Feedback Score: 0 reviews
Join Date: Oct 2014
Location: Lincoln, ne
My 400 service manual says nothing. Google search turned up a few sources that said they are sort of alignment marks, but only in the sense that you want to maintain the original alignment of existing parts, like if both dots face out, reinstall with both dots out. If one dot faces in and the other out, reinstall the same way.
This is because the gears wear together and if you reverse one after disassembly, the fit will be compromised and probably not be as efficient and wear faster. Maybe similar to installing a drive chain sprocket in reverse after it has wear, the engagement of sprocket and chain will not be the same.
In this case, because you are replacing both and the dots of the new assembly are on the same side, I would install them with the dots on the same side. I am guessing you will have both facing outward.