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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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