Probably not a lot of people trying to adjust a belt on a Singer 347, but that is where I found myself here recently.
I wanted to make this classic Singer purr but It just wasn't keeping up after I spent several hours cleaning and servicing. The belt was slipping. There didn't appear to be a belt tension adjustment where I thought it should be. Finally, hidden in the bottom of the machine and part of the motor mount was the adjustment!
I think they call this an eccentric screw adjustment. You loosen the screw, turn the washer with the off set hole, and it tightens the belt by moving the motor further away from the hand wheel.
In this case, the belt was streached too far and beyond the adjustment of this machine. I had to put a new belt on anyways. I ended up using a streach belt. They work fine but don't last as long as the original V-belts.
What a great, simple, early zigzag, sewing machine.
Love that color? Classic 50's! and it sews great.
