Going back & looking at pic's you have in orig post I now suspect tractor a 416-8 which was made 85-92,the 516h was only made for 1 yr(88),the dash support,dash & hood were probably a transplant from a 516h,this being said after doing some checking at partstree & toro websites the drive belt,trans pulley & belt covers are different pn's between the 416 & 516h,for a 416 the belt is 82"x5/8",for the 516h the belt is 83"x5/8",as far as actual diam of trans pulley this is something you'll have to try & find out,possibly one of the other guys with a 416 or 516 can measure their pulley & let you know diam of same,belt covers appear to be the same in assembly drawings for each tractor.
In last group of pics you posted in 2nd one rod by eng pulley with belt laying on it,the rod is just a guide to feed belt into cover,although on some mod tractors this can be adjusted to change spaceing between belt & pulley,you need owners manual to check this out.
If this tractor is a 416 if you look at arm that idler pulley is mounted you'll see a tab guide on arm,depending on angle of arm this tab serves a dual function,it keeps belt from jumping off idler pulley and as angle of arm changes when depressing clutch pedal acts as a friction brake for belt by rubbing on back side of belt & also stops belt from kicking back after it has moved forward to disengage eng pulley.If drive belt wrong size or trans pulley changed it's going to take some time/money to get problem sorted out & get clutch back to where it should be to operate correctly.If you're on speaking terms with previous owner find out if he changed trans pulley or eng pulley.
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