I think I'm getting a little exhaust leak around my spark plugs. I washed the car this weekend and then started it. I saw lots if bubbles where the water had pooled around the plugs, and I'm pretty sure I saw exhaust coming from around them.
I'm guessing this could result is a loss of power, correct? Maybe one of the issues I have with pulling hills?
Is there any sealant I can use to correct this?
I have heard some recommend wrapping aluminum foil around the threads. I put a couple turns of teflon tape around mine and it seems to work fine. Apparently the pipe threads cut through the tape enough to provide a good ground.
If you use teflon tape, it acts somewhat as a thread lubricant, so don't go crazy with the wrench tightening the plugs down.
I use Aircraft Permatex sealant. Works great, you do not need to over tighten using Permatex. Removing and installing a new spark plug is no problem, just add a small amount when putting in the new plug. NAPA has it in their brand.
If the leak is difficult to stop you might try a small dot of solder on the threads. Clean, flux and a dot just enough to run around the threads. I had a head with rusty threads and this method worked well.
Here are a bunch of ideas from this forum:
Some folks don't worry about it and some go as far as retapping the head.
Plain old pipe thread dope works fine, a small tube in your tool box will last you a lifetime. KGB
Copperslip or thread paste works great. .. had the same problem. . Too much teflon tape and you will have spark problems. .
Hope this helps