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Stumbled onto your forum because of my infatuation with the Farmall Letter series tractors, mainly the Farmall H. Back in the late forties my brother owned a Farmall B that had an exhaust lift. Seeing that term again reminded me that it was one of the all time bad ideas. We had tons of problems with the exhaust lift system, even when the tractor was new. The big cylinder constantly leaked down, requiring replenishment of the gases ever few minutes. Part of this might be due to the fact that the trapped exhaust gas cooled, and this would reduce the pressure. This was especially bothersome when transporting from home to field or vice versa. The clapper that clamped down on the exhaust port when the lift lever was activated (pulled) and ostensibly forced hot gases into the cylinder never worked properly. It allowed so much blow-by that the lift worked extremely slow. We tried inserting various types of plates between the solid gas gate or flap (for want of a better word) and the exhaust seat that it closed onto, hoping it would provide a better seal. Heat and pressures made quick work of an asbestos one that, after a few actuations of working quite well, suddenly exited the muffler in a thousand small bits and pieces. We finally got the best results with a solid gasket cut from a tin can and pounded as flat as we could make it. When the engine was running in idle, the tin gasket bounced around in the exhaust stream between the seat and the gas gate, emitting a rattling, tinkling sound.
I had forgotten about that equipment until tonight when I saw the term "exhaust lift". Anyway, I apologize for getting way off subject.
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