The thermo-viscous-clutch fan shouldn't be running at pulley speed unless the motor is hot. Does it sound like a jet engine when you rev it cold? Bad fan clutch. Like the one in the 90 Cummins dad and I just bought, I can hear the fan over the motor from a half mile under hard accelration, time for a new fan clutch.
There were two reasons they have that set-up. One is that it runs the fan harder as it heats up. Second is that there is a fluid coupling running the fan, and it saps less engine power than having it coupled solid.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I�m handing him tools and he says, "give me that..." and I�ve already got it in his hand or "hand me that....."and I�ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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