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The question should be academic. The tractor drive and the rear PTO come from the flywheel side, front and mid PTO from the shaft side. I believe that Onan only used the one shaft diameter for the BF and B43 engines, although there might be a little difference in length with the Sears being a little longer to accommodate both the drive and PTO pulleys. I don't think it will matter.I am wanting to go back to the onan 16 motor or 18 I have a guy who has a working 16on on an old sears that I am gonna get I just am not sure if the shaft will work because I don't know how long the original shaft would have been. If anybody has ideas or knowledge with the sears onan please let me know it would help me out some.
The question should be academic. The tractor drive and the rear PTO come from the flywheel side, front and mid PTO from the shaft side. I believe that Onan only used the one shaft diameter for the BF and B43 engines, although there might be a little difference in length with the Sears being a little longer to accommodate both the drive and PTO pulleys. I don't think it will matter.
I believe that all the Sears Onans were BF engines, the same as the initial run of MF1655s. The B43s came into being sometime in the second year of 1655 production. I'm guessing that the difference between the crankshaft designations between the Sears and the MF is for the length. I also noted that there is no substitute "P" series engine for the Sears whereas I made a good guess putting the P220 into my 1655.Tudor Very interesting. I think I have read every one of your 3k+ posts and find your word on point.
I did some research for my 1855 an Onan B48G. I found that there were quite a few B48s made with different tapers/sizes and I think the B43s were the same as well. It would be too easy for me to find a Craftsman or other make with an Onan and have a complete match up.
Here is a website to an Onan Cross reference. If you know the exact model of your Onan it tells you specifics...
http://www.smallenginewarehouse.com/onanxref.asp
Kyle