Rigdon wrote:
There are multiple possibilities from dirt dauber nest to a loose screw being caught in the flywheel or a fastener vibrating loose.
It could be the swear ridge at the top of the cylinder but only with a worn con-rod or crankshaft.
Not all aluminum cylinders are sleeved just the better ones.
Kback claims the onans are cheaply made but obviously as you pointed out, the better ones are sleeved.. That makes the Onans not so much cheaply made..
Heck, even the bottom rung B&S lawnmower engines are sleeved..
Per
HERE "BRIGGS & STRATTON
Vertical Shaft -Twin - OHV
22 HP - 724CC Intek
MODEL: 44N677-0045
Cast Iron Sleeve, 12 Volt Electric Start, 9 Amp Alternator,
1” Diameter x 3.16” Long Crankshaft,
Dynamically Balanced
Keyed, Drilled and Tapped 7/16-20,
Choke a Matic, Oil Filter, Fuel Pump,"As far as some aluminum engines being not sleeved goes, perhaps a few of the cheep 2 cycles used in say weed whackers and low grade consumer chainsaws..
