Post by Deleted on Apr 8, 2015 10:11:11 GMT -5
After observing a lot of blow-by past the correctly sized fitting while performing the compression test, I determined that the threads in the port were damaged. I researched this type of repair and ordered a kit from my buddies at NAPA. This morning I picked up this kit (see picture) and, after careful measurement and mark-up, the whole procedure took less than an hour. I did not have to remove the head either! The length I needed to thread was within the length of the tool. I liberally greased the tap and being self-guiding (the tip is 14mm), it started out smooth, got a bit tight going past the damaged area but then got progressively easier. I did it in three passes, pulling and cleaning the tap then reapplying more grease. When finished, I cleaned the area completely and used Q-tips to clean in the combustion chamber. All I found in there was a little grease from the tip of the tap. One of the included inserts was correct for the Autolite 295's I use so I threaded an old plug with the insert, applied a liberal amount of the High-Temp Copper Sealant, screwed it in to the correct depth and extracted the plug. Included in the kit is a driver for expanding the top of the insert so that it locks in with the serrations found at the top of the insert. I did that and, according to directions, installed the new plug, correctly gapped of course, torqued it down and at about 10AM tomorrow I'll be able to recheck the compression. Cross your fingers, but I don't think it is rings either. This motor has never been overhauled and does see regular maintenance. If the motor passes, I'll be back to work testing.
