Spent the past few days going over this B I got recently. Found that the lever on the steering column that controls the radiator shutter was jammed. The early Bs were "all fuel" tractors--had a small gasoline tank for starting and a larger "distillate" tank for extended running. You can read about it here
TractorData.com - Tractor fuels
Fuel economy with distillate required the engine temperature to be kept in the 180F range, hence the shutter to control air flow through the radiator.
I removed the shutter assembly and soaked the top and bottom ends of the shutter blinds in several gallons of WD-40 for a few days. It worked--I was able to free up the bottom ends of the blinds where all the rust was located.
<img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=279838"/><img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=279839"/><img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=279840"/><img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=279841"/>
Applied a little white grease to the shutter mechanism--we'll see how well that stuff works after a year or so. Also sprayed the shuttle control lever/linkage on the steering column with PB Blaster to soak into the surface rust and eliminate the friction problem that was making the lever hard to operate.
Next order of business--check out the PowerTrol unit and build a 3-point hitch for the B.
Funn stuff:thumbsup: