This older, shorter belt would be so I can eliminate the alternator altogether for my test-run stand? I think I get it. The water pump turns so easily, even a loose belt would turn it.... I wonder if I could stretch a rubber snow chain snubber around it. Dang, it's worth a try! Wednesday night is when my wife is on the other end of the island doing her 24 hour eldercare shift so I rarely come in from the shop before midnight. I have the radiator on and all plumbed and the fan on. Cooling system is full (just water for now, pets and all) and just a little weeping fixed by re-tightening hose clamps. I have been running it for ten minutes at a time with no positive circulation but the thermostat has opened and head hasn't gotten hotter than 185, top rad tank about 160, bottom thank about 80. Some of the earlier John Deere tractors had no water pump at all. The system was a thermo siphon circulating through the radiator. I'm thinking they musta had a fan though. Just keeping my eye on the magic thermometer gun, but heading back out to find a short belt or a chain snubber.