farmer in the (WI) dells
Member
I finally got to my 47 Allis B after it sat for the winter. I needed to replace a spindle on my Woods belly mower so it sat since putting it away last fall. I only use it for mowing. In the spring I noticed it froze the radiator so I pulled it to see if I could have it repaired. It was too far gone so I put in a new Chinese version. I also noticed the thermostat housing cracked and replaced that and the thermostat. I did put in a new water pump last season so this all should take care of the entire cooling system. She started up as usual and I mowed for 10-15 minutes when the rpms dropped, she knocked a bit, then quit. I was just outside the yard so I was going to get my truck to pull it back in and got distracted so she sat for 45 minutes or more. When I went back to it, she started right up so I got her back in the yard and mowed around close for awhile. After 15 minutes or so she did the same thing, almost sounding like it was locking up. I did look at the temps and oil pressure this time and temps never made it to the normal range so it didn"t overheat. My oil pressure was right where it has been for years. I recently changed it and it is clear and clean. You can read through it. I spoke with my tractor repair man who said he never heard of this happening because once it starts knocking, like a bearing spun, I should lose oil pressure ad the knock should still be there on start up, which it is not. It doesn"t come back for 10-15 minutes of mowing after a cool down. He said it could be a coil in the mag getting hot. I should add that it is still 6 volts and has a magneto. Would that cause a knock? What happened? Where should I begin?