Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Well that sucks.  Just thinking since the crank is single ended, we would drain oil, remove oil pan, remove flywheel, partially remove crankshaft bearing housing, taking crankshaft with, until the crank pin is free of the rod big end, and if you feel froggy, chase through the dipper hole, through the bushing.  Ought to get away without pulling the gear case and crank auxiliary side, if you can drill the bushing with the piston and rod in the bore.  If you get away with it, then I’d just blast away with WD40 as a rinse, and slap it back together. If you don’t disturb the gear case, timing remains intact, etc. you’re simply plugging the crank pin into the whole back half. Deburring  the hole in the bushing after you drill it might get interesting. Then again, drill with a handheld pin vise, and you can control breakthrough and not leave a burr worth worrying about.