I must be missing something simple but I am reading the procedure for adjusting the timing. I have read you should only set the tension on a belt once. I understand that in order to adjust the timing in small increments it may require combinations of changing the dowel pin and/or moving the gear. How do you move the gear while the belt is under tension?
You're misreading that a little (and trying to live too pure a life ). The instruction is really meant to mean "don't set the tension, then operate the engine, then reset the tension" -- as long as you don't operate the engine, it's fairly safe to install/remove/reinstall the belt a few times to get the cam-to-crankshaft relationship set-up.
You won't need it John, and the various angles are different for 348 vs 308 (nor will you have to take the belt off and skip teeth). They added a bunch more holes to both the cam sprockets and the camshaft hubs on the 348 (see page B66 in the 348 WSM) - so a pair of holes should always quasi-line up within a resolution 0.75 deg (regardless of the belt to sprocket relationship). Guess they (rightly) figured that having 4 sprockets and only 1 belt would be way too hard to be done like a 308, and it was worth the cost of adding more holes .
Well the cam has a land that sticks out. The cog fits into the land. You can pull the pin and take the bolt out and the cog will spin but not fall off...that's how. Think about how your hubcentric wheel stays on even if you don't have studs sticking out.
