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Why this etching
Posted: Tue Dec 14, 2021 2:30 pm
by Adobejoe
I finally have the large gear removed and can put in the new Babbitt and reinsert gear. It took a bit of solvent, three gear puller and gently tapping but it did slide off. I did not want to crack this bugger. Anyway I noticed the stipple marks and curious why there? Anything
5A0CD958-679B-4502-A937-98A7F5FE0B15.jpeg
beside sanding with some 200 grit before I reassemble?
Andy
Re: Why this etching
Posted: Tue Dec 14, 2021 2:46 pm
by windybob
When you use a punch like that, it raises the metal slightly. Helps the shaft fit tighter in the gear.
Re: Why this etching
Posted: Tue Dec 14, 2021 5:32 pm
by mtblah
My father once did that to an engine piston hoping to close some of the gap from a worn out cylinder.
Re: Why this etching
Posted: Tue Dec 14, 2021 5:45 pm
by Adobejoe
Yeah, I have never seen anything like this. There is the through pin that keeps all in line, but this must be extra tightness is all I can imagine. Must of been done at factory, on the Babbitt replacement I saw somewhere to cut a groove with hacksaw blade for lubrication….yes or no? Mt blah, wow interesting!