Just to be picky and because it's an unusual setup the Field Marshall actually uses a dry crankcase with a separate oil sump. The oil pump meters a fairly small amount of oil to the various places (I believe it has six outputs) and when the oil collects in the bottom of the crankcase it is blown by positive crankcase pressure (piston traveling to the rear) up a tube to the top of the engine. On its way back to the sump it gravity feeds through the oil filter. Also due to the charge air coming through the crankcase a percentage of the oil is drawn in with the air and lost. The result is anyone driving said tractor having a very bad case of the black spots! Sam
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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