stripped spark plug hole
Thread Starter
|
Stage III
Joined: Apr 2008
Posts: 3
Likes: 0
stripped spark plug hole
got a 06 ultra classic with a stripped plug hole.i got a 12mm helicoil but the plug
dosen't fit,helicoil is too big.does anyone here know if a 10mm is what i need?
i've searched HDF,the internet,with no luck.
thanks for any help.
dosen't fit,helicoil is too big.does anyone here know if a 10mm is what i need?
i've searched HDF,the internet,with no luck.
thanks for any help.
Thread Starter
|
Stage III
Joined: Apr 2008
Posts: 3
Likes: 0
of the new plug to the helicoil.it slides in and out instead of screwing in and the helicoil
seems to about 1/8" larger inside diameter than the plug's outside diameter.
once the helicoil is installed,will it compress that much?
thanks again for your help.
hogrider98,if it was mine i would do just that!
Elite HDF Member
Joined: Sep 2006
Posts: 3,592
Likes: 6
From: Florida
I got this off of heli-coils site. They can explain it way better than me.
In the free state they are greater in diameter than the tapped hole into which they are installed. In the assembly operation the torque applied to the tang reduces the diameter of the leading coil and permits it to enter the tapped thread. When the torque or rotation is stopped, the coils expand with a spring-like action anchoring the insert permanently in place against the tapped hole. No staking, locking, swaging, keying, nor interference fit is required to retain HELI-COIL Inserts, thereby eliminating stress concentration in the parent material. The HELI COIL Insert automatically adjusts itself, radially and axially, to any expansion or contraction of the parent material.
http://www.emhart.com/products/helicoil/standard.asp
P.S. Remember to make sure that the heli-coil thread at the opening (where you would start the install of the spark plug) is just below the surface so that it is less likely for you to accidently pull the heli-coil out. The heli-coil is essentially a precision spring and if it is too close to the surface, the end of the heli-coil could be pulled out due to lack of support of the tapped heli-coil thread. I hope I'm not confusing you here. Read their website for a better explanation...or call them. It's actually a lot easier than all this sounds. Good luck.
In the free state they are greater in diameter than the tapped hole into which they are installed. In the assembly operation the torque applied to the tang reduces the diameter of the leading coil and permits it to enter the tapped thread. When the torque or rotation is stopped, the coils expand with a spring-like action anchoring the insert permanently in place against the tapped hole. No staking, locking, swaging, keying, nor interference fit is required to retain HELI-COIL Inserts, thereby eliminating stress concentration in the parent material. The HELI COIL Insert automatically adjusts itself, radially and axially, to any expansion or contraction of the parent material.
http://www.emhart.com/products/helicoil/standard.asp
P.S. Remember to make sure that the heli-coil thread at the opening (where you would start the install of the spark plug) is just below the surface so that it is less likely for you to accidently pull the heli-coil out. The heli-coil is essentially a precision spring and if it is too close to the surface, the end of the heli-coil could be pulled out due to lack of support of the tapped heli-coil thread. I hope I'm not confusing you here. Read their website for a better explanation...or call them. It's actually a lot easier than all this sounds. Good luck.
Last edited by mopardave; Oct 12, 2008 at 08:52 PM.
I have used heli-coils for a lot of things, but I do not believe I would try it on a sparkplug, head bolt, or any other use where the compression of an engine would or could effect it, but that is just me.
Outstanding HDF Member
Joined: Jun 2005
Posts: 3,238
Likes: 0
From: Desmoines, Iowa
i have used them back when i raced. they work good you should be fine. but you know you got to pull the head so shaving's dont get in the motor.
Trending Topics
Elite HDF Member
Joined: Sep 2006
Posts: 3,592
Likes: 6
From: Florida
There is no problem using heli-coils for spark plugs. they are actually far stronger than the aluminum threads that were tapped into the head.
You are better off pulling the head to do the job, but you don't have to. I have installed them on car engines by using a strong air vac while tapping the hole. The trick to it is to make sure that the exhaust valve is open so that the vac can actually suck air and debris up and out of the plug hole. When you are finished installing the heli-coil, if you are confident that a minimum of chips have fallen in, you can crank the engine over with the coil disconnected and the spark plug still removed. This will blow any possible remaining debris out of the cylinder.
I know this method works because I have done it, but the only way to be absolutely sure that shavings don't drop in is to pull the head for the work. It's up to you.
Good luck, Dave
You are better off pulling the head to do the job, but you don't have to. I have installed them on car engines by using a strong air vac while tapping the hole. The trick to it is to make sure that the exhaust valve is open so that the vac can actually suck air and debris up and out of the plug hole. When you are finished installing the heli-coil, if you are confident that a minimum of chips have fallen in, you can crank the engine over with the coil disconnected and the spark plug still removed. This will blow any possible remaining debris out of the cylinder.
I know this method works because I have done it, but the only way to be absolutely sure that shavings don't drop in is to pull the head for the work. It's up to you.
Good luck, Dave
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
