RE: How to keep muffler bolts tight
Here is my method of keeping a muffler (exhaust diverter) tight on a G-62. I use Permatex Ultra Copper with no gasket. The mating surfaces should be clean, flat, and lightly sanded. On the bolts I use a flat washer, a split lock washer, and another flat washer. The split lock washer keeps constant tension on the bolt. Finally, I use JB Weld on the bolt threads. Don't worry, if you need to remove the bolts, start the engine up and warm it up good. While hot the JB Weld will break loose.