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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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