Home › Forum › Ask A Member › 1958 Lark 35 › Re: 1958 Lark 35
As for the plug I have used that solid style insert. You are correct in that it is not like a heli coil that is flexible but is a solid threaded sleeve. This is a type of repair for spark plug holes. Some kits even come with a special tap that starts the same size as the 14mm spark plug the tapers to the oversize thread for the repair sleeve….it eliminates drilling and centers the hole. The insert depending on the type is either made to be preened in (usually has a knurled area under the sp) or loc tited in. They are made in different lengths for heads and can be purchased at advance auto, autozone etc on the tool aisle. I have had one or two stick to the sp and back out.
You can try heating it with a torch if the Lottie is holding it on or just replace it with a new one.
As for the pump issues, sounds like the rubber is something to chase down for sure but if that does not work run it without the t stat installed…..leaving all the stuff under it in place. I actually run my 1958 35 w/o the t stat all the time as I had one of the rare fail closed situations and decided to go without. I am in hot weather and hot water so I really do not run cold, even in the winter. There are arguments on both sides of that issue and I am not wanting to start a debate, but it may help you rule out something in your search. Good luck I love those models.