There were a few engines made with no rear main seal.
I worked at a marina right out of high school, we would get new boats in, sometimes they would stand them on end to get more on the trailer. The Volvo I/O would dump oil out the rear main, because there was no seal, only a slinger. Clean up the mess, put oil back in, not a drop would leak!
One place I worked had a Ford delivery truck with a 351W. One day it started dumping oil out the rear main. It had always had a very small drip, but suddenly it was pouring! I pulled the engine expecting the worse, instead I found there was no lower half of the seal in the main cap, left out at the factory! What happened was the spring in the PCV valve collapsed, pressurizing the crankcase.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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