend pulling the head, btw.
Dope
I still recommend pulling the head, btw.
Dope
Spark plug tap The spark plug thread is 14 mm X 1.25. If the thread is not too damaged (just the top thread or two) you can repair it with the tap. Otherwise you will have to install a thread insert.
Best way is to remove the head from the car. Thread the tap using oil or (WD40) with your fingers into the plug hole from the combustion chamber side out. That way it will start straight in the existing threads. Turn it with a wrench or tap handle when you get to the damaged area. It will be nearly impossible to pick up the threads (not to mention start the tap straight) from the spark plug side of the head whether the head is on or off the car.
Steve Demirjian
Race Engine Development
Best way is to remove the head from the car. Thread the tap using oil or (WD40) with your fingers into the plug hole from the combustion chamber side out. That way it will start straight in the existing threads. Turn it with a wrench or tap handle when you get to the damaged area. It will be nearly impossible to pick up the threads (not to mention start the tap straight) from the spark plug side of the head whether the head is on or off the car.
Steve Demirjian
Race Engine Development
Originally Posted by Steve - Race Eng
The spark plug thread is 14 mm X 1.25. If the thread is not too damaged (just the top thread or two) you can repair it with the tap. Otherwise you will have to install a thread insert.
Best way is to remove the head from the car. Thread the tap using oil or (WD40) with your fingers into the plug hole from the combustion chamber side out. That way it will start straight in the existing threads. Turn it with a wrench or tap handle when you get to the damaged area. It will be nearly impossible to pick up the threads (not to mention start the tap straight) from the spark plug side of the head whether the head is on or off the car.
Steve Demirjian
Race Engine Development
Best way is to remove the head from the car. Thread the tap using oil or (WD40) with your fingers into the plug hole from the combustion chamber side out. That way it will start straight in the existing threads. Turn it with a wrench or tap handle when you get to the damaged area. It will be nearly impossible to pick up the threads (not to mention start the tap straight) from the spark plug side of the head whether the head is on or off the car.
Steve Demirjian
Race Engine Development
Dave
Trending Topics
this happened to me one time.
i got a spark plug hole chaser from autozone, put a ton of grease on it to both lube it and catch the threads, ran is through the crossthreaded plug hole. than fired the motor for a few seconds without that plug there to blow out all the crap
worked great
i got a spark plug hole chaser from autozone, put a ton of grease on it to both lube it and catch the threads, ran is through the crossthreaded plug hole. than fired the motor for a few seconds without that plug there to blow out all the crap
worked great
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
TECH Addict
Joined: Feb 2004
Posts: 2,826
Likes: 0
Originally Posted by Tally TransAm
this happened to me one time.
i got a spark plug hole chaser from autozone, put a ton of grease on it to both lube it and catch the threads, ran is through the crossthreaded plug hole. than fired the motor for a few seconds without that plug there to blow out all the crap
worked great
i got a spark plug hole chaser from autozone, put a ton of grease on it to both lube it and catch the threads, ran is through the crossthreaded plug hole. than fired the motor for a few seconds without that plug there to blow out all the crap
worked great