Quote:
Originally Posted by rotorwrench
They were not intended to exit the bearing surface. They always need to fall short of the edges or unnecessary leak down will result. They best lubricate the bearing if they are confined to the bearing surface only. There is enough leakage out the ends without adding more easy pathways.
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On the Model B rear main, Ford made the oil grooves in the form of an "X" and extended the grooves to the forward end and down the thrust face, thus creating an open pathway to the sump. I wonder if this was because the bearing was now pressurized, albeit at a low pressure.
I have only seen this on original engines produced by Ford. Subsequently rebuilt engines had bearing grooves cut in the manner of the Model A bearings. Some rebuilders even did away with the grooves altogether but retained the wells at the parting line.