I went to change the plugs on my 4.0 for the first time and found that the old #6 plug was cross-threaded by the prior owner. Doh.
I used a thread chaser to "clean" the #6 hole, and now the new spark plug holds the specified torque.
The problem is that the #6 plug hole now allows a small amount of exhaust gas blow-by. I can't even smell it in the engine bay unless I put my nose right by the #6 hole. It creates a faint smell in the cabin at stoplights when the climate control fan is on, which annoys my wife.
Any suggestions? I've already tried re-seating the plug and using a different plug. No change. I don't want to do a heli-coil because the plug actually holds torque just fine, and there's no guarantee the heli-coil will hold long-term.
So far I've read about coating the threads in teflon tape (it melts), anti-seize lube (probably a bad sealant), and RTV (?). Help!
Thanks,
Dave
I used a thread chaser to "clean" the #6 hole, and now the new spark plug holds the specified torque.
The problem is that the #6 plug hole now allows a small amount of exhaust gas blow-by. I can't even smell it in the engine bay unless I put my nose right by the #6 hole. It creates a faint smell in the cabin at stoplights when the climate control fan is on, which annoys my wife.
Any suggestions? I've already tried re-seating the plug and using a different plug. No change. I don't want to do a heli-coil because the plug actually holds torque just fine, and there's no guarantee the heli-coil will hold long-term.
So far I've read about coating the threads in teflon tape (it melts), anti-seize lube (probably a bad sealant), and RTV (?). Help!
Thanks,
Dave