Well I've got the answer and many of you were right about your ideas and suggestions:thumbsup: accept for Mace Canute who suggested it's where I grease the muffler bearings
Talking to the company that sold me the manifold it appears that since my Massey 35 engine is a Continental gas engine it's the same engine used by other manufacturers including Hyster for their forklifts. Apparently forklifts need "a vacuum advance airline to advance the timing" and that's where it would go. He said that a grease fitting fits and so that's why somebody put it in there but he wouldn't recommend it because the spring or ball bearing might dislodge and drop down into the manifold or carburetor. He said to simply put in a hex bolt or screw instead just like "Argosy" recommended with the steel plug.
Thanks for all the advice on this one. Now I have to try to get the manifold off without breaking any of the studs. I'll be back on this website if I do, to figure out how to deal with that problem:laughing:
Thanks for all the advice on this one. Now I have to try to get the manifold off without breaking any of the studs. I'll be back on this website if I do, to figure out how to deal with that problem:laughing: