I've gotten back into my A/B parts book. For the A it shows a plug for the A. For the Bs and BNs it shows a 45-degree street elbow (male one end, female on the other) that runs down and to the left from the inlet casting, and then the vertical nipple and cap. The front castings are different between the two tractors and maybe that's the reason for it.
Still, there will be a hole somewhere in the bottom of your casting for the coolant to drain after it comes out from the plug. If the B/BN setup doesn't line up with or reach the hole you have, there MIGHT be room to start with a 45 or 90 street elbow and use a second 45 or 90 regular elbow with a shorter nipple between them (again, all common hardware items) to reach the hole before going vertical with a shorter nipple down to the cap.
My apologies for being so vague and rambling on. The nearest A I can get to is my neighbor's but it's a matter just now of fifty yards of three-foot-deep snow, with a six-foot snowpile about halfway through that to get over for a look. And it will be of limited use at the moment because the motor is out of it so i can't eyeball/gauge the alignment between the drain on the inlet and the hole through the front casting . . . 8^(
Sorry, too, if I've just confused the issue. Please don't hesitate to come back for clarification and let us know how you make out.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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