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Originally Posted by stevebfl
MAS? The posts terminology sure fails me but I'm pretty sure he is talking about the break-away bolts on the tamperproof mixture adjustment tower.
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Aha, that would make sense because I sure can't see anyway to remove them without actually shearing off the tops. Interestingly enough, the replacement comes with torx head screws to support it's installation.
If you look at the picture attached to my longish post you'll see the middle tower in cross section, that's the one I'm talking about. Your actual name for it seems appropriate.
I would guess then if I actually were to decide to replace the "mixture adjustment tower", since it comes with break-away bolts and not torx headed screws, I would have a much more complex task than I ever want to tackle in a home workshop.
So, lets go back to the first question. Take a look at the attached. My parts book shows a part #47 what looks to be a rubber bushing/grommet/whatever that appears have a hole through it lengthwise, to sit at the top of that little tower. I expect it's initial puppose was to close off the space between the bottom of the air cleaner and the top of the tower, so that the only air reaching the tower came down from above the air cleaner, and the heated air which passed over the engine and below the air cleaner could not.
But, when I order that part #47, a little ball bearing is delivered, instead of the item pictured. That ball bearing will fit fully in the depressed opening at the top of the tower. But is it needed? What keeps it from bouncing out?
Right now no ball bearing is in place and with the air cleaner off I have an unobstructed view down into the center of the tower. Should I go back to the MBZ parts shop and buy the ball bearing and "install it" or just leave well enough alone?
chuck