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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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