Yes, I've been suspecting the low cranking voltage. Before when I had the OEM low-ohm, so-called "6 volt" coil - cranking at 8 volts was not an issue. A 6 volt coil is very happy with 8 volts. Now - with the 3.3 ohm so-called "12 volt" coil - maybe it IS an issue.
This crawler was in a fire 20 years ago. I've long suspected a slight field-coil problem in the starter. It's never sounded quite "right." 20 years ago I put new brushes, holders, starter drive and solenoid in it and it's worked good enough ever since. But since battery voltage drops to 8 volts , I'm wondering if it draws more then it should. 1010/2010 gas starters are not common and nothing else I know of fits - so I've never come across another. On the other hand -for my Deere 1020 diesel - I just bought a brand new gear-reduction starter for $95, tax free, no shipping charges. Hard to beat that price for a brand new starter (not rebuilt). But the 1010/2010 series is odd-ball and no aftermarket starters around. I don't even know if I can buy field coils for the Delco that's in the 1010. Maybe I'm going to have to check sometime. I know a diesel tractor with the correct batteries and cables is supposed to drop to 9 to 9.5 volts when cranking. So, 8 volts in this gasser sounds like an excessive drop. I've checked battery voltage directly at the battery so I know cable or connections are not to blame. It would have to be a defective/undersized battery or a starter drawing too much current. Or I guess, and engine turning too hard which I know is not the issue.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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