So I've been pondering the best way to plug the holes left in the exhaust manifolds on my Scramblers 360. That motor came out of an 83 waggy so I think it applies here. If not, someone tell me and I'll delete the thread.
Having removed and plugged the manifolds on our wagoneer, I wasn't particularly happy at how it went. I used some grade 8 bolts and had to stack washers since the holes don't have enough room in them for the shortest bolt (1") I could find that was 9/16 18. Seemed kinda butch but it did work.
So now that I am de-emmissioning my scrambler as well, I wanted something less hack looking.
A couple days ago I started by tackling trying to get the AIR tubes off. Since the bolts are hollow and the motor isn't exactly new, it is challenging. Of the 7 bolts, 5 came out with hardly any issue. Two, however, broke off in place. It's not surprising and I expected it but it still sucks.
Tomorrow I will try and tackle getting what remains out. They've been soaking in penatrant for a while but I expect I'll have to apply heat to get em free. Nature of the beast.
So how do I plan on plugging the holes? We'll, on a trip to Orileys I got to looking around. What I found that I believe will work was a little unexpected. See, the problem (to me anyhow) is that it's nearly impossible to find a really short 9/16 bolt (+/- 5/8") with fine thread 18. Nothing I looked at around town worked. Either they were course bolts or too long. As the factory bolt goes in it has a taper. That taper creates a seal to keep the exhaust going where it should, into the AIR tubes. Unfortunately it means the plug has to be less than an inch to keep from bottoming out. If you try to force it you will likely crack the manifold which is a whole different issue.
So, wandering around I stumbled on these:
Correct diameter, right thread pitch, and shorter than an inch (.377).
So tomorrow I hope to be able to test them out and report back what I find. If they work, ill let y'all know. Maybe this is the solution I've been looking for.