Home › Forum › Ask A Member › 1963 Sportwin O-Ring on Upper Crank Bearing? › Re: 1963 Sportwin O-Ring on Upper Crank Bearing?
December 23, 2017 at 4:34 pm
#68916
OK, good question indeed….
This engine may indeed use the same goofy oil return system that is on some of the FD/RD engines…Although there is a groove for the oring, please do not use one (at least for now until we have figure out your engine). Look for a vertical groove with a hole in it facing forward in the crankcase cavity where the upper bearing resides (post pictures if you are unsure). Adding the oring to a crankcase with this strange recirculation design will plug it up and actually cause oil to puddle/spray up into the mag plate….